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WO2018141126A1 - Procédé de transmission pour signal de référence de sondage de canal, terminal et station de base - Google Patents

Procédé de transmission pour signal de référence de sondage de canal, terminal et station de base Download PDF

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Publication number
WO2018141126A1
WO2018141126A1 PCT/CN2017/078202 CN2017078202W WO2018141126A1 WO 2018141126 A1 WO2018141126 A1 WO 2018141126A1 CN 2017078202 W CN2017078202 W CN 2017078202W WO 2018141126 A1 WO2018141126 A1 WO 2018141126A1
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WIPO (PCT)
Prior art keywords
terminal
reference signal
domain resource
time
resources
Prior art date
Application number
PCT/CN2017/078202
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English (en)
Chinese (zh)
Inventor
刘云
王键
王达
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华为技术有限公司
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Publication date
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Publication of WO2018141126A1 publication Critical patent/WO2018141126A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a method, a terminal, and a base station for transmitting a channel sounding reference signal.
  • 5th-Generation (5G) mobile communication technology The new air interface communication protocol (5G New Radio, 5G NR) is a newly proposed topic in the 3rd Generation Partnership Project (3GPP) organization. Release 14 in the release.
  • 3GPP 3rd Generation Partnership Project
  • 4G 4th-Generation
  • 4G 4th-Generation
  • China Mobile, China Unicom, and China Telecom all use 4G LTE Time Division Duplexing (TDD) mode and Frequency Division Duplexing (FDD) mode transmission technology, and are widely used by users. Provides high speed and convenient mobile network services.
  • TDD Time Division Duplexing
  • FDD Frequency Division Duplexing
  • the self-contained subframe structure includes three parts.
  • the first part is Downlink (DL) control information, that is, downlink control information, which can transmit DL grant information or uplink (UL) grant ( Grant information, which is used to tell the user equipment (User Equipment, UE) resources how to configure.
  • DL Downlink
  • UL uplink
  • Grant information which is used to tell the user equipment (User Equipment, UE) resources how to configure.
  • the second part is a data part, and the downlink data may be transmitted by an evolved Node B (eNB) or a generation node B (gNB), or the UE transmits uplink data according to resources allocated by the previous UL grant.
  • the third part is the UL control, that is, the uplink control information.
  • the UE can reply Acknowledge (ACK) or Negative acknowledge (NACK) to the previous downlink data, or transmit the uplink channel state information (Channel State). Information, CSI) to assist the eNB or gNB for subsequent scheduling use.
  • CSI Uplink channel state information
  • the UL control portion is occupied by UL data.
  • a self-contained subframe that transmits downlink data is referred to as a downlink-based self-contained subframe
  • a self-contained subframe that transmits uplink data is referred to as an uplink-based self-contained subframe.
  • the eNB tells the UE which resources the eNB will transmit downlink data. Then, after the DL grant is transmitted, the downlink data is transmitted; after the downlink data transmission is completed, a guard interval is passed. Period, GP), the UE replies an ACK or a NACK according to the result of decoding the downlink data; in the uplink-based self-contained subframe, there are two cases: when the eNB allocates the remaining time of the entire subframe to the UE to transmit the uplink data. The UE performs the uplink data transmission after the GP until the end of the subframe. In another case, the eNB allocates only the data part for the uplink transmission of the UE. At this time, after the GP, the UE transmits the uplink according to the resource allocated in the UL grant. Data, and after the end of the transmission, the scheduled UE transmits uplink control information, such as CSI.
  • uplink control information such as CSI.
  • the single-signal UL control passed in the conference because the duration is small, the transmitted energy is small, and the receiving end is required to be closer to the transmitting end, so the coverage is small.
  • the Sounding Reference Signal is sent by the UE to the eNB for the eNB to measure the channel quality.
  • the channel sounding reference signal is divided into two types: periodic transmission and non-periodic transmission.
  • the periodic transmission is performed.
  • the eNB determines the period and informs the UE to send the channel sounding reference signal once every period.
  • the aperiodic transmission is performed by the eNB.
  • the UE transmits an uplink control reference signal in a certain frequency band. Since one of the design themes of 5G NR is to reduce the overhead of periodic signals, in the future design of 5G NR, it is very likely that SRS transmission will be scheduled in an acyclic manner.
  • the existing SRS transmission mode is as shown in FIG. 2.
  • SRS is divided into two modes: non-frequency hopping and frequency hopping.
  • the SRS occupies one symbol of the subframe and transmits over the entire frequency band. At this time, other UEs cannot perform uplink control transmission on this symbol to avoid mutual interference; in the frequency hopping transmission mode
  • the SRS is transmitted in multiple subframes. Each time a certain UE transmits SRS only on a certain segment of the frequency band, combining SRS information on multiple frequency bands, the eNB can acquire the channel quality of the entire frequency band.
  • the transmission mode of frequency hopping when the SRS is transmitted, other UEs cannot perform uplink control transmission on this symbol.
  • the prior art is directed to a coexistence scheme of an uplink control signal and an SRS of up to 14 symbols in an LTE system. If one symbol is used for transmitting the SRS, 13 symbols can still transmit an uplink control signal. In the 5G NR, it is very possible to use a single symbol or a small number of SRSs. Unlike the existing LTE system, for the uplink control of a single symbol, if one symbol is used for transmitting the SRS, the entire subframe or time slot is used. There is no resource to transmit the uplink control signal.
  • the embodiment of the present invention provides a method for transmitting a channel sounding reference signal, a terminal, and a base station, which are used to implement short-time uplink control and mixed transmission of SRS.
  • an embodiment of the present invention provides a method for transmitting a channel sounding reference signal, where a first terminal receives an indication message from a base station, and the first terminal uses a first sequence to transmit a channel sounding reference signal according to the indication message, and the channel sounding reference signal is occupied. All or part of the resources of the time-frequency resource belong to the time-frequency resource occupied by the uplink control signal of the second terminal.
  • the first terminal sends a channel sounding reference signal to multiplex the time-frequency resources occupied by the uplink control signal of the second terminal, so as to implement short-time uplink control and SRS mixing. transmission.
  • the indication message carries the first terminal to send a channel sounding reference signal
  • the first terminal sequence is determined according to the code domain resource information carried in the indication message; the first terminal uses the first sequence to send a channel sounding reference signal.
  • the first terminal may determine, according to the indication of the base station, a sequence for transmitting the channel sounding reference signal, and effectively ensure that the sequence used by the first terminal to send the channel sounding reference signal and the second terminal are used to send the uplink control signal.
  • the sequence is orthogonal. Therefore, when the first terminal sends the channel sounding reference signal to multiplex the time-frequency resource of the second terminal to send the uplink control signal, it can ensure that the two do not interfere with each other.
  • the code domain resource is divided into a first group of code domain resources and a second group of code domain resources, wherein the sequence in the first group of code domain resources and the second group of code domain resources
  • the sequence in the first terminal transmits the channel sounding reference signal using a sequence in the first group of code domain resources; and the second terminal transmits the uplink control signal by using the second group code domain resource The sequence in .
  • the code domain resources are grouped in advance, and the code domain resources are divided into a code domain resource for transmitting a channel sounding reference signal and a code domain resource for transmitting an uplink control signal, thereby ensuring a transmission channel sounding reference signal and
  • the uplink control signal is sent by using different code domain resources, and the terminal can select the code domain resource according to the agreed mode, reduce signaling transmission between the terminal and the base station, and save signaling overhead.
  • the indication message carries time domain resource information and/or frequency domain resource information that is used by the first terminal to send the channel sounding reference signal.
  • the first terminal determines a first sequence according to the indication message, where the first sequence belongs to a sequence in the first group of code domain resources;
  • the first sequence transmits a channel sounding reference signal.
  • the uplink control signal includes uplink control information and a demodulation reference signal; all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to an uplink control of the second terminal.
  • the time-frequency resource occupied by the information and/or the time-frequency resource occupied by the demodulation reference signal is not limited to uplink control of the second terminal.
  • the ratio of the uplink control information and the demodulation reference signal occupying subcarriers is 1:1, and all resources or partial resources of the time-frequency resources occupied by the channel sounding reference signals belong to the The time-frequency resource occupied by the uplink control information of the second terminal and/or the time-frequency resource occupied by the demodulation reference signal; or the ratio of the uplink control information and the demodulation reference signal occupying the subcarrier is x: 1 , where x is an integer and x>1, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to a time-frequency resource occupied by the demodulation reference signal of the second terminal.
  • the single-carrier characteristic of the channel sounding reference signal can be ensured by maintaining a constant frequency domain interval of the frequency domain subcarrier in which the channel sounding reference signal is located.
  • an embodiment of the present invention provides a method for transmitting a channel sounding reference signal, where the base station sends an indication message to the first terminal, where the indication message is used to instruct the first terminal to use the first sequence to send a channel sounding reference signal, and the channel sounding reference All resources or part of resources of the time-frequency resource occupied by the signal belong to the time-frequency resource occupied by the uplink control signal of the second terminal.
  • the base station controls the first terminal to send the channel sounding reference signal to multiplex the time-frequency resources occupied by the uplink control signal of the second terminal, thereby implementing the short-term uplink control and the SRS. Mixed transmission.
  • the indication message carries code domain resource information that is used by the first terminal to send a channel sounding reference signal, and the indication message is further used to indicate that the first terminal is according to the code domain.
  • the resource information determines the first sequence.
  • the code domain resource is divided into a first group of code domain resources and a second group of code domain resources, where The sequence in the first group of code domain resources is different from the sequence in the second group of code domain resources; the first terminal transmits the channel sounding reference signal by using a sequence in the first group of code domain resources; And transmitting, by the second terminal, the uplink control signal by using a sequence in the second group of code domain resources.
  • the indication message carries time domain resource information and/or frequency domain resource information that is used by the first terminal to send the channel sounding reference signal.
  • the indication message is further used to indicate that the first terminal determines the first sequence according to the indication message, where the first sequence belongs to the first group of code domain resources. sequence.
  • the uplink control signal includes uplink control information and a demodulation reference signal; all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to an uplink control of the second terminal.
  • the time-frequency resource occupied by the information and/or the time-frequency resource occupied by the demodulation reference signal is not limited to uplink control of the second terminal.
  • the ratio of the uplink control information and the demodulation reference signal occupying subcarriers is 1:1, and all resources or partial resources of the time-frequency resources occupied by the channel sounding reference signals belong to the The time-frequency resource occupied by the uplink control information of the second terminal and/or the time-frequency resource occupied by the demodulation reference signal; or the ratio of the uplink control information and the demodulation reference signal occupying the subcarrier is x: 1 , where x is an integer and x>1, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to a time-frequency resource occupied by the demodulation reference signal of the second terminal.
  • an embodiment of the present invention provides a method for transmitting a channel sounding reference signal, where a first terminal receives an indication message from a base station, and the first terminal uses a first frequency domain resource to transmit a channel sounding reference signal according to the indication message, and the channel sounding reference is used.
  • the signal and the uplink control signal of the second terminal occupy different frequency domain resources on the same time domain resource.
  • the first terminal sends different frequency domain resources occupied by the channel sounding reference signal and the uplink control signal of the second terminal by using the frequency domain resource, so as to realize short-time uplink control and SRS mixing. transmission.
  • the channel sounding reference signal occupies a group of consecutive subcarriers on the same time domain resource, where the same time domain resource includes multiple uplink transmission symbols; or, the channel sounding The reference signal occupies a set of discrete, fixedly spaced subcarriers on the same time domain resource, the same time domain resource including an uplink transmission symbol.
  • the indication message is used to indicate that the first terminal sends the sequence used by the channel sounding reference signal and at least one of an occupied physical resource block and an initial subcarrier number.
  • the embodiment of the present invention provides a method for transmitting a channel sounding reference signal, where the base station sends a first indication message to the first terminal, where the first indication message is used to indicate that the first terminal is in the first time domain resource and the first The frequency domain resource sends a channel sounding reference signal; the base station sends a second indication message to the second terminal; the second indication message is used to indicate that the second terminal sends the uplink control signal in the first time domain resource and the second frequency domain resource; The domain resource is different from the second frequency domain resource.
  • the base station controls the first terminal to send different frequency domain resources occupied by the channel sounding reference signal and the uplink control signal of the second terminal, thereby implementing short duration uplink control and SRS. Mixed transmission.
  • the channel sounding reference signal occupies a set of consecutive subcarriers on the first time domain resource, where the first time domain resource includes multiple uplink transmission symbols; or
  • the channel sounding reference signal occupies a set of discrete fixed interval subcarriers on the first time domain resource, and the first time domain resource includes an uplink Transfer symbol.
  • the first indication message is further used to indicate that the first terminal sends the sequence of the channel sounding reference signal and at least one of an occupied physical resource block and an initial subcarrier number.
  • the second indication message is further used to indicate that the second terminal sends the sequence used by the uplink control signal and at least one of the occupied physical resource block and the initial subcarrier number.
  • the second indication message is further used to indicate a power allocation manner of the second terminal to send an uplink control signal, where the power allocation manner is used to indicate that the second terminal allocates power to Uplink control information and demodulation reference signal; or, the power allocation mode is used to instruct the second terminal to allocate power to the demodulation reference signal.
  • the uplink control signal is allocated to the remaining occupied frequency domain resources for power boosting, which can effectively improve the uplink. The transmission distance of the control signal.
  • an embodiment of the present invention provides a method for transmitting a channel sounding reference signal, where the base station sends a first indication message to the first terminal, where the first indication message is used to indicate that the first terminal is in the first time domain resource transmission channel detection.
  • the reference signal is sent by the base station to the second terminal, where the second indication message is used to indicate that the second terminal sends the uplink control signal in the second time domain resource; the first time domain resource is different from the second time domain resource.
  • the base station controls the first terminal to send different time domain resources occupied by the channel sounding reference signal and the uplink control signal of the second terminal, thereby implementing short duration uplink control and SRS. Mixed transmission.
  • the second time domain resource is a next subframe or a time slot of the first time domain resource.
  • the base station schedules a symbol position where the downlink transmission ends, and the first time domain resource is located before the second time domain resource in one subframe or time slot.
  • the base station schedules a symbol position of a downlink transmission end and/or a time domain position of an uplink control signal, where the first time domain resource is located in the second time domain resource in one subframe. after that.
  • the first indication message is further used to indicate that the first terminal transmits the channel sounding reference signal on consecutive symbols, where the channel sounding reference signal occupies the plurality of symbols Part of the frequency band of each symbol.
  • the base station separates the multiple symbols over a length of time of an original symbol by increasing the subcarrier width.
  • the embodiment of the present invention provides a terminal, where the terminal can implement the functions performed by the first terminal in the foregoing first and/or third method examples, where the function can be implemented by hardware or by The hardware implements the corresponding software implementation.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the structure of the terminal includes a processor and a communication interface configured to support the terminal to perform corresponding functions in the above methods.
  • the communication interface is used to support communication between the terminal and a base station or other network elements.
  • the terminal can also include a memory for coupling with the processor that retains the program instructions and data necessary for the terminal.
  • the embodiment of the present invention provides a base station, where the base station can implement the functions performed by the base station in the foregoing second aspect and/or the fourth aspect and/or the fifth aspect of the method embodiment, where the function can be implemented by using hardware.
  • Implementation you can also implement the corresponding software implementation through hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the base station includes a processor and a communication interface configured to support the base station in performing the corresponding functions of the above methods.
  • the communication interface is used to support communication between the base station and a terminal or other network element.
  • the network device can also include a memory for coupling with the processor that holds the necessary program instructions and data for the base station.
  • an embodiment of the present invention provides a communication system, including the terminal and the base station in the foregoing aspect.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the terminal, including a program designed to execute the first aspect and/or the third aspect.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use by the base station, including the second aspect and/or the fourth aspect and/or the fifth aspect. Designed program.
  • 1 is a schematic diagram of a self-contained subframe structure proposed by a 5G NR;
  • FIG. 2 is a schematic diagram of a conventional SRS transmission mode
  • FIG. 3 is a signal flow diagram of a method for transmitting a channel sounding reference signal according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a reserved code domain resource transmission SRS according to an embodiment of the present invention.
  • FIG. 5 is a signal flow diagram of another method for transmitting a channel sounding reference signal according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a reserved subcarrier transmission SRS according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of a reserved PRB transmission SRS according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a reserved PRB transmission SRS according to an embodiment of the present disclosure.
  • FIG. 9 is a signal flow diagram of still another method for transmitting a channel sounding reference signal according to an embodiment of the present invention.
  • 10 is a schematic diagram of a reserved time domain resource transmission SRS of mode one
  • 11 is a schematic diagram of a reserved time domain resource transmission SRS of mode 2;
  • 12 is a schematic diagram of a reserved time domain resource transmission SRS of mode three.
  • 13 is a schematic diagram of multiple symbol transmission SRSs of one slot or subframe of mode 4.
  • FIG. 15 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram of another terminal according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 18 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • An application scenario addressed by the embodiment of the present invention is short duration uplink control in a 5G NR.
  • the uplink control can transmit one symbol less, but the short duration uplink control in the 5G NR may have only one or a few symbols. If the symbol is reserved for the SRS, the overhead is relatively large.
  • the embodiment of the present invention provides a method for transmitting a channel sounding reference signal, which is used to implement a hybrid transmission of short duration uplink control and SRS, wherein the channel sounding reference signal is SRS.
  • Embodiments of the present invention are directed to a scheme design of short duration uplink control and SRS hybrid transmission.
  • the SRS is transmitted by using the reserved code domain resource, that is, the short-length uplink control and the SRS are transmitted by using code division multiplexing.
  • Scheme 2 uses the method of reserving the frequency domain resources to transmit the SRS, that is, occupying one frequency domain subcarrier or a certain PRB of the short duration uplink control; in order to save the delay of transmitting the entire frequency band, the joint before and after the two a time slot or a manner in which a plurality of symbols are provided in one time slot for transmitting an SRS;
  • Solution 3 uses a method of reserving SRS by reserving time domain resources.
  • FIG. 3 is a signal flow diagram of a method for transmitting a channel sounding reference signal according to an embodiment of the present invention.
  • a method for transmitting an SRS by using a reserved code domain resource is used. Referring to FIG. 3, the method includes:
  • Step 301 The base station sends an indication message to the first terminal.
  • the indication message is used to indicate that the first terminal sends a channel sounding reference signal by using a first sequence, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to an uplink control signal of the second terminal. Frequency resources.
  • the indication message carries code domain resource information that is used by the first terminal to send a channel sounding reference signal, and the indication message is further used to indicate that the first terminal determines, according to the code domain resource information, The first sequence is described.
  • the code domain resources are divided into a first set of code domain resources and a second set of code domain resources, wherein the sequence in the first set of code domain resources is different from the sequence in the second set of code domain resources
  • the first terminal transmits the channel sounding reference signal using a sequence in the first group of code domain resources; and the second terminal transmits the uplink control signal to use a sequence in the second group of code domain resources.
  • the indication message carries time domain resource information and/or frequency domain resource information occupied by the first terminal to send the channel sounding reference signal.
  • the indication message is further used to indicate that the first terminal determines the first sequence according to the indication message, where the first sequence belongs to a sequence in the first group of code domain resources.
  • the uplink control signal includes uplink control information and a demodulation reference signal; when all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to the uplink control information of the second terminal Frequency resources and/or time-frequency resources occupied by the demodulation reference signals.
  • the ratio of the uplink control information and the demodulation reference signal occupying subcarriers is 1:1, and all resources or partial resources of the time-frequency resources occupied by the channel sounding reference signals belong to the second terminal.
  • the time-frequency resource occupied by the uplink control information and/or the time-frequency resource occupied by the demodulation reference signal; or the ratio of the uplink control information and the demodulation reference signal occupying the subcarrier is x:1, where x is an integer and x>1, and all resources or partial resources of the time-frequency resource occupied by the channel sounding reference signal belong to the demodulation reference signal of the second terminal. Time-frequency resources used.
  • Step 302 The first terminal sends a channel sounding reference signal according to the indication message, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to a time-frequency resource occupied by the uplink control signal of the second terminal.
  • the indication message carries the code domain resource information that is used by the first terminal to send the channel sounding reference signal; the first terminal determines the code according to the code domain resource information carried in the indication message. a first sequence; the first terminal transmits a channel sounding reference signal using the first sequence.
  • the code domain resources are divided into a first set of code domain resources and a second set of code domain resources, wherein the sequence in the first set of code domain resources is different from the sequence in the second set of code domain resources
  • the first terminal transmits the channel sounding reference signal using a sequence in the first group of code domain resources; and the second terminal transmits the uplink control signal to use a sequence in the second group of code domain resources.
  • the indication message carries time domain resource information and/or frequency domain resource information occupied by the first terminal to send the channel sounding reference signal.
  • the first terminal determines a first sequence according to the indication message, the first sequence belongs to a sequence in the first group of code domain resources; the first terminal sends by using the first sequence Channel sounding reference signal.
  • the uplink control signal includes uplink control information and a demodulation reference signal; when all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to the uplink control information of the second terminal Frequency resources and/or time-frequency resources occupied by the demodulation reference signals.
  • the ratio of the uplink control information and the demodulation reference signal occupying subcarriers is 1:1, and all resources or partial resources of the time-frequency resources occupied by the channel sounding reference signals belong to the second terminal.
  • the time-frequency resource occupied by the uplink control information and/or the time-frequency resource occupied by the demodulation reference signal; or the ratio of the uplink control information and the demodulation reference signal occupying the subcarrier is x:1, where x is an integer and x>1, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to the time-frequency resource occupied by the demodulation reference signal of the second terminal.
  • the method for transmitting the SRS by using the reserved code domain resource is adopted, so that the first terminal sends the channel sounding reference signal by using the first sequence, and all resources or part of resources of the time-frequency resource occupied by the channel sounding reference signal belong to the second terminal.
  • the time-frequency resources occupied by the uplink control signals enable hybrid transmission of short-term uplink control and SRS.
  • the short-term uplink control may occupy all physical resource blocks (PRBs) of one bandwidth or a part of PRBs transmit uplink control signaling.
  • the physical resource block is composed of 12 consecutive subcarriers in the frequency domain on a time domain symbol, and the uplink control signaling may also be referred to as an uplink control signal.
  • the uplink control signaling includes uplink control information (UCI) and a demodulated reference signal (DMRS), wherein the uplink control information and the demodulation reference signal may be transmitted by using frequency division multiplexing, such as Figure 4 shows.
  • the uplink control information and the demodulation reference signal are respectively spread-spread by the spreading sequence.
  • the SRS needs to use a spreading sequence orthogonal to the uplink control information or the spreading sequence used by the demodulation reference signal for spreading.
  • the frequency domain subcarrier in which the SRS is located needs to maintain a constant frequency domain interval. For example, if the interval of adjacent subcarriers occupied by the SRS is 2 subcarriers, the SRS is selected. The carrier number must meet the interval requirement. Starting from the initial subcarrier, on every subcarrier of 2 subcarriers, the SRS is on the subcarrier. Transfer.
  • the spreading sequence used for the SRS transmission and the frequency domain subcarrier used by the SRS may be implicitly performed by the base station by using Radio Resource Control (RRC) signaling or Downlink Control Information (DCI). Or explicit instructions.
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the transmission of the SRS may measure the channel quality within the allocated bandwidth. If the allocated bandwidth does not occupy the entire spectrum, the SRS needs to jointly measure the channel quality of the entire bandwidth by combining the multiple symbols. That is, in some bandwidths, the SRS occupies Code Division Multiplexing (CDM) resource transmission on the PRB occupied by the short-length uplink control on the bandwidth; on other bandwidths, the SRS has short-term uplink control on these bandwidths.
  • CDM Code Division Multiplexing
  • the number of frequency bands allocated to the UE is N PRBs, wherein UCI and DMRS respectively occupy one subcarrier, and UCI and DMRS respectively perform spread spectrum transmission using a spreading sequence.
  • N PRBs there are 6N code domain resources for multiple UEs to transmit UCI and DMRS.
  • the gNB may reserve one or several code domain resources to the SRS, and the reservation manner may be used to transmit uplink control to any UE by using or not allocating these code domain resources in an implicit standard, or by an explicit RRC or DCI letter. Let the UE be instructed to use the code domain resource for SRS uplink transmission.
  • the base station on the frequency domain subcarrier corresponding to the UCI, allocates a code domain resource to the UE to transmit the SRS.
  • the UE spreads the signal to be transmitted on the symbol by using a spreading sequence corresponding to the code domain resource, and transmits the signal. Since the spreading sequence used by the SRS is orthogonal to the spreading sequence used by the UCI of other UEs, the SRS signal and the UCI transmissions of other UEs do not interfere with each other.
  • the base station On the frequency domain subcarrier corresponding to the DMRS, allocates a code domain resource to the UE to transmit the SRS.
  • the UE spreads the signal to be transmitted on the symbol by using a spreading sequence corresponding to the allocated code domain resource, and transmits the signal. Since the spreading sequence used by the SRS is orthogonal to the spreading sequence used by the DMRS of other UEs, the SRS signal and the DMRS transmissions of other UEs do not interfere with each other.
  • the number of frequency bands allocated to the UE is N PRBs, wherein the UCI and the DMRS respectively occupy two subcarriers and one subcarrier, and the UCI and the DMRS respectively perform spread spectrum transmission using a spreading sequence.
  • N PRBs there are 4N code domain resources for multiple UEs to transmit DMRS.
  • the gNB may reserve one or several code domain resources to the SRS, and the reservation manner may be used to transmit uplink control to any UE by using or not allocating these code domain resources in an implicit standard, or by an explicit RRC or DCI letter. Let the UE be instructed to use the code domain resource for SRS uplink transmission.
  • the base station on the frequency domain subcarrier corresponding to the DMRS, allocates a code domain resource to the UE to transmit the SRS.
  • the UE spreads the signal to be transmitted on the symbol by using a spreading sequence corresponding to the allocated code domain resource, and transmits the signal. Since the spreading sequence used by the SRS is orthogonal to the spreading sequence used by the DMRS of other UEs, the SRS signal and the DMRS transmissions of other UEs do not interfere with each other.
  • the SRS transmission can still be multiplexed with the DMRS.
  • FIG. 5 is a signal flow diagram of another method for transmitting a channel sounding reference signal according to an embodiment of the present invention.
  • a manner of using a reserved frequency domain resource to transmit an SRS is used. Referring to FIG. 5, the method includes:
  • Step 501 The base station sends a first indication message to the first terminal.
  • the first indication message is used to indicate that the first terminal sends a channel in the first time domain resource and the first frequency domain resource Probe reference signal.
  • Step 502 The base station sends a second indication message to the second terminal.
  • the second indication message is used to indicate that the second terminal sends an uplink control signal in the first time domain resource and the second frequency domain resource.
  • the first frequency domain resource is different from the second frequency domain resource.
  • the sequence of the steps 501 and 502 is not limited.
  • the step 501 may be performed before the step 502 is performed, or the step 502 may be performed first, and then the step 501 and the step 502 may be performed at the same time.
  • the first frequency domain resource may be different from the second frequency domain resource.
  • the channel sounding reference signal occupies a set of consecutive subcarriers on the first time domain resource.
  • the first time domain resource includes a plurality of uplink transmission symbols; in another example, the channel sounding reference signal occupies a set of discrete fixed interval subcarriers on the first time domain resource, the first The time domain resource includes an upstream transmission symbol.
  • the first indication message is further used to indicate that the first terminal sends the sequence used by the channel sounding reference signal and at least one of an occupied physical resource block and an initial subcarrier number.
  • the second indication message is further used to indicate that the second terminal sends the sequence used by the uplink control signal and at least one of the occupied physical resource block and the initial subcarrier number.
  • the second indication message is further used to indicate a power allocation manner of the second terminal to send an uplink control signal, where the power allocation manner is used to indicate that the second terminal allocates power to uplink control information and Demodulating the reference signal; or the power allocation mode is used to instruct the second terminal to allocate power to the demodulation reference signal.
  • Step 503 The first terminal sends the channel sounding reference signal by using the first time domain resource and the first frequency domain resource according to the first indication message.
  • Step 504 The second terminal sends an uplink control signal by using the first time domain resource and the second frequency domain resource according to the second indication message.
  • the first frequency domain resource is different from the second frequency domain resource.
  • channel sounding reference signal and the uplink control signal of the second terminal occupy different frequency domain resources on the same time domain resource.
  • the channel sounding reference signal occupies a set of consecutive subcarriers on the first time domain resource, and the first time domain resource includes a plurality of uplink transmission symbols.
  • the channel sounding reference signal occupies a set of discrete spaced fixed subcarriers on the first time domain resource, and the first time domain resource includes an uplink transmission symbol.
  • the first indication message is further used to indicate that the first terminal sends the sequence used by the channel sounding reference signal and at least one of an occupied physical resource block and an initial subcarrier number.
  • the second indication message is further used to indicate that the second terminal sends the sequence used by the uplink control signal and at least one of the occupied physical resource block and the initial subcarrier number.
  • the second indication message is further used to indicate a power allocation manner of the second terminal to send an uplink control signal, where the power allocation manner is used to indicate that the second terminal allocates power to uplink control information and Demodulating the reference signal; or the power allocation mode is used to instruct the second terminal to allocate power to the demodulation reference signal.
  • the method for transmitting the SRS by using the reserved frequency domain resource is adopted, so that the first terminal sends the channel sounding reference signal according to the indication message occupying the first frequency domain resource, and the channel sounding reference signal and the uplink control signal of the second terminal are occupied.
  • Different frequency domain resources on the same time domain resource thereby achieving hybrid transmission of short duration uplink control and SRS.
  • the scheme for reserving the frequency domain resource transmission SRS is further described below in conjunction with a specific example.
  • a manner in which a set of consecutive subcarriers (ie, PRBs) is reserved in the frequency domain or a set of discrete fixed-separated subcarriers is reserved in the frequency domain may be adopted. Since the subcarriers occupied by the SRS are no longer used for UCI and DMRS transmission, the SRS and the UCI or DMRS do not interfere with each other in the frequency domain.
  • FIG. 6 is a schematic diagram of reserved subcarrier transmission SRS.
  • the subcarriers of the DMRS are allocated one by one for every five subcarriers, and the subcarriers of the SRS are allocated one by five, and the remaining subcarriers are transmitted by the UCI.
  • the SRS positions in the case of two PRBs are shown.
  • the number of subcarriers occupied by the SRS can be extended according to the requirements of five intervals.
  • the subcarriers of the DMRS are allocated one by three subcarriers, the subcarriers of the SRS are allocated one by three, and the remaining subcarriers are transmitted by the UCI.
  • the SRS positions in the case of two PRBs are shown.
  • the number of subcarriers occupied by the SRS can be continuously expanded according to the requirements of three intervals.
  • the PRBs may be allocated to different UE groups respectively, and the subcarriers occupied by the SRS are not limited to the PRBs allocated to a certain UE.
  • the gNB When the gNB schedules the UE to transmit the SRS signal, it explicitly or implicitly indicates the PRB or the initial subcarrier number occupied by the UE or the adopted spreading sequence. Multiple UEs may use different spreading sequences to transmit on subcarriers occupied by the SRS, where each spreading sequence is required to be orthogonal to each other.
  • the gNB schedules the UE to transmit the uplink control signaling, and the number of subcarriers transmitted by the UE on one PRB is reduced, and the gNB can pass the RRC or DCI or the slot/frame type indication, etc., because the PRB middle molecular carrier is allocated to the SRS for transmission. Implicitly or explicitly indicating the subcarriers occupied by the UE by its UCI and DMRS.
  • the power can be equally distributed to the remaining occupied subcarriers for power boosting; or the power of the subcarrier where the DMRS is located is increased, that is, the additional power is allocated to the DMRS.
  • the two methods can be specified in the standard, and the gNB schedules the UE to transmit the uplink control signaling, and implicitly or explicitly indicates the power allocation mode adopted by the UE.
  • FIG. 7 is a schematic diagram of a reserved PRB transmission SRS.
  • the SRS is transmitted by using the reserved frequency domain PRB, and the PRB of different locations is reserved on a plurality of uplink transmission symbols to a certain UE to achieve SRS transmission of the entire frequency band.
  • the plurality of uplink transmission symbols may be from one time slot or a subframe or multiple time slots or subframes.
  • two uplink transmission symbols are respectively located in two slots or subframes before and after.
  • the PRB of the upper half of the frequency band is allocated to the UE for frequency division multiplexing transmission of DMRS and UCI
  • the PRB of the lower half frequency band is allocated to the UE for SRS transmission
  • the PRB of the upper half of the frequency band is allocated to the UE for SRS transmission
  • the PRB of the lower half frequency band is allocated to the UE for frequency division multiplexing transmission of DMRS and UCI.
  • the scheduled UE transmits the SRS signal of the entire frequency band through the two slots before and after.
  • the four uplink transmission symbols are respectively located in four slots or subframes before and after.
  • two 1/4 frequency band PRBs are allocated to multiple UEs for frequency division multiplexing transmission of DMRS and UCI, and the remaining PRBs are allocated to multiple UEs for SRS transmission;
  • the last upstream transmission in the second time slot On the number, two 1/4-band PRBs are allocated to multiple UEs for frequency division multiplexing transmission of DMRS and UCI, and PRBs of other frequency bands are allocated to multiple UEs for SRS transmission;
  • the last uplink of the third time slot On the transmission symbol, two 1/4-band PRBs are allocated to the UE for frequency division multiplexing transmission of DMRS and UCI, and PRBs of the remaining frequency bands are allocated to the UE for SRS transmission; on the last uplink transmission symbol of the fourth time slot
  • the two 1/4-band PRBs are allocated to the UE for frequency division multiplexing transmission of DMRS and UCI,
  • the frequency bands allocated to the SRS are numbered, SRS1, SRS2, respectively, and SRS1 is allocated to the UE, and the UE transmits the SRS in the frequency domain position indicated by each symbol SRS1.
  • the transmission of the four slots SRS before and after the combination is completed, and the SRS transmission of the UE in the entire frequency band is completed.
  • the PRB where the uplink control signaling is located as shown in FIG. 7 may be implicitly or explicitly indicated by the base station by means of RRC signaling or DCI, or preset a slot of a certain label corresponding to the slot 1 or time in the standard.
  • SRS can be scheduled in a whole frequency domain, and the frequency domain can be divided into several parts, and each part is separately scheduled, and each part is not necessarily adjacent.
  • PRB1 and PRB3 respectively schedule UCI and DMRS for transmitting uplink control signaling to the UE
  • PRB2 and PRB4 are respectively allocated to different UEs for transmitting SRS signals; as shown in FIG. 8(b), PRB1 and/or PRB2 are allocated.
  • the UE transmits uplink control signaling, and PRB3 and/or PRB4 allocates to the UE to transmit the SRS.
  • FIG. 9 is a signal flow diagram of still another method for transmitting a channel sounding reference signal according to an embodiment of the present invention.
  • a method for reserving SRS by using a reserved time domain resource is used. Referring to FIG. 9, the method includes:
  • Step 901 The base station sends a first indication message to the first terminal.
  • the first indication message is used to indicate that the first terminal sends a channel sounding reference signal in the first time domain resource.
  • Step 902 The base station sends a second indication message to the second terminal.
  • the second indication message is used to indicate that the second terminal sends an uplink control signal in the second time domain resource.
  • the first time domain resource is different from the second time domain resource.
  • the second time domain resource is the next subframe or time slot of the first time domain resource.
  • the base station schedules a symbol position at which the downlink transmission ends, and the first time domain resource is located before the second time domain resource in one subframe or time slot.
  • the base station schedules a symbol position of a downlink transmission end and/or a time domain position of an uplink control signal, where the first time domain resource is located after the second time domain resource in one subframe.
  • the first indication message is further used to indicate that the first terminal transmits the channel sounding reference signal on consecutive symbols, and the channel sounding reference signal occupies each of the plurality of symbols Part of the frequency band.
  • the base station separates the plurality of symbols over a length of time of the original symbol by increasing the subcarrier width.
  • step 901 and step 902 are not limited. Step 901 may be performed before step 902, or step 902 may be performed before step 901, and step 901 and step 902 may be performed simultaneously.
  • Step 903 The first terminal sends a channel sounding reference signal in the first time domain resource according to the first indication message.
  • Step 904 The second terminal sends an uplink control signal in the second time domain resource according to the second indication message.
  • the first time domain resource is different from the second time domain resource.
  • the second time domain resource is the next subframe or time slot of the first time domain resource.
  • the first indication message is further used to indicate that the first terminal transmits on consecutive symbols.
  • the channel sounding reference signal the channel sounding reference signal occupies a partial frequency band of each of the plurality of symbols.
  • the method for transmitting the SRS by using the reserved time domain resource is used, so that the first terminal sends the channel sounding reference signal in the first time domain resource, and the time domain resource of the first time domain resource and the second terminal sending the uplink control signal are different. , thereby achieving short-term uplink control and mixed transmission of SRS.
  • Embodiments of the present invention provide five ways to transmit short duration SRS.
  • FIG. 10 is a schematic diagram of a reserved time domain resource transmission SRS in the first mode.
  • the SRS occupies the last symbol of the time slot, and the short duration uplink control in the time slot is not transmitted.
  • the specific steps can be as follows:
  • Step 1 Signaling short-term uplink control to other time slot transmissions, for example, scheduling these short-time uplink control to the next time slot transmission;
  • Step 2 The signaling scheduling UE sends an SRS in the symbol
  • steps 1 and 2 have no time domain relationship.
  • FIG. 11 is a schematic diagram of a reserved time domain resource transmission SRS according to mode 2, scheduling a symbol transmission SRS before the short duration uplink control, and scheduling an end position of the downlink transmission.
  • the specific steps can be as follows:
  • Step 1 scheduling the symbol position of the end of the downlink transmission, and explicitly or implicitly indicating, by DCI or other signaling, the symbol position of the end of the downlink transmission of the UE, for example, indicating the time slot or the subframe type implicitly indicating the downlink end position;
  • Step 2 The signaling scheduling UE sends an SRS signal on one or several symbols before the physical uplink control channel (PUCCH) after the end of the downlink, and the gNB side is reserved after the downlink ends.
  • steps 1 and 2 have no time domain relationship.
  • FIG. 12 is a schematic diagram of a reserved time domain resource transmission SRS in the third mode.
  • the short-term PUCCH is scheduled in the time domain, and the last symbol of the reserved time slot or subframe is used for SRS transmission.
  • the specific steps can be as follows:
  • Step 1 scheduling the end position of the downlink transmission, or the time domain location of the short duration PUCCH, or the time domain advance indicating the short duration PUCCH, may be indicated by DCI or other signaling, such as indicating the slot/sub
  • the frame type implicitly indicates the downlink end position
  • Step 2 The signaling scheduling UE sends an SRS in the symbol
  • steps 1 and 2 have no time domain relationship.
  • Modes 4 and 5 give a method of providing a plurality of uplink symbol transmission SRSs in one slot, respectively.
  • FIG. 13 is a schematic diagram of a plurality of symbol transmission SRSs of one slot or subframe of mode 4, and two uplink symbols are allocated to the UE to transmit SRS at the end of one slot.
  • the PRB of the upper half of the frequency band is allocated to the first group of UEs for transmitting the SRS
  • the PRB of the lower half of the frequency band is allocated to the second group of UEs for transmitting the SRS.
  • the PRB of the upper half of the frequency band is allocated to the second group of UEs for transmitting the SRS
  • the UE of the lower half of the frequency band is allocated to the first group of UEs for transmitting the SRS.
  • the first group of UEs and the second group of UEs respectively transmit the SRS of the entire frequency band by the two symbols before and after.
  • the two uplink symbols may be from different time slots or subframes.
  • FIG. 14 is a schematic diagram of an SCAR with an increased subcarrier spacing transmission of mode 5, a time domain resource where a symbol at the end of a subframe or a time slot is located, and a time domain symbol with an extended subcarrier spacing, such as the time domain resource transmission.
  • the 2 or 4 subcarrier spacings are expanded to 2 or 4 times the original subcarrier spacing. Transmission in different frequency bands on different symbols SRS of each UE.
  • each 1/4 band PRB is allocated to each group of UEs to transmit SRS. As shown in the figure. Each group of UEs performs SRS transmission of the entire frequency band by transmitting SRS on 4 symbols.
  • each network element such as a terminal, a base station, etc.
  • each network element includes hardware structures and/or software modules corresponding to each function.
  • the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
  • the embodiments of the present invention may perform the division of the function modules on the terminal, the base station, and the like according to the foregoing method.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 15 shows a possible structural diagram of the terminal involved in the above embodiment.
  • the terminal 1500 includes a processing module 1502 and a communication module 1503.
  • the processing module 1502 is configured to control and manage the actions of the terminal.
  • the processing module 1502 is configured to support the terminal to perform the process 302 in FIG. 3, the process 503 in FIG. 5, the process 903 in FIG. 9, and/or Other processes of the described techniques.
  • the communication module 1503 is configured to support communication between the terminal and other network entities, such as communication with a base station.
  • the terminal may further include a storage module 1501 for storing program codes and data of the terminal.
  • the processing module 1502 may be a processor or a controller, for example, may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application specific integrated circuit (Application-Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication module 1503 may be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and may include one or more interfaces.
  • the storage module 1501 may be a memory.
  • the terminal involved in the embodiment of the present invention may be the terminal device shown in FIG.
  • the terminal 1600 includes a processor 1602, a communication interface 1603, and a memory 1601.
  • the communication interface 1603, the processor 1602, and the memory 1601 may be connected to each other through a communication connection.
  • FIG. 17 shows a possible structural diagram of the base station involved in the above embodiment.
  • the base station 1700 includes a processing module 1702 and a communication module 1703.
  • the processing module 1702 is configured to perform control management on the actions of the base station.
  • the processing module 1702 is configured to support the base station to perform the process 301 in FIG. 3, processes 501 and 502 in FIG. 5, processes 901 and 902 in FIG. 9, and/or Or other processes for the techniques described herein.
  • the communication module 1703 is configured to support communication between the base station and other network entities, such as communication with the terminal.
  • Base station can also
  • the storage module 1701 is included to store program codes and data of the base station.
  • the processing module 1702 may be a processor or a controller, and may be, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the communication module 1703 can be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name and can include one or more interfaces.
  • the storage module 1701 may be a memory.
  • the base station involved in the embodiment of the present invention may be the base station shown in FIG. 18.
  • the base station 1800 includes a processor 1802, a communication interface 1803, and a memory 1801.
  • the communication interface 1803, the processor 1802, and the memory 1801 may be connected to each other through a communication connection.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

Selon certains modes de réalisation, la présente invention concerne un procédé de transmission pour un signal de référence de sondage de canal, un terminal et une station de base. Le procédé comprend les étapes suivantes : un message d'indication provenant d'une station de base est reçu par un premier terminal ; une première séquence est utilisée pour transmettre un signal de référence de sondage de canal (SRS) sur la base du message d'indication, toutes les ressources ou certaines ressources de ressources temps-fréquence occupées par le SRS appartenant à des ressources temps-fréquence occupées par un signal de commande de liaison montante d'un second terminal. Ou, un message d'indication provenant d'une station de base est reçu par un terminal, une première ressource de domaine fréquentiel est occupée pour transmettre un SRS sur la base du message d'indication, le SRS et un signal de commande de liaison montante d'un second terminal occupant différentes ressources de domaine fréquentiel sur une même ressource de domaine fréquentiel. Ou, un premier message d'indication est transmis par une station de base à un premier terminal, le premier message d'indication étant utilisé pour indiquer au premier terminal de transmettre un SRS sur une première ressource de domaine temporel, et la première ressource de domaine temporel étant différente d'une ressource de domaine temporel sur laquelle un second terminal transmet un signal de commande de liaison montante. Les modes de réalisation de la présente invention mettent en oeuvre une commande de liaison montante de courte durée et une transmission hybride du SRS.
PCT/CN2017/078202 2017-02-04 2017-03-24 Procédé de transmission pour signal de référence de sondage de canal, terminal et station de base WO2018141126A1 (fr)

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