WO2024119496A1 - Communication methods and apparatuses, and device, storage medium, chip, product and program - Google Patents

Abstract

Provided in the embodiments of the present application are communication methods and apparatuses, and a device, a storage medium, a chip, a product and a program. A communication method comprises: according to whether a terminal device supports blind-scheduling retransmission of Msg3 or blind-scheduling retransmission grant monitoring of the Msg3, the terminal device determining a resource and/or preamble for sending Msg1 (S801).

Description

Communication method, device, equipment, storage medium, chip, product and program Technical Field

The embodiments of the present application relate to the field of mobile communication technology, and specifically to a communication method, apparatus, device, storage medium, chip, product and program.

Background technique

The terminal device can support two random access modes, namely: a contention-based random access mode and a non-contention-based random access mode. How the terminal device determines random access resources and/or preambles during random access is a problem that has always been of concern in the art.

Summary of the invention

Embodiments of the present application provide a communication method, apparatus, device, storage medium, chip, product, and program.

In a first aspect, an embodiment of the present application provides a communication method, the method comprising:

The terminal device determines the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of the grant for blind scheduling retransmission of Msg3.

In a second aspect, an embodiment of the present application provides a communication method, the method comprising:

The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1.

In a third aspect, an embodiment of the present application provides a communication device, including:

The determining unit is used to determine the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

In a fourth aspect, an embodiment of the present application provides a communication device, including:

The determination unit is used to determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1.

In a fifth aspect, an embodiment of the present application provides a communication device, including: a processor and a memory,

The memory is used to store computer programs.

The processor is used to call and run the computer program stored in the memory, so that the terminal device executes the method described in the first aspect or the network device executes the method described in the second aspect.

In a sixth aspect, an embodiment of the present application provides a computer storage medium, wherein the computer storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method described in the first aspect or the second aspect.

In a seventh aspect, an embodiment of the present application provides a chip, comprising: a processor, configured to call and run a computer program from a memory to execute the method described in the first aspect or the second aspect.

In an eighth aspect, an embodiment of the present application provides a computer program product, the computer program product comprising a computer storage medium, the computer storage medium storing a computer program, the computer program comprising instructions executable by at least one processor, and the method described in the first aspect or the second aspect is implemented when the instructions are executed by the at least one processor.

In a ninth aspect, an embodiment of the present application provides a computer program, which enables a computer to execute the method described in the first aspect or the second aspect.

In an embodiment of the present application, the terminal device determines the resources and/or preamble used to send Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3. In this way, the terminal device can indicate to the network device whether it supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3 through the set resources and/or preamble, which is conducive to the network device to make scheduling decisions according to the terminal device's support for blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3, thereby facilitating the improvement of the efficiency of resource scheduling of the network device.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a schematic diagram of an application scenario of an embodiment of the present application;

FIG2 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

FIG3 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application;

FIG4 is a schematic diagram of an NTN scenario based on a transparent transmission satellite provided in an embodiment of the present application;

FIG5 is a schematic diagram of an NTN scenario based on a regenerative forwarding satellite provided in an embodiment of the present application;

FIG6 is a schematic diagram of a flow chart of a contention-based random access process provided in an embodiment of the present application;

FIG7 is a schematic diagram of a flow chart of a non-contention-based random access process provided in an embodiment of the present application;

FIG8 is a flow chart of a communication method provided in an embodiment of the present application;

FIG9 is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application;

FIG10 is a schematic diagram of a flow chart of another communication method provided in an embodiment of the present application;

FIG11 is a flow chart of another communication method provided in an embodiment of the present application;

FIG12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG13 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application;

FIG14 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

FIG. 15 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. The technical solutions recorded in the embodiments of the present application can be combined arbitrarily without conflict. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited. In the embodiments of the present application, "information" and "message" can be understood in the same way unless otherwise specified. In the embodiments of the present application, "the method also includes" can represent a supplement to the method in any of the above embodiments, or it can be an embodiment of a separate communication method.

FIG1 is a schematic diagram of an application scenario of an embodiment of the present application. As shown in FIG1 , a communication system 100 may include a terminal device 110 and a network device 120. The network device 120 may communicate with the terminal device 110 via an air interface. The terminal device 110 and the network device 120 support multi-service transmission.

It should be understood that the embodiments of the present application are only exemplified by the communication system 100, but the embodiments of the present application are not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Internet of Things (IoT) system, Narrow Band Internet of Things (NB-IoT) system, enhanced Machine-Type Communications (eMTC) system, 5G communication system (also called New Radio (NR) communication system), or future communication systems (such as 6G, 7G and other communication systems), etc.

In the communication system 100 shown in Fig. 1, the network device 120 may include an access network device 121 that communicates with the terminal device 110. The access network device 121 may provide communication coverage for a specific geographical area, and may communicate with the terminal device 110 located in the coverage area.

The terminal device in this application can be a device with wireless communication function, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.). The terminal device in this application can be called user equipment (User Equipment, UE), mobile station (Mobile Station, MS), mobile terminal (Mobile Terminal, MT), user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device. The terminal device may include one of the following or a combination of at least two: Internet of Things (IoT) devices, satellite terminals, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, servers, mobile phones, tablet computers (Pad), computers with wireless transceiver functions, PDAs, desktop computers, personal digital assistants, portable media players, smart speakers, navigation devices, smart watches, smart glasses, smart necklaces and other wearable devices, pedometers, digital TVs, Virtual Reality (VR) terminal devices, Augmented Reality (Augmented Reality) terminal devices. The wireless terminals include augmented reality (AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, as well as vehicles, on-board equipment, on-board modules, wireless modems, handheld devices, customer premises equipment (CPE), and smart home appliances in the Internet of Vehicles system.

The network device 120 in the embodiment of the present application may include an access network device 121 and/or a core network device 122 .

The access network equipment 121 may include one of the following or a combination of at least two: Evolutional Node B (eNB or eNodeB) in Long Term Evolution (LTE) system, Next Generation Radio Access Network (NG RAN) equipment, base station (gNB) in NR system, small cell, micro cell, wireless controller in Cloud Radio Access Network (CRAN), access point of Wireless-Fidelity (Wi-Fi), transmission reception point (TRP), relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network equipment in future evolved Public Land Mobile Network (PLMN), etc.

The core network device 122 may be a 5G core network (5G Core, 5GC) device, and the core network device 122 may include one of the following or a combination of at least two: Access and Mobility Management Function (Access and Mobility Management Function, AMF), Authentication Server Function (Authentication Server Function, AUSF), User Plane Function (User Plane Function, UPF), Session Management Function (Session Management Function, SMF), Location Management Function (Location Management Function, LMF). In other embodiments, the core network device may also be an Evolved Packet Core (EPC) device of an LTE network, for example, a Session Management Function + Core Packet Gateway (SMF + PGW-C) device of a core network. It should be understood that SMF + PGW-C can simultaneously implement the functions that can be implemented by SMF and PGW-C. During the network evolution process, the core network device 122 may also be called other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited in the embodiments of the present application.

The terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wireless connection.

The terminal device 110 can be used for device to device (Device to Device, D2D) communication.

The various functional units in the communication system 100 can also establish connections and achieve communication through the next generation network (NG) interface.

For example, the terminal device establishes an air interface connection with the access network device through the NR interface for transmitting user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); the access network device, such as the next generation wireless access base station (gNB), can establish a user plane data connection with the UPF through the NG interface 3 (N3 for short); the access network device can establish a control plane signaling connection with the AMF through the NG interface 2 (N2 for short); the UPF can establish a control plane signaling connection with the SMF through the NG interface 4 (N4 for short); the UPF can exchange user plane data with the data network through the NG interface 6 (N6 for short); the AMF can establish a control plane signaling connection with the SMF through the NG interface 11 (N11 for short); the SMF can establish a control plane signaling connection with the PCF through the NG interface 7 (N7 for short).

Figure 1 exemplarily shows a base station, a core network device and two terminal devices. In some embodiments, the wireless communication system 100 may include multiple base station devices and each base station may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

3GPP is studying the technology of non-terrestrial network equipment (NTN). NTN generally uses satellite communication to provide communication services to ground users. Compared with ground cellular network communication, satellite communication has many unique advantages. First, satellite communication is not limited by the user's geographical location. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be set up or where communication coverage is not provided due to sparse population. For satellite communication, since one satellite can cover a large area and satellites can orbit around the earth, in theory every corner of the earth can be covered by satellite communication. Secondly, satellite communication has great social value. Satellite communication can cover remote mountainous areas, poor and backward countries or regions at a low cost, so that people in these areas can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital divide with developed areas and promoting the development of these areas. Thirdly, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases; finally, satellite communication has high stability and is not limited by natural disasters. Optionally, the network equipment in NTN can include satellites.

NTN technology can be combined with various communication systems. For example, NTN technology can be combined with NR system to form NR-NTN system. For another example, NTN technology can be combined with Internet of Things (IoT) system to form IoT-NTN system. As an example, IoT-NTN system can include NB-IoT-NTN system and eMTC-NTN system.

FIG2 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application. As shown in FIG2 , a terminal device 201 and a satellite 202 are included, and wireless communication can be performed between the terminal device 201 and the satellite 202. The network formed between the terminal device 201 and the satellite 202 can also be referred to as an NTN. In the architecture of the communication system shown in FIG2 , the satellite 202 can have the function of a base station, and the terminal device 201 and the satellite 202 can communicate directly. Under the system architecture, the satellite 202 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 202 may be included in the communication system, and each network device 202 may include other number of terminal devices within its coverage range, which is not limited in the embodiments of the present application.

FIG3 is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application. As shown in FIG3 , it includes a terminal device 301, a satellite 302 and a base station 303. Wireless communication can be performed between the terminal device 301 and the satellite 302, and communication can be performed between the satellite 302 and the base station 303. The network formed between the terminal device 301, the satellite 302 and the base station 303 can also be referred to as an NTN. In the architecture of the communication system shown in FIG3 , the satellite 302 may not have the function of a base station, and the communication between the terminal device 301 and the base station 303 needs to be transferred through the satellite 302. Under this system architecture, the base station 303 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 303 may be included in the communication system, and the coverage range of each network device 303 may include other number of terminal devices, which is not limited in the embodiment of the present application. The network device 303 may be the network device 120 in FIG1 .

It should be understood that the satellite 202 or the satellite 302 includes, but is not limited to, a low-Earth orbit (LEO) satellite, a medium-Earth orbit (MEO) satellite, a geostationary Earth Orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. A satellite can use multiple beams to cover the ground. For example, a satellite can form dozens or even hundreds of beams to cover the ground. In other words, a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers to ensure satellite coverage and improve the system capacity of the entire satellite communication system.

As an example, the altitude range of LEO satellites can be 500 km to 1500 km, the corresponding orbital period can be about 1.5 hours to 2 hours, the signal propagation delay of single-hop communication between users can generally be less than 20 milliseconds, the maximum satellite visibility time can be 20 minutes, the signal propagation distance of LEO satellites is short and the link loss is small, and the transmission power requirements of terminal equipment are not high. The orbital altitude of GEO satellites can be 35786 km, the rotation period around the earth can be 24 hours, and the signal propagation delay of single-hop communication between users can generally be 250 milliseconds.

In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

It should be noted that FIGS. 1 to 3 are only examples of the systems to which the present application is applicable. Of course, the methods shown in the embodiments of the present application can also be applied to other systems. In addition, the terms "system" and "network" are often used interchangeably in this article. The term "and/or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the associated objects before and after are in an "or" relationship. It should also be understood that the "indication" mentioned in the embodiments of the present application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, B can be obtained through C; it can also mean that A and B have an association relationship. It should also be understood that the "correspondence" mentioned in the embodiments of the present application can mean that there is a direct or indirect correspondence relationship between the two, or it can mean that there is an association relationship between the two, or it can mean that there is an indication and being indicated, configuration and being configured, etc. It should also be understood that the "predefined", "protocol agreed", "predetermined" or "predefined rules" mentioned in the embodiments of the present application can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), and the present application does not limit its specific implementation method. For example, predefined may refer to the definition in the protocol. It should also be understood that in the embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, such as LTE protocols, NR protocols, and related protocols used in future communication systems, and the present application does not limit this.

Satellites can be divided into two types based on the functions they provide: transparent payload and regenerative payload. For transparent payload satellites, they only provide wireless frequency filtering, frequency conversion and amplification functions, and only provide transparent forwarding of signals without changing the waveform signal they forward. For regenerative payload satellites, in addition to providing wireless frequency filtering, frequency conversion and amplification functions, they can also provide demodulation/decoding, routing/conversion, encoding/modulation functions, and have some or all of the functions of a base station.

In the NTN, one or more gateways may be included for communication between satellites and terminal devices.

FIG4 is a schematic diagram of an NTN scenario based on a transparent forwarding satellite provided in an embodiment of the present application, and FIG5 is a schematic diagram of an NTN scenario based on a regenerative forwarding satellite provided in an embodiment of the present application.

As shown in FIG4 , for an NTN scenario based on a transparent forwarding satellite (also called a network device), where transparent forwarding can also be called transparent forwarding (transparent payload), the NTN gateway and the satellite communicate through a feeder link, and the satellite and the terminal device can communicate through a service link. The terminal device and the satellite, the satellite and the NTN gateway, and the NTN gateway and the gNB can communicate through the NR Uu interface. The gNB and the 5G Core Network (5G CN) can communicate through the NG interface. The 5G core network and the data network can communicate through the N6 interface. In the embodiment shown in FIG4 , the satellite and the NTN gateway can belong to a remote wireless unit.

As shown in Figure 5, for the NTN scenario based on regenerative payload satellites (also known as network devices), the NTN gateway and the satellite communicate through a feeder link, and the satellite and the terminal device can communicate through a service link. The terminal device and the satellite can communicate through the NR Uu interface. The satellite and the NTN gateway, and the NTN gateway and the 5G CN can communicate through the NG interface. The 5G core network and the data network can communicate through the N6 interface. In Figure 5, the NG interface can be on top of the Satellite Radio Interface (SRI).

In Figures 4 and 5, NG-RAN is the next generation radio access network. In Figures 4 and 5, the gateway is used to connect the satellite and the terrestrial public network (such as a data network). The feeder link is used for the communication link between the gateway and the satellite. The service link is used for the communication link between the terminal device and the satellite. The inter-satellite link exists in the regeneration and forwarding network architecture.

To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application.

The random access procedure may be triggered by at least one of the following events:

A wireless connection is established when a terminal device initially accesses: the terminal device changes from the radio resource control idle (RRC_IDLE) state to the radio resource control connected (RRC_CONNECTED) state;

Radio Resource Control (RRC) connection reestablishment process: to allow terminal devices to reestablish wireless connections after a wireless link failure;

Handover: The terminal device needs to establish uplink synchronization with the new cell;

In the RRC_CONNECTED state, downlink (DL) data arrives, and the uplink (UL) is in an out-of-sync state;

In the RRC_CONNECTED state, UL data arrives, and the UL is out of sync or there is no Physical Uplink Control Channel (PUCCH) resource for sending a Scheduling Request (SR);

SR failed;

Synchronous reconfiguration request from RRC;

The terminal device transitions from the radio resource control inactive (RRC_INACTIVE) state to the RRC_CONNECTED state;

Establish time calibration during the Secondary Cell (SCell) addition process;

Request additional system information (System Information, SI);

Beam failure recovery.

In NR, the following two random access methods are mainly supported: contention-based random access method and non-contention-based random access method.

FIG6 is a flow chart of a contention-based random access process provided in an embodiment of the present application. As shown in FIG6 , the contention-based random access process is divided into four steps, and the contention-based random access process may also be referred to as a four-step random access process.

S601. The terminal device sends Msg1 to the network device.

Msg1 includes a Random Access Preamble. The terminal selects a Physical Random Access Channel (PRACH) resource and sends the selected preamble on the selected PRACH. If it is a non-contention-based random access, the PRACH resource and preamble can be specified by the base station. Based on the preamble, the base station can estimate the uplink timing and the grant size required for the terminal device to transmit Msg3.

S602: The network device sends Msg2 to the terminal device.

Msg2 includes a Random Access Response (RAR). After the terminal device sends Msg1, it can open a random access response time window (ra-ResponseWindow) to monitor the physical downlink control channel (PDCCH) scrambled by the Random Access-Radio Network Temporary Identity (RA-RNTI) in this window. Among them, RA-RNTI can be related to the PRACH time-frequency resources used by the terminal device to send Msg1.

Optionally, RA-RNTI is calculated as follows: RA-RNTI = 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id. That is, RA-RNTI is related to the PRACH time-frequency resources used by the UE to send Msg1. Among them, s_id is the index of the first OFDM symbol of the PRACH opportunity (PRACH occasion) (0≤s_id<14), t_id is the index of the first time slot of the PRACH occasion in the system frame (0≤t_id<80), f_id is the index of the PRACH occasion in the frequency domain (0≤f_id<8), and ul_carrier_id is the UL carrier used for preamble transmission (0 represents a normal uplink carrier, and 1 represents a supplementary uplink (SUL) carrier).

After the terminal device successfully receives the RA-RNTI-scrambled PDCCH, it can obtain the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH, which includes the Random Access Response (RAR). The RAR specifically contains the following information:

The RAR subheader contains a back-off indicator (BI), which is used to indicate the back-off time for retransmitting Msg1.

Random Access Preamble IDentifier (RAPID) in RAR: preamble index received in the network response;

The RAR payload contains the Timing Advance Group (TAG), which is used to adjust the uplink timing.

Uplink grant (UL grant): used to schedule uplink resource indication of Msg3;

Temporary Cell-Radio Network Temporary Identifier (TC-RNTI): used to scramble the PDCCH of Msg4 (initial access).

If the terminal device receives a PDCCH scrambled with a random access response-Radio Network Temporary Identifier (RAR-RNTI), and the RAR contains the preamble index sent by itself, the terminal device considers that the random access response has been successfully received.

For non-contention-based random access, the random access process ends after the terminal device successfully receives Msg2. For contention-based random access, after the terminal device successfully receives Msg2, it needs to continue to transmit Msg3 and receive Msg4.

S603. The terminal device transmits Msg3 on the network scheduling resources.

Msg3 includes Scheduled Transmission. Msg3 is mainly used to inform the network what event triggered the Random Access Channel (RACH) process. For example, if it is the initial access random process, the terminal equipment identification (UE ID) and establishment cause (establishment cause) will be carried in Msg3; if it is RRC reconstruction, it will carry the connected terminal equipment identification and establishment cause.

Msg3 supports Hybrid Automatic Repeat reQuest (HARQ) retransmission.

S604. The network sends Msg4 to the terminal device.

Msg4 includes contention resolution. After each Msg3 transmission, the terminal device starts or restarts the random access contention resolution start timer (ra-ContentionResolutionTimer), and monitors the PDCCH scrambled by C-RNTI or TC-RNTI during the operation of the timer.

Msg4 has two functions, one is for contention conflict resolution, and the second is for the network to transmit RRC configuration messages to the terminal device. There are two ways to resolve contention conflicts: one is that if the terminal device carries C-RNTI in Msg3, Msg4 is scheduled with PDCCH scrambled with C-RNTI. The other is that if the terminal device does not carry C-RNTI in Msg3, such as initial access, Msg4 is scheduled with PDCCH scrambled with TC-RNTI. The conflict resolution is that the terminal device receives the PDSCH of Msg4 and matches the service data unit of the common control channel (Common Control Channel Serving Data Unit, CCCH SDU) in the PDSCH.

FIG7 is a flow chart of a non-contention-based random access process provided by an embodiment of the present application. As shown in FIG7 , the non-contention-based random access process is divided into two steps, and the non-contention-based random access process can also be called a two-step random access process. The introduction of the two-step random access process can reduce latency and signaling overhead.

S701. The terminal device sends MsgA to the network device.

MsgA includes Random Access Preamble.

In some embodiments, before S701, the network device may assign a random access preamble (RA Preamble assignment) to the terminal device.

MsgA includes a Random Access Preamble. For example, MsgA in a two-step random access includes a Preamble transmitted on the PRACH and load information (such as PUSCH payload) transmitted on the Physical Uplink Shared Channel (PUSCH).

S702: The network device sends MsgB to the terminal device.

MsgB includes Random Access Response.

After MsgA is transmitted, the terminal device listens for the response (MsgB) from the network side within the configured window. If an indication of successful contention conflict resolution is received from the network, the terminal device ends the random access process.

From the above random access process, it can be seen that the main purpose of random access is to achieve uplink synchronization between the terminal and the cell. During the random access process, the network device can know the time when the terminal sends the preamble based on the RACH time-frequency resources used by the preamble received from the terminal device, and then determine the initial TA of the terminal based on the sending and receiving time of the preamble, and inform the terminal through the RAR.

Coverage has always been one of the main network performances that operators pay attention to. Compared with LTE, 5G operates in a higher frequency band. For example: for FR1, the operating frequency band is 3.5GHz; for FR2 band, the operating frequency band may be as high as 28GHz or 39GHz. The higher the operating frequency band, the greater the path loss experienced by the signal, resulting in a smaller coverage range. Usually the network's transmission power is much greater than the terminal's transmission power, so the uplink coverage faces a more serious coverage limitation problem. In order to solve the above problems, R17 introduced the coverage enhancement project, whose main goal is to study uplink coverage enhancement technologies applicable to FR1 and FR2 under TDD/FDD, including coverage enhancement for PUSCH and coverage enhancement for PUCCH.

For PUSCH, uplink coverage can be improved by using a repeated transmission mechanism. In the R15/R16 standard, the PUSCH transmission of Msg3 during random access does not support repeated transmission. Based on the initial evaluation of R17, most companies believe that the PUSCH transmission of Msg3 is a major bottleneck affecting uplink coverage. For this reason, R17 introduces the repeated transmission mechanism of Msg3 PUSCH, and its working principle is as follows:

The network configures an RSRP threshold for the UE to request repeated transmission of Msg3. The UE determines whether to request repeated transmission of PUSCH of Msg3 based on the RSRP measurement result. When the RSRP measurement value is less than an RSRP threshold, the UE can request repeated transmission of PUSCH of Msg3; otherwise, the UE does not request repeated transmission of Msg3.

Regarding the method in which the UE requests repeated transmission of PUSCH of Msg3, the main method is that the base station configures different PRACH resources/preambles for the UE that requests repeated transmission of PUSCH of Msg3 and the UE that does not request repeated transmission of PUSCH of Msg3. In this way, the base station can know whether the UE requests repeated transmission of PUSCH of Msg3 based on the PRACH resources/preamble used by the UE to transmit Msg1.

The base station learns whether the UE requests repeated transmission of PUSCH of Msg3 based on the PRACH resources/preamble used by the UE to transmit Msg1. For UEs requesting repeated transmission of Msg3 PUSCH, the base station indicates the number of repeated transmissions of Msg3 PUSCH through the PDCCH scrambled by RAR or TC-RNTI.

R17 NTN is simulated, evaluated and designed based on the basic assumption that the mobile terminal antenna gain is 0dBi. However, the actual antenna gain of the mobile terminal may be much lower than 0dBi (for example, -5dBi). In addition, considering that the mobile terminal supports linear polarization, the actual link will have a certain polarization loss (for example, 3dBi). Therefore, one of the research objectives of the R18 NTN work item (WI) is to introduce coverage enhancement technology for mobile terminals.

The Msg3 repetition mechanism introduced in R17 can be used in the NTN system. Since Msg3 repetition is an optional capability of the UE, it means that not all UEs have the capability of Msg3 repetition. Then another way to improve the coverage performance of Msg3 is to use the Msg3 blind scheduling retransmission mechanism. In the TN system, the UE starts the ra-ContentionResolutionTimer immediately after each Msg3 transmission (including initial transmission and HARQ retransmission) is completed, and the UE monitors the PDCCH during the operation of the ra-ContentionResolutionTimer. The UE needs to wait at least one round-trip time (RTT) from sending Msg3 to receiving Msg4. Since the RTT of signal transmission between the base station and the UE in the NTN is much larger than that in the TN, for example, for the GEO scenario, the RTT can be up to 541.46ms. In order to avoid invalid PDCCH monitoring caused by UE starting ra-ContentionResolutionTimer too early, R17 decided to add a delay offset equal to UE-gNB RTT to the start time of ra-ContentionResolutionTimer in NTN based on TN. However, this brings a problem that UE cannot receive the blind scheduling retransmission grant for the initial transmission of Msg3.

If the terminal device can support the reception of the blind scheduling retransmission grant for the initial transmission of Msg3, in order for the terminal device to support this function, the UE needs to be able to receive the blind scheduling retransmission grant for the initial transmission of Msg3, for example, the UE needs to be in the state of monitoring PDCCH. On the one hand, not all UEs in NTN have the ability to receive the blind scheduling retransmission grant for the initial transmission of Msg3 (for example, R17UE does not have this ability), and on the other hand, the UE monitoring the blind scheduling retransmission grant for the initial transmission of Msg3 will increase the power consumption of the terminal. Therefore, it is necessary to design a corresponding mechanism to enable the network to know whether the UE has this capability or whether there is such a demand, so as to assist the base station in making scheduling decisions (such as whether to blindly schedule Msg3 retransmission for the initial transmission of Msg3 of the UE).

To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents. It should be noted that the communication method in the present application can be applied to an NTN network, or can be applied to a TN network.

In an embodiment of the present application, the terminal device may determine the resources and/or preamble for sending the second information according to whether the terminal device supports blind scheduling retransmission of the first information or supports monitoring of the grant for blind scheduling retransmission of the first information. Optionally, the second information may be sent before the first information.

Optionally, the embodiment of the present application uses the first information as Msg3 and the second information as Msg1 as an example to illustrate the technical solution of the present application. It should be noted that in other embodiments, the first information and the second information may be other information, and the embodiment of the present application does not limit this.

FIG8 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG8 , the method is applied to a terminal device, and the method includes:

S801. The terminal device determines resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3.

Optionally, in any embodiment of the present application, the blind scheduled retransmission of Msg3 can be replaced by at least one of the following: blind scheduled retransmission of initial blind Msg3 retransmission, blind scheduled retransmission after initial Msg3 transmission, blind retransmission scheduling of Msg3, blind retransmission scheduling of initial Msg3 transmission, and blind retransmission scheduling after initial Msg3 transmission.

Optionally, the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, which can also be referred to in other embodiments as: the terminal device has the blind scheduling retransmission capability of Msg3, or has the blind scheduling retransmission grant monitoring capability of Msg3.

Optionally, the terminal device may have configured whether the terminal device supports blind scheduling retransmission of Msg3 or whether it supports monitoring of grant for blind scheduling retransmission of Msg3 before leaving the factory. Optionally, the terminal device may receive a target configuration sent by other devices or network devices, and determine whether it supports blind scheduling retransmission of Msg3 or whether it supports monitoring of grant for blind scheduling retransmission of Msg3 according to the target configuration.

Optionally, the resource used to send Msg1 may include RO.

Optionally, the resource used to send Msg1 may include one of the following: a resource set, a resource, an RO set, a RO, a RACH resource set, a RACH resource. Optionally, the resource set may include one or more resources. Optionally, the RO set may include one or more ROs. Optionally, the RACH resource set may include one or more RACH resources.

Optionally, the preamble used to send Msg1 may include at least one of the following: a preamble set, a preamble. Optionally, the preamble may include one or more preambles.

Optionally, the resources and/or preamble used to send Msg1 may be determined by the terminal device according to pre-configuration, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.

Optionally, when the terminal device determines the resources and/or preamble for sending Msg1, the terminal device may send Msg1 based on the determined resources and/or preamble. Optionally, when the terminal device determines that the resources for sending Msg1 include one RO and/or one preamble, the terminal device may use the one RO and/or one preamble to send Msg1. Optionally, when the terminal device determines that the resources for sending Msg1 include multiple ROs and/or multiple preambbles, the terminal device may select one RO from multiple ROs and/or one preamble from multiple preambbles, and use the one RO and/or one preamble to send Msg1.

Optionally, the terminal device selects an RO from multiple ROs, which may include: the terminal device randomly selects an RO from multiple ROs, or the terminal device selects an RO from multiple ROs according to one or more characteristics applicable to random access. Optionally, the terminal device selects a preamble from multiple preambles, which may include: the terminal device randomly selects a preamble from multiple preambles, or the terminal device selects a preamble from multiple preambles according to one or more characteristics applicable to random access. Optionally, the selected RO and/or the selected preamble may correspond to all or part of the characteristics, and all the characteristics include one or more characteristics applicable to random access.

Optionally, in some other embodiments, S101 may be replaced by: the terminal device sends Msg1 using the target resource and/or target preamble according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3. Optionally, the target resource may include a first RO and the target preamble includes the first preamble, or the target resource may include a second RO and the target preamble includes a second preamble.

Optionally, when the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of blind scheduling retransmission grant of Msg3, the terminal device can monitor the blind scheduling retransmission grant of Msg3. Optionally, when the terminal device does not support blind scheduling retransmission of Msg3 or does not support monitoring of blind scheduling retransmission grant of Msg3, the terminal device will not monitor the blind scheduling retransmission grant of Msg3.

Optionally, the blind scheduling retransmission grant of Msg3 may include at least one of the following: indication information of blind scheduling retransmission of Msg3, time domain position information of retransmitted Msg3, frequency domain position information of retransmitted Msg3, and transmission power information of retransmitted Msg3. Optionally, the time domain position information may include at least one of the following: frame, subframe, time slot, symbol, etc.

In an embodiment of the present application, the terminal device determines the resources and/or preamble used to send Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3. In this way, the terminal device can indicate to the network device whether it supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3 through the set resources and/or preamble, which is conducive to the network device to make scheduling decisions according to the terminal device's support for blind scheduling retransmission of Msg3 or monitoring of grant for blind scheduling retransmission of Msg3, thereby facilitating the improvement of the efficiency of resource scheduling of the network device.

FIG. 9 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG. 9 , the method is applied to a network device, and the method includes:

S901. The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of the blind scheduling retransmission grant of Msg3 according to the resources and/or preamble corresponding to the received Msg1.

Optionally, the network device can determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on whether the resources and/or preamble corresponding to the received Msg1 are included in the first RACH resources and/or the first preamble set. Exemplarily, in the case of yes, it is determined that the terminal device supports it, and/or, in the case of no, it is determined that the terminal device does not support it.

Optionally, the network device can determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to whether the resources and/or preamble corresponding to the received Msg1 are included in the second RACH resources and/or the second preamble set. Exemplarily, in the case of yes, it is determined that the terminal device does not support, and/or, in the case of no, it is determined that the terminal device supports.

Optionally, the network device can determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and/or preamble corresponding to the received Msg1, which are included in the first RACH resource or the second RACH resource, and/or, which are included in the first preamble set or the second preamble set. Exemplarily, in the case of including in the first RACH resource and/or the first preamble set, it is determined that the terminal device supports it, and/or, in the case of including in the second RACH resource and/or the second preamble set, it is determined that the terminal device does not support it.

In some other embodiments, the network device may determine whether to send a blind scheduling retransmission grant of Msg3 to the terminal device based on the resources and/or preamble corresponding to the received Msg1.

In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, the terminal device uses the first random access channel opportunity RO and/or the first preamble to send the Msg1.

In some embodiments, the method further includes: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, the terminal device uses a second RO and/or a second preamble to send the Msg1.

In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, the terminal device sends the Msg1 based on the first RACH resource and/or the first preamble set. Optionally, the terminal device sends the Msg1 based on the first RACH resource and/or the first preamble set, which may include: the terminal device selects a first RO and/or a first preamble from the first RACH resource and/or the first preamble set, and uses the first RO and/or the first preamble to send the Msg1.

In some embodiments, the method further includes: when the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, the terminal device sends the Msg1 based on the second RACH resource and/or the second preamble set. Optionally, the terminal device sends the Msg1 based on the second RACH resource and/or the second preamble set, which may include: the terminal device selects a second RO and/or a second preamble from the second RACH resource and/or the second preamble set, and uses the second RO and/or the second preamble to send the Msg1.

Optionally, the first RO may be included in a first RACH resource. Optionally, the first preamble may be included in a first preamble set. Optionally, the second RO may be included in a second RACH resource. Optionally, the second preamble may be included in a second preamble set.

Optionally, in any embodiment of the present application, the first RACH resource may include one or more ROs. Optionally, in any embodiment of the present application, the first preamble set may include one or more preambles. Optionally, in any embodiment of the present application, the second RACH resource may include one or more ROs. Optionally, in any embodiment of the present application, the second preamble set may include one or more preambles.

Corresponding to the network device side:

In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and/or preamble corresponding to the received Msg1, including: when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 based on the resources and/or preamble corresponding to the received Msg1, including: when the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3.

In other embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3 to the terminal device, and/or, when the Msg1 corresponds to the second RO and/or the second preamble, the network device does not send a blind scheduling retransmission grant of Msg3 to the terminal device.

In some embodiments, the method further includes: the terminal device receives configuration information of the first RO and/or the first preamble. Optionally, the terminal device receives configuration information of the first RO and/or the first preamble sent by a network device. In this way, the first RO and/or the first preamble, or the configuration information of the first RO and/or the first preamble, is received by the terminal device.

In some embodiments, the method further includes: the terminal device receives configuration information of the second RO and/or the second preamble. Optionally, the terminal device receives configuration information of the second RO and/or the second preamble sent by the network device. In this way, the second RO and/or the second preamble, or the configuration information of the second RO and/or the second preamble, is received by the terminal device.

In some embodiments, the method further includes: the terminal device determines the second RO based on the first RO. Optionally, the second RO may not overlap/be the same as the first RO. Optionally, the terminal device may determine the second RO based on the first RO and the resources available for sending Msg1. For example, the second RO may be an RO other than the first RO in the resources available for sending Msg1.

In some embodiments, the method further includes: the terminal device determines the first RO according to the second RO. Optionally, the terminal device may determine the first RO according to the second RO and the resources available for sending Msg1. For example, the first RO may be an RO other than the second RO in the resources available for sending Msg1.

In some embodiments, the method further includes: the terminal device determines the second preamble according to the first preamble. Optionally, the first preamble may be different from the second preamble. Optionally, the terminal device may determine the second preamble according to the first preamble and a preamble set that can be used to send Msg1. For example, the second preamble may be a preamble other than the first preamble in the preamble set that can be used to send Msg1.

In some embodiments, the method further includes: the terminal device determines the first preamble according to the second preamble. Optionally, the terminal device may determine the first preamble according to the second preamble and a preamble set that can be used to send Msg1. For example, the first preamble may be a preamble other than the second preamble in the preamble set that can be used to send Msg1.

In some embodiments, the method further includes: the terminal device receives configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble. Optionally, the terminal device receives configuration information of the first RACH resource and/or the first preamble set sent by a network device. In this way, the first RACH resource and/or the first preamble set, or the first RACH resource and/or the first preamble set, is received by the terminal device.

In some embodiments, the method further includes: the terminal device receives configuration information of a second RACH resource and/or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble. Optionally, the terminal device receives configuration information of a second RACH resource and/or a second preamble set sent by a network device. In this way, the second RACH resource and/or the second preamble set, or the configuration information of the second RACH resource and/or the second preamble set, is received by the terminal device.

In some embodiments, the method further includes: the terminal device determines the second RACH resource based on the first RACH resource. Optionally, the first RACH resource may not overlap/be the same as the second RACH resource. Optionally, the terminal device may determine the second RACH resource based on the first RACH resource and the resources available for sending Msg1. For example, the second RACH resource may be all or part of the resources available for sending Msg1, except the first RACH resource.

In some embodiments, the method further includes: the terminal device determines the first RACH resource according to the second RACH resource. Optionally, the terminal device may determine the first RACH resource according to the second RACH resource and the resource available for sending Msg1. For example, the first RACH resource may be all or part of the resources available for sending Msg1 except the second RACH resource.

In some embodiments, the method further includes: the terminal device determines the second preamble set according to the first preamble set. Optionally, the terminal device may determine the second preamble set according to the first preamble set and the preamble set that can be used to send Msg1. For example, the second preamble set may be all or part of the preambles other than the first preamble set in the preamble set that can be used to send Msg1.

In some embodiments, the method further includes: the terminal device determines the first preamble set according to the second preamble set. Optionally, the terminal device may determine the first preamble set according to the second preamble set and the preamble set that can be used to send Msg1. For example, the first preamble set may be all or part of the preambles in the preamble set that can be used to send Msg1, except the second preamble set.

Optionally, at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set can be configured to the terminal device through a broadcast message (for example, a SIBx message or a MIB message) or a terminal device-specific signaling (such as RRC signaling or other signaling). Optionally, x in SIBx can be any integer greater than or equal to 1. For example, the terminal device receives a SIBx message or a MIB message broadcast by a network device, and the SIBx message or the MIB message includes: at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set. For another example, the terminal device receives RRC signaling or other signaling sent by the network device, and the RRC signaling or other signaling includes: at least one of the first RO, the second RO, the first preamble, the second preamble, the first RACH resource, the second RACH resource, the first preamble set, and the second preamble set.

Optionally, terminal device dedicated signaling can be called UE dedicated signaling.

Optionally, the first RO may be one RO, or the first RO may be multiple ROs. Optionally, the second RO may be one RO, or the second RO may be multiple ROs. Optionally, the first preamble may be one preamble, or the first preamble may be multiple preambles. Optionally, the second preamble may be one preamble, or the second preamble may be multiple preambles.

Corresponding to the network device side:

In some embodiments, the method further includes: the network device sending the configuration information of the first RO and/or the first preamble. Optionally, the network device may broadcast or multicast the configuration information of the first RO and/or the first preamble. Optionally, the network device may unicast the configuration information of the first RO and/or the first preamble to the terminal device.

In some embodiments, the method further includes: the network device sending the configuration information of the second RO and/or the second preamble. Optionally, the network device may broadcast or multicast the configuration information of the second RO and/or the second preamble. Optionally, the network device may unicast the configuration information of the second RO and/or the second preamble to the terminal device.

In some embodiments, the method further includes: the network device sends configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble. Optionally, the network device may broadcast or multicast the configuration information of the first RACH resource and/or the first preamble set. Optionally, the network device may unicast the configuration information of the first RACH resource and/or the first preamble set to the terminal device.

In some embodiments, the method further includes: the network device sends configuration information of a second RACH resource and/or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble. Optionally, the network device may broadcast or multicast the configuration information of the second RACH resource and/or the second preamble set. Optionally, the network device may unicast the configuration information of the second RACH resource and/or the second preamble set to the terminal device.

In some embodiments, the first RO and/or the first preamble corresponds to a non-terrestrial communication network NTN.

In some embodiments, the first RACH resource and/or the first preamble set corresponds to the NTN.

In some embodiments, the second RO and/or the second preamble corresponds to NTN.

In some embodiments, the second RACH resource and/or the second preamble set corresponds to the NTN.

Optionally, at least one of the first RO, the second RO, the first RACH resource, and the second RACH resource may be defined only in the NTN but not in the TN, or may be defined in the NTN and the TN.

Optionally, at least one of the first preamble, the second preamble, the first preamble set, and the second preamble set may be defined only in the NTN but not in the TN, or may be defined in the NTN and the TN.

In some embodiments, at least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device through a broadcast message or a signaling dedicated to the terminal device.

In some embodiments, at least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device through a broadcast message or a signaling dedicated to the terminal device.

Optionally, the broadcast message in any embodiment of the present application may include one of the following: SIBx message, MIB message, system message, synchronization signal block (Synchronization Signal Block, SSB); x in SIBx can be any integer greater than or equal to 1.

Optionally, the terminal device-specific signaling in any embodiment of the present application may include RRC signaling or other signaling.

Corresponding to the network device side:

The method further comprises: the network device sending a broadcast message or the terminal device dedicated signaling;

The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or,

The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set.

Optionally, the network device may broadcast the broadcast message, or the network device may send the terminal device-specific signaling to the terminal device.

In some embodiments, the terminal device determines the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including:

The terminal device determines the resources and/or preamble used to send the Msg1 according to whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell.

Optionally, the terminal device may periodically or non-periodically measure the reference signal of the current serving cell to obtain a measurement result. Optionally, the terminal device may receive a measurement configuration sent by a network device, and measure the reference signal of the current serving cell according to the measurement configuration. Optionally, the measurement configuration sent by the network device may include the measurement configuration of the current serving cell, but not the measurement configuration of other cells outside the current serving cell, or may include the measurement configuration of the current serving cell and the measurement configuration of other cells outside the current serving cell.

Optionally, the measurement results may include at least one of the following measurement parameter values: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Signal to Interference plus Noise Ratio (SINR), Received Signal Code Power (RSCP), and Signal Noise Ratio (SNR).

Optionally, the reference signal may include at least one of the following: SSB, Channel State Information-Reference Signal (CSI-RS). Among them, SSB can also be called Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH block). It should be noted that the reference signal can also be other signals, such as new reference signals defined in NTN, or other signals specified in the protocol, which is not limited in the embodiments of the present application.

Optionally, the terminal device determines the resources and/or preamble for sending the Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports grant monitoring of blind scheduling retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell and the size of a certain threshold. Optionally, the certain threshold includes a first threshold, a second threshold or a third threshold, etc.

Optionally, in any embodiment of the present application, the reference signal measurement result is greater than or equal to a certain threshold (including a first threshold, a second threshold or a third threshold, etc.), and may include: at least one measurement value in the reference signal measurement result is respectively greater than or equal to at least one sub-threshold, and the measurement value may correspond to the sub-threshold one by one. Exemplarily, the reference signal measurement result includes an RSRP value and an RSRQ value, and the reference signal measurement result is greater than or equal to a certain threshold, and may include: an RSRP value is greater than or equal to a first sub-threshold, and an RSRQ value is greater than or equal to a second sub-threshold.

Optionally, in any embodiment of the present application, the reference signal measurement result is less than or equal to a threshold (including a first threshold, a second threshold or a third threshold, etc.), and may include: at least one measurement value in the reference signal measurement result is less than or equal to at least one sub-threshold, and the measurement value may correspond one-to-one to the sub-threshold.

In some embodiments, the method further includes: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, and the reference signal measurement result is less than or equal to a first threshold, the terminal device uses a first RO and/or a first preamble to send the Msg1.

In some embodiments, the method further includes: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to the first threshold, the terminal device uses a second RO and/or a second preamble to send the Msg1.

Optionally, the terminal device may first determine whether blind scheduling retransmission of Msg3 is supported or whether grant monitoring of blind scheduling retransmission of Msg3 is supported. If yes, the terminal device determines whether the reference signal measurement result is less than or equal to the first threshold. If yes, the first RO and/or the first preamble are used to send the Msg1. Optionally, when the terminal device determines that at least one of the two conditions is no, the second RO and/or the second preamble are used to send the Msg1.

Optionally, the terminal device may first determine whether the reference signal measurement result is less than or equal to the first threshold. If so, the terminal device determines whether blind scheduling retransmission of Msg3 is supported or whether grant monitoring of blind scheduling retransmission of Msg3 is supported. If so, the first RO and/or the first preamble are used to send the Msg1. Optionally, when the terminal device determines that at least one of the two conditions is no, the second RO and/or the second preamble are used to send the Msg1.

Corresponding to the network device side:

In some embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including: when the Msg1 corresponds to the first RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determines that the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the first threshold.

In some embodiments, when the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including: when the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and/or determines that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold.

In some embodiments, the method further includes: when the terminal device supports/requests Msg3 repetition transmission (Mg3 repetition), supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and when the reference signal measurement result is less than or equal to a second threshold, the terminal device uses the first RO and/or the first preamble to send the Msg1.

Optionally, the terminal device may have been configured whether to support repeated transmission of Msg3 before leaving the factory. Optionally, the terminal device may receive a target configuration sent by other devices or network devices, and determine whether to support repeated transmission of Msg3 according to the target configuration.

Optionally, in any embodiment of the present application, repeated transmission of Msg3 may also be referred to as Msg3 repetition.

Optionally, the second threshold may be the same as or different from the first threshold. Optionally, the second threshold may be greater than, less than or equal to the first threshold.

In some embodiments, the method further includes: when the terminal device supports/requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3, or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to a second threshold, the terminal device uses a second RO and/or a second preamble to send the Msg1.

In some embodiments, the method also includes: when the terminal device does not support/request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to a third threshold, the terminal device uses the first RO and/or the first preamble to send the Msg1.

Optionally, the third threshold may be the same as or different from the first threshold. Optionally, the third threshold may be greater than, less than, or equal to the first threshold. Optionally, the third threshold may be the same as or different from the second threshold. Optionally, the third threshold may be greater than, less than, or equal to the second threshold.

In some embodiments, the method further includes: when the terminal device does not support/request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3, or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to a third threshold, the terminal device uses a second RO and/or a second preamble to send the Msg1.

Optionally, the terminal device may first determine whether the terminal device supports repeated transmission of Msg3, and/or whether it supports blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and then determine the difference between the reference signal measurement result and the second threshold or the third threshold. Optionally, the terminal device may first determine the difference between the reference signal measurement result and the second threshold or the third threshold, and then determine whether the terminal device supports repeated transmission of Msg3, and/or whether it supports blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3.

Corresponding to the network device side:

In some embodiments, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including:

In a case where the Msg1 corresponds to the first RO and/or the first preamble, the network device determines one of the following:

The terminal device supports/requests repeated transmission of Msg3, supports blind scheduling retransmission of Msg3, or supports grant monitoring of blind scheduling retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold;

The terminal device does not support/request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold.

In some embodiments, when the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including:

In the case where the Msg1 corresponds to the second RO and/or the second preamble, the network device determines one of the following:

The terminal device supports/requests repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold;

The terminal device does not support/request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold.

In some embodiments, the method further includes: the terminal device receiving at least one of the following: a first threshold, a second threshold, and a third threshold.

Optionally, the terminal device may receive at least one of the following sent by the network device: a first threshold, a second threshold, and a third threshold.

Corresponding to the network device side:

In some embodiments, the method further comprises: the network device sending at least one of the following: a first threshold, a second threshold, and a third threshold. Optionally, the network device may broadcast, multicast, or unicast at least one of the following to the terminal device: the first threshold, the second threshold, and the third threshold.

In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold. Optionally, the predefined threshold may be a threshold predefined by a terminal device, or may be a threshold predefined by a network device.

In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a threshold specified by a protocol.

In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is configured to the terminal device through a broadcast message (e.g., a SIBx message or a MIB message) or a dedicated signaling of the terminal device (e.g., an RRC signaling or other signaling). For example, the terminal device receives a SIBx message or a MIB message broadcast by a network device, and the SIBx message or the MIB message includes at least one of the first threshold, the second threshold, and the third threshold. For another example, the terminal device receives an RRC signaling or other signaling sent by a network device, and the RRC signaling or other signaling includes at least one of the first threshold, the second threshold, and the third threshold.

In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. In other embodiments, the first threshold can be determined based on the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. Exemplarily, the first threshold can be determined based on the result of adding/subtracting a relative threshold from the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. The value of the relative threshold can be a predefined value or a network configured value. In some embodiments, the second threshold and/or the third threshold can be a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. In other embodiments, the second threshold and/or the third threshold can be determined based on the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. Exemplarily, the second threshold and/or the third threshold can be determined based on the result of adding/subtracting a relative threshold from the threshold used by the terminal device to determine whether to request repeated transmission of Msg3. The value of the relative threshold can be a predefined value or a network configured value.

Optionally, the threshold used by the terminal device to determine whether to request repeated transmission of Msg3 may be rsrp-ThresholdMsg3.

In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered; the multiple characteristics include the first characteristic.

Optionally, the terminal device may determine a priority of each of the multiple characteristics, wherein the priority of each of the multiple characteristics is used to determine resources and/or preamble for sending the Msg1 in case of random access to which the multiple characteristics are applicable/triggered.

Optionally, the first priority, or the priority of each of the multiple characteristics, is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered, and there is no RO and/or preamble, or there are no resources and/or preamble, which can indicate all characteristics that trigger random access. Optionally, all characteristics can be multiple characteristics.

In some embodiments, in the case of random access to which multiple characteristics are applicable/triggered, the terminal device may send the Msg1 using a first RO and/or a first preamble corresponding to multiple characteristics, or resources and/or preamble corresponding to multiple characteristics.

In some embodiments, in the case of random access to which multiple characteristics are applicable/triggered, and there is no RO and/or preamble, or no resources and/or preamble, corresponding to all characteristics (i.e., multiple characteristics), some of the multiple characteristics can be determined according to the priorities corresponding to the multiple characteristics, and the Msg1 can be sent using the first RO and/or first preamble corresponding to the some characteristics, or the resources and/or preamble corresponding to the some characteristics.

In some embodiments, the method further includes: the terminal device receiving the first priority configuration. Optionally, the terminal device receives the first priority configuration sent by a network device.

In some embodiments, the method further comprises: the terminal device receiving a priority configuration of at least one characteristic other than the first characteristic. Optionally, the terminal device receives a priority configuration of at least one characteristic other than the first characteristic sent by a network device.

In other embodiments, the first priority, and/or the priority of at least one characteristic other than the first characteristic, may be determined by the terminal device according to preconfiguration, or may be agreed upon by a protocol.

Optionally, the first priority, and/or the priority of at least one characteristic other than the first characteristic, can be configured to the terminal device through a broadcast message (e.g., a SIBx message or a MIB message) or terminal device-specific signaling (e.g., RRC signaling or other signaling). For example, the terminal device receives a SIBx message or a MIB message broadcast by a network device, and the SIBx message or the MIB message includes: the first priority, and/or the priority of at least one characteristic other than the first characteristic. For another example, the terminal device receives RRC signaling or other signaling sent by a network device, and the RRC signaling or other signaling includes: the first priority, and/or the priority of at least one characteristic other than the first characteristic.

Optionally, at least one characteristic other than the first characteristic may include at least one of a second characteristic, a third characteristic, a fourth characteristic, etc. Optionally, the second characteristic corresponds to that the terminal device supports Msg3 repetition. Optionally, the third characteristic corresponds to that the terminal device is a reduced capability (Redcap) terminal. Optionally, the fourth characteristic corresponds to that the terminal device supports small data transmission (SDT).

It should be noted that the present application only exemplarily lists at least one characteristic other than the first characteristic. In other embodiments, the at least one characteristic other than the first characteristic may also include other characteristics, for example, the fifth characteristic and/or the sixth characteristic, etc.

Corresponding to the network device side:

In some embodiments, the method further includes: the network device sending the first priority configuration. Optionally, the network device broadcasts, multicasts, or unicasts the first priority configuration to the terminal device.

In some embodiments, the method further comprises: the network device sending a priority configuration of at least one characteristic other than the first characteristic. Optionally, the network device broadcasts, multicasts or unicasts the priority configuration of at least one characteristic other than the first characteristic to the terminal device.

In some embodiments, the second priority is higher than the first priority, or the value of the second priority is lower than the first priority. The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3. In other embodiments, the second priority is lower than or equal to the first priority.

Optionally, the feature priority of the third feature may be the third priority, and the feature priority of the fourth feature may be the fourth priority. Optionally, the third priority may be higher, equal to, or lower than the first priority. Optionally, the fourth priority may be higher, equal to, or lower than the first priority. Optionally, the third priority may be higher, equal to, or lower than the second priority. Optionally, the fourth priority may be higher, equal to, or lower than the second priority. Optionally, the fourth priority may be higher, equal to, or lower than the third priority.

It should be noted that if the priority of A is higher than the priority of B, the value of the priority of A is smaller than the value of the priority of B. Correspondingly, if the priority of A is lower than the priority of B, the value of the priority of A is larger than the value of the priority of B.

In some embodiments, the method further includes: when random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, the terminal device sends the Msg1 using a third RO and/or a third preamble.

Optionally, the third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access. Optionally, all characteristics include the first characteristic and at least one characteristic other than the first characteristic.

Optionally, the third RO and/or the third preamble may correspond to all characteristics.

Exemplarily, when at least one characteristic other than the first characteristic is the second characteristic, the first characteristic corresponds to a first RACH resource and/or a first preamble set, the second characteristic corresponds to a fifth RACH resource and/or a fifth preamble set, the third RO may be included in the intersection of the first RACH resource and the fifth RACH resource, and the third preamble is included in the intersection of the first preamble set and the fifth preamble set.

Corresponding to the network device side:

In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1, including:

The network device determines, according to the third RO and/or the third preamble corresponding to the received Msg1, that random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or determines that random access is triggered by the first characteristic and at least one characteristic other than the first characteristic;

The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access.

In some embodiments, the method further includes: when the random access is applicable to the first characteristic and at least one characteristic other than the first characteristic at the same time, or when the random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, and there is no third RACH resource and/or third preamble set for indicating all characteristics that trigger the random access, and there is at least one fourth RACH resource and/or fourth preamble set for indicating some of all characteristics that trigger the random access, the terminal device sends the Msg1 using a fourth RO and/or a fourth preamble.

Optionally, the terminal device uses a fourth RO and/or a fourth preamble to send the Msg1, which may include: the terminal device selects a fourth RACH resource and/or a fourth preamble set from at least one fourth RACH resource and/or at least one fourth preamble set according to the first priority and the priority of each of the at least one characteristic, and uses the fourth RO and/or the fourth preamble to send the Msg1.

Optionally, the fourth RO and/or fourth preamble is included in the selected fourth RACH resource and/or a fourth preamble set. Optionally, the fourth RO and/or fourth preamble can be used to indicate some of all characteristics triggering the random access.

Optionally, the third RACH resource and/or the third preamble set may include one or more ROs and/or one or more preambles. Optionally, the fourth RACH resource and/or the fourth preamble set may include one or more ROs and/or one or more preambles.

Exemplarily, when at least one characteristic other than the first characteristic is the second characteristic, the first characteristic corresponds to a first RACH resource and/or a first preamble set, and the second characteristic corresponds to a fifth RACH resource and/or a fifth preamble set. If the first RACH resource has no intersection with the fifth RACH resource, and/or if the first preamble set has no intersection with the fifth preamble set, there is no third RACH resource and/or a third preamble set for indicating all characteristics (i.e., the first characteristic and the second characteristic) for triggering the random access, and the terminal device can determine, based on the first priority and the second priority, that the fifth RACH resource and/or the fifth preamble set is a selected fourth RACH resource and/or a fourth preamble set.

In this way, when random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, and there is no RO and/or preamble that can correspond to all characteristics, and there is a fourth RO and/or a fourth preamble corresponding to some characteristics, the Msg1 is sent using the fourth RO and/or the fourth preamble.

Corresponding to the network device side:

In some embodiments, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1, including:

The network device determines that random access is applicable to some characteristics, or determines that random access is triggered by some characteristics according to the fourth RO and/or fourth preamble corresponding to the received Msg1; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic.

The fourth RO and/or fourth preamble are included in a fourth RACH resource and/or a fourth preamble set;

The one fourth RACH resource and/or one fourth preamble set is selected from at least one fourth RACH resource and/or at least one fourth preamble set;

The at least one fourth RACH resource and/or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access.

In some embodiments, the method further includes: when the terminal device uses the first RO and/or the first preamble to send the Msg1, the terminal device monitors the blind scheduling retransmission grant of Msg3.

Optionally, the terminal device may listen for the blind scheduling retransmission grant of Msg3 after sending Msg1. Exemplarily, the terminal device may start listening for the blind scheduling retransmission grant of Msg3 from the time of sending Msg1 as the starting point, at least at a first time interval of the round-trip delay between the terminal device and the network device. Also exemplarily, the terminal device may start listening for the blind scheduling retransmission grant of Msg3 from the time of initial transmission of Msg3 as the starting point, at least at a second time interval of the round-trip delay between the terminal device and the network device. Also exemplarily, the terminal device may start listening for the blind scheduling retransmission grant of Msg3 at any time between the first time and the second time.

Optionally, the duration for which the terminal device monitors the blind scheduling retransmission grant of Msg3 can be a preset duration. Optionally, the terminal device can periodically or non-periodically monitor the blind scheduling retransmission grant of Msg3. Optionally, the terminal device can receive the scheduling number sent by the network device, and according to the scheduling number, start a monitoring timer for the scheduling number of times, and monitor the blind scheduling retransmission grant of Msg3 during the operation of the monitoring timer. Optionally, each time the terminal device receives the blind scheduling retransmission grant of Msg3, it can include indication information for indicating whether there is a next blind scheduling retransmission grant of Msg3.

In some embodiments, the method further includes: when the terminal device uses the second RO and/or the second preamble to send the Msg1, the terminal device does not monitor the blind scheduling retransmission grant of Msg3.

Optionally, the terminal device monitors Msg4 during the time when the ra-ContentionResolutionTimer is turned on, and does not need to monitor Msg4 outside the time when the ra-ContentionResolutionTimer is turned on.

Corresponding to the network device side:

In some embodiments, the method further includes: when the Msg1 corresponds to the first RO and/or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3.

In some embodiments, the method further includes: when the Msg1 corresponds to the second RO and/or the second preamble, the network device does not send a blind scheduling retransmission grant of the Msg3.

In an embodiment of the present application, a terminal device determines the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3. A network device sends or does not send a blind scheduling retransmission grant for Msg3 according to the resources and/or preamble corresponding to the received Msg1. Optionally, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device sends a blind scheduling retransmission grant for Msg3, and/or, when the Msg1 corresponds to the second RO and/or the second preamble, the network device does not send a blind scheduling retransmission grant for Msg3.

The communication method of the embodiment of the present application is further described below:

Embodiment 1:

In the NTN cell, the network device configures a separate first RACH resource and/or a first preamble set for the UE that supports blind scheduling retransmission (grant monitoring) of the initial transmission of Msg3, and the UE that supports blind scheduling retransmission monitoring of the initial transmission of Msg3 uses the first RACH resource and/or the first preamble set to send Msg1, thereby informing the network device that the UE can receive the blind scheduling retransmission grant for the initial transmission of Msg3.

The specific implementation process is as follows:

1. The UE receives the RACH configuration information from the network device, including:

a) configuring a separate first RACH resource and/or a first preamble set for a UE supporting blind scheduling and retransmission (grant monitoring) of initial transmission of Msg3, that is, a feature set or feature combination (featureCombination) corresponding to the first RACH resource and/or the first preamble set includes the feature of blind scheduling (grant monitoring) of initial transmission of Msg3 (in NTN);

b) the first RACH resource and/or the first preamble set configuration may only appear in the NTN cell;

c) The first RACH resource and/or the first preamble set configuration information is configured to the UE via broadcast (such as SIBx) or UE-specific signaling (such as RRC signaling).

2. During the random access process, the UE determines the resources used to transmit Msg1 based on whether it supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3:

a) If the UE supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, the UE sends Msg1 using the first RACH resource and/or the RO and/or preamble in the first preamble set;

b) If the UE does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, the UE uses the RO and/or preamble in the second RACH resource and/or the second preamble set to send Msg1, and the featureCombination corresponding to the second RACH resource and/or the second preamble set does not include the feature of blind scheduling (grant monitoring) for the initial transmission of Msg3 (in NTN).

FIG. 10 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG. 10 , the network device is configured with at least one of the following:

A first RACH configuration and/or a first preamble set;

A second RACH configuration and/or a second preamble set.

In this way, a UE that supports blind scheduling retransmission (grant monitoring) for initial transmission of Msg3 uses the first RACH configuration and/or the first preamble set to send Msg1, and/or a UE that does not support blind scheduling retransmission (grant monitoring) for initial transmission of Msg3 uses the second RACH configuration and/or the second preamble set to send Msg1.

Optionally, in any embodiment of the present application, the UE sends Msg1 using the first RACH configuration and/or the first preamble set, which may include: the UE sends Msg1 using the first RO in the first RACH and/or the first preamble in the first preamble set.

Optionally, in any embodiment of the present application, the UE sends Msg1 using the second RACH configuration and/or the second preamble set, which may include: the UE sends Msg1 using the second RO in the second RACH and/or the second preamble in the second preamble set.

Embodiment 2:

In the NTN cell, the network device configures a separate first RACH resource and/or a first preamble set for the UE that supports the blind scheduled retransmission (grant monitoring) of the initial transmission of Msg3 and has the need to monitor the blind scheduled retransmission grant of the initial transmission of Msg3, as well as a first RSRP threshold for the UE to decide whether to request or monitor the blind scheduled retransmission grant of the initial transmission of Msg3. When the RSRP measurement result of the UE that supports the blind scheduled retransmission grant monitoring of the initial transmission of Msg3 is less than (or equal to) the first RSRP threshold, the UE uses the first RACH resource and/or the first preamble set to send Msg1, thereby informing the network device that the UE can receive the blind scheduled retransmission grant for the initial transmission of Msg3.

The specific implementation process is as follows:

1. The UE receives the RACH configuration information from the network device, including:

a) configuring a separate first RACH resource and/or a first preamble set for a UE that supports blind scheduling and retransmission (grant monitoring) of initial transmission of Msg3, that is, the featureCombination corresponding to the first RACH resource and/or the first preamble set includes blind scheduling (grant monitoring) of initial transmission of Msg3 (in NTN);

b) A first RSRP threshold for the UE to determine whether to request or monitor the blind scheduling retransmission (grant monitoring) of the initial transmission of Msg3. Further, the first RSRP threshold may be one of the following options:

Option 1: Introduce a separate RSRP threshold parameter;

Option 2: Reuse the RSRP threshold parameter rsrp-ThresholdMsg3 in the related art for UE to decide whether to request Msg3 repetition (repeated transmission of Msg3);

Option 3: Introduce two separate RSRP threshold parameters, the two RSRP thresholds are respectively for UEs that support/request repeated transmission of Msg3 and UEs that do not support/request repeated transmission of Msg3;

c) the first RACH resource and/or the first preamble set configuration may only appear in the NTN cell;

d) The above configuration information is configured to the UE via broadcast (such as SIBx) or UE-specific signaling (such as RRC signaling).

2. During the random access process, the UE determines the resources for transmitting Msg1 based on whether it supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3 and the RSRP measurement result:

a) If the UE supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, and the RSRP measurement value of the UE is less than (or equal to) the first RSRP threshold, the UE uses the first RACH resource and/or the RO and/or preamble in the first preamble set to send Msg1;

b) Otherwise (i.e., if the UE does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, or the RSRP measurement value of the UE is greater than (or equal to) the first RSRP threshold), the UE uses the second RACH resource and/or the RO and/or preamble in the second preamble set to send Msg1, and the featureCombination corresponding to the second RACH resource and/or the second preamble set does not include blind scheduling (grant monitoring) for the initial transmission of Msg3 (in NTN).

FIG. 11 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG. 11 , the network device is configured with at least one of the following:

A first RACH configuration and/or a first preamble set;

a second RACH configuration and/or a second preamble set;

The first RSRP threshold.

In this way, if the UE supports blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3 and the RSRP measurement amount of the UE is less than (or equal to) the first RSRP threshold, the UE uses the first RACH configuration and/or the first preamble set to send Msg1, and/or, if the UE does not support blind scheduling retransmission (grant monitoring) for the initial transmission of Msg3, or the RSRP measurement amount of the UE is greater than (or equal to) the first RSRP threshold, the UE uses the second RACH configuration and/or the second preamble set to send Msg1.

Embodiment three:

A feature priority parameter (i.e., the first priority mentioned above) is introduced for the feature of blind scheduling (grant monitoring) of initial transmission of Msg3 (in NTN). The role of the feature priority is that in random access when multiple features are applicable (triggered) at the same time, the UE selects RACH resources and/or preamble according to the feature priorities of these multiple features.

The specific implementation process is as follows:

1. UE receives configuration information of network equipment, including:

a) The feature priority of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3;

b) Further, the feature priority of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 only appears when the first RACH resource and/or the first preamble set of the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 is configured;

c) Optionally, when the network device is configured with both the feature priority of the Msg3 repetition feature and the feature priority of the blind scheduling (grant monitoring) feature for Msg3 initial transmission, it is required that the feature priority of the Msg3 repetition feature configured by the network device must be higher than the feature priority of the blind scheduling (grant monitoring) feature for Msg3 initial transmission (i.e., the feature priority value of the Msg3 repetition feature is smaller than the feature priority value of the blind scheduling (grant monitoring) feature for Msg3 initial transmission);

2. During the random access process, if the current random access is simultaneously applicable to the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 (in NTN) and other features (such as at least one of RedCap, SDT, Msg3 Repetition, etc.), that is, the current random access is simultaneously triggered by the blind scheduling (grant monitoring) feature for the initial transmission of Msg3 (in NTN) and at least one other feature:

If no RACH resource set can be used to indicate all the characteristics that trigger this random access procedure, and at least one RACH resource set can be used to indicate some of the characteristics that trigger this random access procedure, the UE selects an available resource set from the RACH resource sets that can be used to indicate some of the characteristics that trigger this random access procedure based on the characteristic priorities of these characteristics.

The embodiment of the present application provides a method for a terminal device in an NTN to assist a network device in scheduling Msg3. In view of the blind scheduling retransmission (grant monitoring) characteristics of the initial transmission of Msg3 in the NTN, a separate RACH resource and/or preamble set is introduced. When the terminal device has the ability to monitor the blind scheduling retransmission Grant for the initial transmission of Msg3 and/or has the blind scheduling retransmission requirement for the initial transmission of Msg3, the terminal device sends Msg1 by using the separate RACH and/or preamble resources. Using this method, on the one hand, the network device can be informed whether the terminal device has this capability, thereby assisting the network device in making scheduling decisions; on the other hand, the terminal device only monitors the blind scheduling retransmission grant for the initial transmission of Msg3 when the channel quality is poor, thereby avoiding unnecessary PDCCH monitoring and saving power consumption of the terminal device.

In the embodiment of the present application, the network device configures a separate RACH resource and/or preamble set configuration for the blind scheduling retransmission (grant monitoring) characteristics of the initial transmission of Msg3 in the NTN.

In an embodiment of the present application, a UE that supports blind scheduling of retransmission grant for initial transmission of Msg3 sends Msg1 using the separate RACH resource and/or preamble set.

In the embodiment of the present application, the network device configuration information also includes a first RSRP threshold for the UE to determine whether to request or monitor the blind scheduling retransmission grant of the initial transmission of Msg3.

In an embodiment of the present application, a UE that supports blind scheduling of retransmission grant for initial transmission of Msg3 sends Msg1 using the separate RACH resource and/or preamble set when the RSRP measurement result is less than (or equal to) the first RSRP threshold.

In an embodiment of the present application, a feature priority parameter is introduced for the feature of blind scheduling (grant monitoring) of initial transmission of Msg3 (in NTN). The role of the feature priority is that in random access where multiple features are applicable (or triggered) at the same time, the UE selects RACH resources and/or preamble according to the feature priorities of these multiple features.

The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, the technical solution of the present application can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present application. For example, the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further explain various possible combinations. For another example, the various different embodiments of the present application can also be arbitrarily combined, as long as they do not violate the idea of the present application, they should also be regarded as the contents disclosed in the present application. For another example, the various embodiments and/or the technical features in the various embodiments described in the present application can be arbitrarily combined with the prior art without conflict, and the technical solution obtained after the combination should also fall within the protection scope of the present application.

It should also be understood that in various method embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. In addition, in the embodiment of the present application, the terms "downlink", "uplink" and "side" are used to indicate the transmission direction of the signal or data, wherein "downlink" is used to indicate that the transmission direction of the signal or data is the first direction sent from the site to the user equipment of the cell, "uplink" is used to indicate that the transmission direction of the signal or data is the second direction sent from the user equipment of the cell to the site, and "side" is used to indicate that the transmission direction of the signal or data is the third direction sent from user equipment 1 to user equipment 2. For example, "downlink signal" indicates that the transmission direction of the signal is the first direction. In addition, in the embodiment of the present application, the term "and/or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. Specifically, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this article generally indicates that the front and back associated objects are in an "or" relationship.

FIG. 12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, which is applied to a terminal device. As shown in FIG. 12 , the communication device 1200 includes:

The determining unit 1201 is used to determine the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of grant for blind scheduling retransmission of Msg3.

In some embodiments, the communication device 1200 further includes: a communication unit 1202, configured to send Msg1 using determined resources and/or preamble.

In some embodiments, the communication unit 1202 is further used to: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, use the first random access channel opportunity RO and/or the first preamble to send the Msg1.

In some embodiments, the communication unit 1202 is further used to: when the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, use the second RO and/or second preamble to send the Msg1.

In some embodiments, the communication unit 1202 is further configured to:

receiving configuration information of the first RO and/or the first preamble;

receiving configuration information of the second RO and/or the second preamble;

receiving configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble;

Configuration information of a second RACH resource and/or a second preamble set is received; the second RACH resource includes the second RO, and the second preamble set includes the second preamble.

In some embodiments, the determining unit 1201 is further configured to:

Determine the second RO according to the first RO;

Determine the first RO according to the second RO;

Determining the second preamble according to the first preamble;

Determining the first preamble according to the second preamble;

determining the second RACH resource according to the first RACH resource;

determining the first RACH resource according to the second RACH resource;

Determine the second preamble set according to the first preamble set;

The first preamble set is determined according to the second preamble set.

In some embodiments, the first RO and/or the first preamble corresponds to a non-terrestrial communication network NTN; and/or,

The first RACH resource and/or the first preamble set corresponds to the NTN; and/or,

The second RO and/or the second preamble corresponds to NTN; and/or,

The second RACH resource and/or the second preamble set corresponds to the NTN.

In some embodiments, at least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device through a broadcast message or a dedicated signaling of the terminal device; and/or,

At least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device through a broadcast message or a dedicated signaling of the terminal device.

In some embodiments, the determination unit 1201 is further used to: determine the resources and/or preamble used to send the Msg1 according to whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports blind scheduled retransmission grant monitoring of Msg3, and the reference signal measurement result of the terminal device in the current serving cell.

In some embodiments, the communication unit 1202 is further used to: when the terminal device supports blind scheduled retransmission of Msg3 or supports blind scheduled retransmission grant monitoring of Msg3, and the reference signal measurement result is less than or equal to the first threshold, use the first RO and/or the first preamble to send the Msg1.

In some embodiments, the communication unit 1202 is also used to: when the terminal device does not support blind scheduled retransmission of Msg3 or does not support blind scheduled retransmission grant monitoring of Msg3, and/or when the reference signal measurement result is greater than or equal to the first threshold, use the second RO and/or the second preamble to send the Msg1.

In some embodiments, the communication unit 1202 is also used to: when the terminal device supports/requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and when the reference signal measurement result is less than or equal to a second threshold, use the first RO and/or the first preamble to send the Msg1.

In some embodiments, the communication unit 1202 is also used to: when the terminal device supports/requests repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to the second threshold, use the second RO and/or second preamble to send the Msg1.

In some embodiments, the communication unit 1202 is also used to: when the terminal device does not support/does not request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and when the reference signal measurement result is less than or equal to a third threshold, use the first RO and/or the first preamble to send the Msg1.

In some embodiments, the communication unit 1202 is also used to: when the terminal device does not support/does not request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to a third threshold, use a second RO and/or a second preamble to send the Msg1.

In some embodiments, the communication unit 1202 is further used to: receive at least one of the following: a first threshold, a second threshold, and a third threshold.

In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device via a broadcast message or dedicated signaling to the terminal device.

In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered; the multiple characteristics include the first characteristic.

In some embodiments, the communication unit 1202 is further used to: receive the first priority configuration; and/or receive a priority configuration of at least one characteristic other than the first characteristic.

In some embodiments, the second priority is higher than the first priority, or the value of the second priority is lower than the first priority;

The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

In some embodiments, the communication unit 1202 is further used to: when random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or when random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, use a third RO and/or a third preamble to send the Msg1, wherein a third RACH resource includes the third RO, a third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access.

In some embodiments, the communication unit 1202 is further configured to: when random access is applicable to both the first feature and at least one feature other than the first feature or when random access is triggered by the first feature and at least one feature other than the first feature, and there is no third RACH resource and/or a third preamble set for indicating all features that trigger the random access, and there is at least one fourth RACH resource and/or a fourth preamble set for indicating some features among all features that trigger the random access, select a fourth RACH resource and/or a fourth preamble set from at least one fourth RACH resource and/or at least one fourth preamble set according to the first priority and the priority of each feature in the at least one feature, and send the Msg1 using a fourth RO and/or a fourth preamble;

The fourth RO and/or fourth preamble are included in the selected fourth RACH resource and/or a fourth preamble set.

In some embodiments, the communication device 1200 further includes: a monitoring unit 1203, configured to:

When the terminal device uses the first RO and/or the first preamble to send the Msg1, monitor the blind scheduling retransmission grant of Msg3; and/or,

When the terminal device uses the second RO and/or the second preamble to send the Msg1, the blind scheduling retransmission grant of Msg3 is not monitored.

FIG. 13 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application, which is applied to a terminal device. As shown in FIG. 13 , the communication device 1300 includes:

The determination unit 1301 is used to determine whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1.

In some embodiments, the communication device 1300 further includes: a communication unit 1302, configured to: receive Msg1.

In some embodiments, the determination unit 1301 is further used to: when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, determine that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3.

In some embodiments, the determination unit 1301 is further used to: when the Msg1 corresponds to the second RO and/or the second preamble, determine that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3.

In some embodiments, the communication unit 1302 is further configured to:

Sending configuration information of the first RO and/or the first preamble;

Sending configuration information of the second RO and/or the second preamble;

Sending configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble;

Send configuration information of a second RACH resource and/or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble.

In some embodiments, the first RO and/or the first preamble corresponds to a non-terrestrial communication network NTN; and/or,

The first RACH resource and/or the first preamble set corresponds to the NTN; and/or,

The second RO and/or the second preamble corresponds to NTN; and/or,

The second RACH resource and/or the second preamble set corresponds to the NTN.

In some embodiments, the communication unit 1302 is further used to: send a broadcast message or a dedicated signaling of the terminal device;

The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or,

The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set.

In some embodiments, the determination unit 1301 is also used to: when the Msg1 corresponds to the first RO and/or the first preamble, determine that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determine that the reference signal measurement result of the terminal device in the current serving cell is less than or equal to a first threshold.

In some embodiments, the determination unit 1301 is also used to: when the Msg1 corresponds to the second RO and/or the second preamble, determine that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and/or determine that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold.

In some embodiments, the determining unit 1301 is further configured to: when the Msg1 corresponds to the first RO and/or the first preamble, determine one of the following:

The terminal device supports/requests repeated transmission of Msg3, supports blind scheduling retransmission of Msg3, or supports grant monitoring of blind scheduling retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold;

The terminal device does not support/request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3 or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold.

In some embodiments, the determining unit 1301 is further configured to: when the Msg1 corresponds to the second RO and/or the second preamble, determine one of the following:

The terminal device supports/requests repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold;

The terminal device does not support/request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold.

In some embodiments, the communication unit 1302 is further used to: send at least one of the following: a first threshold, a second threshold, and a third threshold.

In some embodiments, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device via a broadcast message or dedicated signaling to the terminal device.

In some embodiments, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3.

In some embodiments, the characteristic priority of the first characteristic corresponding to the blind scheduled retransmission of the Msg3 or the blind scheduled retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered; the multiple characteristics include the first characteristic.

In some embodiments, the communication unit 1302 is further used to: send the first priority configuration; and/or send the priority configuration of at least one characteristic other than the first characteristic.

In some embodiments, the second priority is higher than the first priority, or the value of the second priority is smaller than the first priority; the second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3.

In some embodiments, the determining unit 1301 is further configured to: determine, according to the received Msg1 corresponding to the third RO and/or the third preamble, that the random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or determine that the random access is triggered by the first characteristic and at least one characteristic other than the first characteristic;

The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access.

In some embodiments, the determining unit 1301 is further configured to: determine, according to the fourth RO and/or the fourth preamble corresponding to the received Msg1, that the random access is applicable to some characteristics, or determine that the random access is triggered by some characteristics; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic;

The fourth RO and/or fourth preamble are included in a fourth RACH resource and/or a fourth preamble set;

The one fourth RACH resource and/or one fourth preamble set is selected from at least one fourth RACH resource and/or at least one fourth preamble set;

The at least one fourth RACH resource and/or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access.

In some embodiments, the communication unit 1302 is further configured to: send a blind scheduling retransmission grant of Msg3 when the Msg1 corresponds to the first RO and/or the first preamble.

In some embodiments, the communication unit 1302 is further configured to: when the Msg1 corresponds to the second RO and/or the second preamble, not send a blind scheduling retransmission grant for the Msg3.

Those skilled in the art should understand that the relevant description of the above-mentioned communication device in the embodiment of the present application can be understood by referring to the relevant description of the communication method in the embodiment of the present application.

FIG14 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 1400 may include one of the following: a terminal device or a network device. The communication device 1400 shown in FIG14 may include a processor 1410 and a memory 1420, wherein the memory 1420 is used to store a computer program, and the processor 1410 is used to call and run the computer program stored in the memory 1410, so that the terminal device executes any of the above methods or the network device executes any of the above methods.

Optionally, the memory 1420 may be a separate device from the processor 1410 , or may be integrated into the processor 1410 .

In some embodiments, as shown in FIG. 14 , the communication device 1400 may further include a transceiver 1430 , and the processor 1410 may control the transceiver 1430 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

The transceiver 1430 may include a transmitter and a receiver. The transceiver 1430 may further include an antenna, and the number of antennas may be one or more.

In some embodiments, the communication device 1400 may specifically be a network device of an embodiment of the present application, and the communication device 1400 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

In some embodiments, the communication device 1400 may specifically be a terminal device of an embodiment of the present application, and the communication device 1400 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application, which will not be described herein for the sake of brevity.

An embodiment of the present application further provides a computer storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the communication method in any embodiment of the present application.

In some embodiments, the computer-readable storage medium can be applied to the terminal device or network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

Fig. 15 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 1500 shown in Fig. 15 includes a processor 1510, and the processor 1510 is used to call and run a computer program from a memory to execute a method according to any embodiment of the present application.

In some embodiments, as shown in FIG15 , the chip 1500 may further include a memory 1520. The processor 1510 may call and run a computer program from the memory 1520 to implement the method in the embodiment of the present application.

The memory 1520 may be a separate device independent of the processor 1510 , or may be integrated into the processor 1510 .

In some embodiments, the chip 1500 may further include an input interface 1530. The processor 1510 may control the input interface 1530 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

In some embodiments, the chip 1500 may further include an output interface 1540. The processor 1510 may control the output interface 1540 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

In some embodiments, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

In some embodiments, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

An embodiment of the present application also provides a computer program product, which includes a computer storage medium, the computer storage medium storing a computer program, and the computer program including instructions that can be executed by at least one processor. When the instructions are executed by the at least one processor, the communication method in any embodiment of the present application is implemented.

In some embodiments, the computer program product can be applied to the terminal device or network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

Optionally, the computer program product in the embodiments of the present application may also be referred to as a software product in other embodiments.

An embodiment of the present application also provides a computer program, which enables a computer to execute the communication method in any embodiment of the present application.

In some embodiments, the computer program can be applied to the terminal device or network device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the terminal device or network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

The processor, communication device or chip of the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit in the processor or the instruction in the form of software. The above processor, communication device or chip may include any one or more of the following integrations: general processor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), digital signal processor (Digital Signal Processor, DSP), digital signal processing device (Digital Signal Processing Device, DSPD), programmable logic device (Programmable Logic Device, PLD), field programmable gate array (Field Programmable Gate Array, FPGA), central processing unit (Central Processing Unit, CPU), graphics processing unit (Graphics Processing Unit, GPU), embedded neural network processor (neural-network processing units, NPU), controller, microcontroller, microprocessor, programmable logic device, discrete gate or transistor logic device, discrete hardware component. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It is understood that the memory or computer storage medium in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

It should be understood that the above-mentioned memory or computer storage medium is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (40)

A communication method, the method comprising: The terminal device determines the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports monitoring of the grant for blind scheduling retransmission of Msg3. The method according to claim 1, further comprising: In the case where the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, the terminal device uses the first random access channel opportunity RO and/or the first preamble to send the Msg1; and/or, In the case that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, the terminal device uses the second RO and/or the second preamble to send the Msg1. The method according to claim 2, further comprising at least one of the following: The terminal device receives configuration information of the first RO and/or the first preamble; The terminal device receives configuration information of the second RO and/or the second preamble; The terminal device determines the second RO according to the first RO; The terminal device determines the first RO according to the second RO; The terminal device determines the second preamble according to the first preamble; The terminal device determines the first preamble according to the second preamble; The terminal device receives configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble; The terminal device receives configuration information of a second RACH resource and/or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble; The terminal device determines the second RACH resource according to the first RACH resource; The terminal device determines the first RACH resource according to the second RACH resource; The terminal device determines the second preamble set according to the first preamble set; The terminal device determines the first preamble set according to the second preamble set. The method according to claim 2 or 3, The first RO and/or the first preamble corresponds to a non-terrestrial communication network NTN; and/or, The first RACH resource and/or the first preamble set corresponds to the NTN; and/or, The second RO and/or the second preamble corresponds to NTN; and/or, The second RACH resource and/or the second preamble set corresponds to the NTN. The method according to any one of claims 2 to 4, At least one of the first RO, the first preamble, the second RO, and the second preamble is configured to the terminal device through a broadcast message or a dedicated signaling of the terminal device; and/or, At least one of the first RACH resource, the first preamble set, the second RACH resource, and the second preamble set is configured to the terminal device through a broadcast message or a dedicated signaling of the terminal device. According to the method according to any one of claims 1 to 5, the terminal device determines the resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission authorization grant monitoring of Msg3, including: The terminal device determines the resources and/or preamble used to send the Msg1 according to whether the terminal device supports blind scheduled retransmission of Msg3 or whether it supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell. The method according to claim 6, further comprising: When the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and the reference signal measurement result is less than or equal to the first threshold, the terminal device uses the first RO and/or the first preamble to send the Msg1; and/or, When the terminal device does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or the reference signal measurement result is greater than or equal to the first threshold, the terminal device uses the second RO and/or the second preamble to send the Msg1. The method according to claim 6, further comprising: When the terminal device supports/requests repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to the second threshold, the terminal device uses the first RO and/or the first preamble to send the Msg1; and/or, When the terminal device supports/requests repeated transmission of Msg3 and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or, when the reference signal measurement result is greater than or equal to the second threshold, the terminal device uses the second RO and/or the second preamble to send the Msg1; and/or, When the terminal device does not support/request repeated transmission of Msg3, supports blind scheduled retransmission of Msg3, or supports grant monitoring of blind scheduled retransmission of Msg3, and the reference signal measurement result is less than or equal to the third threshold, the terminal device uses the first RO and/or the first preamble to send the Msg1; and/or, When the terminal device does not support/request repeated transmission of Msg3, and does not support blind scheduled retransmission of Msg3 or does not support grant monitoring of blind scheduled retransmission of Msg3, and/or when the reference signal measurement result is greater than or equal to the third threshold, the terminal device uses the second RO and/or the second preamble to send the Msg1. The method according to claim 7 or 8, further comprising: The terminal device receives at least one of the following: a first threshold, a second threshold, and a third threshold. According to the method described in any one of claims 7 to 9, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device via a broadcast message or dedicated signaling to the terminal device. According to the method described in any one of claims 7, 9, and 10, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. According to the method described in any one of claims 1 to 11, the characteristic priority of the first characteristic corresponding to the blind scheduling retransmission of the Msg3 or the blind scheduling retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered; the multiple characteristics include the first characteristic. The method according to claim 12, further comprising: The terminal device receives the first priority configuration; and/or, The terminal device receives a priority configuration of at least one characteristic other than the first characteristic. According to the method of claim 12 or 13, the second priority is higher than the first priority, or the value of the second priority is lower than the first priority; The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3. The method according to any one of claims 12 to 14, further comprising: In the case where random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or in the case where random access is triggered by the first characteristic and at least one characteristic other than the first characteristic, the terminal device sends the Msg1 using a third RO and/or a third preamble, wherein a third RACH resource includes the third RO, a third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access. The method according to any one of claims 12 to 15, further comprising: When random access is applicable to both the first feature and at least one feature other than the first feature, or when random access is triggered by the first feature and at least one feature other than the first feature, and there is no third RACH resource and/or a third preamble set for indicating all features that trigger the random access, and there is at least one fourth RACH resource and/or a fourth preamble set for indicating some features among all features that trigger the random access, the terminal device selects a fourth RACH resource and/or a fourth preamble set from at least one fourth RACH resource and/or at least one fourth preamble set according to the first priority and the priority of each feature in the at least one feature, and uses a fourth RO and/or a fourth preamble to send the Msg1; The fourth RO and/or fourth preamble are included in the selected fourth RACH resource and/or a fourth preamble set. The method according to any one of claims 1 to 16, further comprising: In the case where the terminal device uses the first RO and/or the first preamble to send the Msg1, the terminal device monitors the blind scheduling retransmission grant of Msg3; and/or, In the case where the terminal device uses the second RO and/or the second preamble to send the Msg1, the terminal device does not monitor the blind scheduling retransmission grant of Msg3. A communication method, the method comprising: The network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1. According to the method of claim 18, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports grant monitoring of blind scheduling retransmission of Msg3 according to the resources and/or preamble corresponding to the received Msg1, comprising: In the case where the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3; and/or, In the case that the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3. The method according to claim 19, further comprising at least one of the following: The network device sends configuration information of the first RO and/or the first preamble; The network device sends configuration information of the second RO and/or the second preamble; The network device sends configuration information of a first random access channel RACH resource and/or a first preamble set; the first RACH resource includes the first RO, and the first preamble set includes the first preamble; The network device sends configuration information of a second RACH resource and/or a second preamble set; the second RACH resource includes the second RO, and the second preamble set includes the second preamble. The method according to claim 19 or 20, The first RO and/or the first preamble corresponds to a non-terrestrial communication network NTN; and/or, The first RACH resource and/or the first preamble set corresponds to the NTN; and/or, The second RO and/or the second preamble corresponds to NTN; and/or, The second RACH resource and/or the second preamble set corresponds to the NTN. The method according to any one of claims 19 to 21, further comprising: The network device sends a broadcast message or a dedicated signaling of the terminal device; The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: the first RO, the first preamble, the second RO, the second preamble, or, The broadcast message or the terminal device dedicated signaling includes or indicates at least one of the following: a first RACH resource, a first preamble set, a second RACH resource, and a second preamble set. According to the method according to any one of claims 19 to 22, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including: In a case where the Msg1 corresponds to the first RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, and determines that a reference signal measurement result of the terminal device in the current serving cell is less than or equal to a first threshold; In the case where the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including: When the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, and/or determines that the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the first threshold. According to the method according to any one of claims 19 to 22, when the Msg1 corresponds to the first random access channel opportunity RO and/or the first preamble, the network device determines that the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3, including: In a case where the Msg1 corresponds to the first RO and/or the first preamble, the network device determines one of the following: The terminal device supports/requests repeated transmission of Msg3, supports blind scheduling retransmission of Msg3, or supports grant monitoring of blind scheduling retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the second threshold; The terminal device does not support/does not request repeated transmission of Msg3, supports blind scheduling retransmission of Msg3 or supports grant monitoring of blind scheduling retransmission of Msg3, and the reference signal measurement result of the terminal device in the current serving cell is less than or equal to the third threshold; In the case where the Msg1 corresponds to the second RO and/or the second preamble, the network device determines that the terminal device does not support blind scheduling retransmission of Msg3 or does not support blind scheduling retransmission grant monitoring of Msg3, including: In the case where the Msg1 corresponds to the second RO and/or the second preamble, the network device determines one of the following: The terminal device supports/requests repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the second threshold; The terminal device does not support/request repeated transmission of Msg3, and does not support blind scheduling retransmission of Msg3 or does not support grant monitoring of blind scheduling retransmission of Msg3, and/or the reference signal measurement result of the terminal device in the current serving cell is greater than or equal to the third threshold. The method according to claim 23 or 24, further comprising: The network device sends at least one of the following: a first threshold, a second threshold, and a third threshold. According to the method described in any one of claims 23 to 25, at least one of the first threshold, the second threshold, and the third threshold is a predefined threshold, or a threshold specified by a protocol, or is configured to the terminal device via a broadcast message or dedicated signaling to the terminal device. According to the method described in any one of claims 23, 25, and 26, the first threshold is a threshold used by the terminal device to determine whether to request repeated transmission of Msg3. According to the method described in any one of claims 18 to 27, the characteristic priority of the first characteristic corresponding to the blind scheduling retransmission of the Msg3 or the blind scheduling retransmission grant monitoring of the Msg3 is the first priority; the first priority is used to determine the resources and/or preamble used to send the Msg1 in the case of random access to which multiple characteristics are applicable/triggered; the multiple characteristics include the first characteristic. The method according to claim 28, further comprising: The network device sends the first priority configuration; and/or, The network device sends a priority configuration of at least one characteristic other than the first characteristic. According to the method of claim 28 or 29, the second priority is higher than the first priority, or the value of the second priority is lower than the first priority; The second priority is the characteristic priority of the second characteristic corresponding to the repeated transmission of Msg3. According to the method according to any one of claims 28 to 30, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1, including: The network device determines, according to the third RO and/or the third preamble corresponding to the received Msg1, that random access is applicable to both the first characteristic and at least one characteristic other than the first characteristic, or determines that random access is triggered by the first characteristic and at least one characteristic other than the first characteristic; The third RACH resource includes the third RO, the third preamble set includes the third preamble, and the third RACH resource and/or the third preamble set are used to indicate all characteristics that trigger the random access. According to the method according to any one of claims 28 to 31, the network device determines whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to the resources and/or preamble corresponding to the received Msg1, including: The network device determines, according to the received Msg1 corresponding to the fourth RO and/or the fourth preamble, that random access is applicable to some characteristics, or determines that random access is triggered by some characteristics; the some characteristics are a subset of all characteristics, and all characteristics include the first characteristic and at least one characteristic other than the first characteristic; The fourth RO and/or fourth preamble are included in a fourth RACH resource and/or a fourth preamble set; The one fourth RACH resource and/or one fourth preamble set is selected from at least one fourth RACH resource and/or at least one fourth preamble set; The at least one fourth RACH resource and/or the at least one fourth preamble set are used to indicate some of all characteristics that trigger the random access. The method according to any one of claims 18 to 32, further comprising: In the case where the Msg1 corresponds to the first RO and/or the first preamble, the network device sends a blind scheduling retransmission grant of Msg3; and/or, In the case that the Msg1 corresponds to the second RO and/or the second preamble, the network device does not send the blind scheduling retransmission grant of the Msg3. A communication device includes: a determining unit, used to determine resources and/or preamble for sending Msg1 according to whether the terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3. A communication device includes: a determination unit, which is used to determine whether a terminal device supports blind scheduling retransmission of Msg3 or supports blind scheduling retransmission grant monitoring of Msg3 according to resources and/or preamble corresponding to a received Msg1. A communication device comprises: a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that a terminal device executes the method described in any one of claims 1 to 17 or a network device executes the method described in any one of claims 18 to 33. A computer storage medium storing one or more programs, wherein the one or more programs can be executed by one or more processors to implement the method described in any one of claims 1 to 17 or any one of claims 18 to 33. A chip, comprising: a processor, configured to call and run a computer program from a memory to execute a method as claimed in any one of claims 1 to 17 or any one of claims 18 to 33. A computer program product, comprising a computer storage medium storing a computer program, wherein the computer program comprises instructions executable by at least one processor, and when the instructions are executed by the at least one processor, the method described in any one of claims 1 to 17 or any one of claims 18 to 33 is implemented. A computer program, which enables a computer to execute the method according to any one of claims 1 to 17 or any one of claims 18 to 33.

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