WO2017024999A1

WO2017024999A1 - Method and device for determining ra-rnti

Info

Publication number: WO2017024999A1
Application number: PCT/CN2016/093630
Authority: WO
Inventors: 高雪娟; 邢艳萍
Original assignee: 电信科学技术研究院
Priority date: 2015-08-11
Filing date: 2016-08-05
Publication date: 2017-02-16
Also published as: CN106455112B; CN106455112A

Abstract

Disclosed are a method and device for determining an RA-RNTI, used for solving the problem in the prior art of the RA-RNTI relating only to a PRACH time-frequency domain resource, causing the RA-RNTIs of different coverage enhancement levels to be the same and the Msg2s that correspond to terminals of different coverage enhancement levels to be impossible to distinguish. The method comprises: according to a correlation between the coverage enhancement level and/or number of repeated transmissions and the RA-RNTI offset value, determining the RA-RNTI offset value corresponding to the coverage enhancement level and/or number of repeated transmissions of the terminal; according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal, determining the RA-RNTI of the terminal; thus it is ensured that the Msg2 scheduling information of the terminals having different coverage enhancement levels may be independently transmitted according to the number of repeated transmissions of each terminal.

Description

Method and device for determining RA-RNTI

The present application claims priority to Chinese Patent Application No. 201510491481.5, filed on Aug. 11, 2015, the entire disclosure of which is incorporated herein by reference. In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a device for determining a RA-RNTI (Random Access Radio Network Temporary Identifier) in a coverage enhancement scenario.

Background technique

The contention of the random access means that the eNB (eNodeB, the evolved base station) does not allocate dedicated resources for the UE (User Equipment terminal, also called user equipment), and is randomly initiated by the terminal. The competitive random access is applicable to all five scenarios. For the RRC (Radio Resource Control) connection establishment, the RRC connection reestablishment, and the uplink data arrival scenario, the random access is completely self-transmitted by the terminal, and the eNB does not have any priori. Information; for handover and downlink data arrival scenarios, the terminal initiates random access according to the indication of the eNB. Generally speaking, the eNB preferentially selects non-contention random access, and only indicates when the non-contention random access resource is insufficiently allocated. The terminal initiates a contention random access. The competitive random access process is completed in four steps. As shown in Figure 1, each step is called a Message. In the relevant standard, these four steps are called Msg1~Msg4. among them:

Msg1: preamble sequence.

The message is an uplink message, which is sent by the terminal, and is received by the eNB, and is carried in a PRACH (Physical Random Access Channel). For the contention random access, the preamble sequence sent by the terminal is randomly selected in a specific preamble set, and the different preamble sequences have different identification information, that is, a preamble index.

Msg2: RAR (Random Access Response).

The message is a downlink message, which is sent by the eNB and received by the terminal.

Msg2 is the response of the eNB to the random access initiated by the terminal after receiving the Msg1, and must be sent in the random access response window. The start of the random access response window is the first available downlink subframe that satisfies n+3, and n is the last subframe transmitted by the preamble sequence, and the length is 2 to 10 ms, which is specified by the eNB in the system message.

The Msg2 is a DL-SCH (Downlink Shared Channel) defined by a MAC (Media Access Control) layer, and corresponds to a PDSCH (Physical Downlink Shared Channel) at the physical layer. An Msg2 can respond to random access requests from multiple terminals, that is, simultaneously Hungry RAR carrying multiple terminals, so Msg2 does not have a HARQ (Hybrid Automatic Repeat reQuest) process, that is, there is no feedback retransmission process.

The eNB schedules Msg2, RA-RNTI with a PDCCH (Physical Downlink Control Channel) scrambled by a RA-RNTI (Random Access Radio Network Temporary Identifier) transmitted in a common search space. It is determined by the location of the PRACH time-frequency resource that sends the Msg1; the terminal that uses the same PRACH time-frequency resource calculates the same RA-RNTI, and the RAR information is packetized and sent in the same RAR message, and the RAR message is carried by the RA-RNTI. The interfered PDCCH is scheduled to be transmitted in the downlink shared channel, and the downlink shared channel is also scrambled using the RA-RNTI.

The content in Msg2 includes: backoff parameter, identification information of the preamble sequence corresponding to Msg1, uplink transmission TA (timing advance), and UL grant of Msg3 (uplink scheduling permission, also called RAR grant at the physical layer) Temporary C-RNTI (Cell-Radio Network Temporary Identifier), referred to as TC-RNTI. The backoff parameter is used to indicate the average delay of the next time the terminal initiates random access if the random access fails.

The terminal identifies the RAR message carrying the RAR (ie, Msg2 sent in the DL-SCH) by using the RA-RNTI determined by the PRACH time-frequency domain resource used by the preamble sequence in Msg1, and the MSR3 is transmitted in the RAR message according to itself. The identification information of the preamble sequence transmitted in the middle determines the RAR sent to itself. If the terminal does not receive the RAR correctly, the delay of the next random access is determined according to the delay limit of the backoff parameter, and the random access resource is selected to initiate the next random access. After the maximum number of random accesses is reached, the MAC layer of the terminal reports the random access problem to the RRC layer, and triggers the RLF (Radio Link Failure) process.

Msg3: The uplink transmission is scheduled for the first time. After receiving the Msg2, the terminal performs uplink transmission on the uplink resource indicated by the UL grant (ie, the RAR grant) included in the obtained RAR, that is, the PUSCH (Physical Uplink) is transmitted according to the scheduling information in the RAR grant of the terminal. Shared Channel, physical uplink shared channel), the PUSCH corresponds to the UL-SCH (Uplink Shared Channel) of the MAC layer.

Msg4: Competitive solution. The eNB and the terminal complete the final contention resolution through Msg4. The content of Msg4 corresponds to the content of Msg3.

With the rise of the Internet of Things, support for MTC (Machine Type Communication) in LTE (Long Term Evolution) systems has received increasing attention. A physical layer enhancement project for MTC was established in 3GPP Release 13. An MTC device (also known as an MTC terminal) may have some of the M2M (Machine to Machine) communication characteristics, such as low mobility, small amount of transmitted data, and insensitivity to communication delays. Very low power consumption, etc.

In the existing network, operators find terminals working in certain scenarios, such as working in a basement, shopping mall, or building. In the corner terminal, because the wireless signal is severely blocked, the signal is greatly attenuated and cannot communicate with the network. The deep coverage of the network for these scenarios will greatly increase the network construction cost. After testing, it is considered that there is a need to enhance the existing coverage to a certain extent. To achieve coverage enhancement, a more feasible method is to use repeated transmission or similar techniques for existing channels. In theory, a certain degree of coverage gain can be obtained by performing tens to hundreds of repeated transmissions on existing physical channels.

In the case of coverage enhancement transmission, in order to improve transmission performance, a PRACH (Physical Random Access Channel) needs to be repeatedly transmitted. Different coverage enhancement levels are defined for different coverage enhancement targets. Different coverage enhancement levels correspond to different repetition transmission times. Therefore, the base station needs to know the coverage enhancement level of the terminal explicitly, and can receive and merge the preamble sequence according to the repeated transmission times corresponding to the coverage enhancement level of the terminal. Therefore, different coverage enhancement levels need to be distinguished from the three aspects of PRACH time domain resources, frequency domain resources, and preamble sequences. For example, there are four coverage enhancement levels in the system, namely level0, level1, level2, and level3, where level0 indicates that coverage enhancement is not required, and the first method can use TDM (Time Division Multiplexing). That is, the level 0, level 1, level 2, level 3 are configured with different subframes for transmitting PRACH; the second method can be FDM (Frequency Division Multiplexing), that is, level 0, 1, 2 3, different frequency domain resources (PRBs (Physical Resource Blocks) with different locations) can be used to transmit PRACH; the third mode can be CDM (Code Division Multiplexing), that is, level0 1, 2, 3 are configured with different preamble sequence candidate sets. Of course, the above three methods can also be combined.

In Msg2, the number of repeated transmissions of the downlink control channel carrying the Msg2 that is scrambled by the RA-RNTI corresponding to different levels is different, and the number of repeated transmissions of the Msg2 carried by the downlink control channel scrambled by the RA-RNTI is also different. Different, therefore, it is necessary to distinguish scheduling information of different levels. However, according to the prior art, when the PRACHs of different levels are used, the frequency domain resources are the same (for example, only the CDM is used to distinguish different levels), since the RA-RNTI is only related to the PRACH time-frequency domain resources used by the terminal, different levels correspond to The RA-RNTI is the same, and it is impossible to distinguish the Msg2 corresponding to the terminal of different levels.

Summary of the invention

An embodiment of the present application provides a method and a device for determining an RA-RNTI, which are used to solve the RA-RNTI corresponding to different coverage enhancement levels in the prior art because the RA-RNTI is only related to the PRACH time-frequency domain resources used by the terminal. Similarly, the problem of Msg2 corresponding to terminals with different coverage enhancement levels cannot be distinguished.

A method for determining an RA-RNTI provided by the present application, the method comprising:

Determining the terminal according to the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value Covering the RA-RNTI offset value corresponding to the enhancement level and/or the number of repeated transmissions;

Determining the RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the physical random access channel PRACH time-frequency resource used by the terminal.

Optionally, the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is predefined; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is notified by the system information.

Optionally, the system information carries information indicating a correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value;

The information indicating the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is: an RA-RNTI offset value corresponding to each coverage enhancement level and/or the number of repeated transmissions, Or index information of each RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.

Optionally, the system information further includes information used to indicate whether the system information includes a correspondence relationship between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value.

Optionally, determining, according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal, and the PRACH time-frequency resource used by the terminal, determining the RA-RNTI of the terminal according to the following formula: :

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

Where t_id is the number of the first subframe corresponding to the PRACH time-frequency resource used by the terminal, 0≤t_id<10; f_id is the number of the PRACH time-frequency resource used by the terminal in one subframe, 0≤f_id <6, RNTI_offset is an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.

Based on any of the foregoing embodiments, the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value include N coverage enhancement states, where the N coverage enhancement states include one for indicating no Need to cover the enhanced state, and N-1 need to enhance the different coverage enhancement states greater than 0dB, N is a positive integer; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value includes N-1 different coverage enhancement states requiring enhancement greater than 0 dB, and N is a positive integer.

A device for determining an RA-RNTI provided by the embodiment of the present application, the device includes:

a first processing module, configured to determine, according to a coverage enhancement level and/or a correspondence between the number of repeated transmissions and the RA-RNTI offset value, an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal;

The second processing module is configured to determine the RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal.

Optionally, the second processing module determines the RA-RNTI of the terminal according to the following formula:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

Based on any of the above embodiments, the device is a terminal and/or a base station.

A terminal provided by an embodiment of the present application includes: a processor, configured to read a program in a memory, and perform the following process:

Determining, according to a correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value, an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal; and enhancing the coverage according to the terminal The RA-RNTI offset value corresponding to the level and/or the number of repeated transmissions and the PRACH time-frequency resource used by the terminal determine the RA-RNTI of the terminal.

Based on any of the above embodiments, the processor determines the RA-RNTI of the terminal according to the following formula:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

In the embodiment of the present application, the RA-RNTI corresponding to the terminal with different coverage enhancement levels and/or repeated transmission times is distinguished by introducing different coverage enhancement levels and/or RA-RNTI offset values corresponding to the number of repeated transmissions to ensure that the RA-RNTI corresponding to the terminal with different coverage enhancement levels and/or repeated transmission times is used to ensure The Msg2 scheduling information of terminals having different coverage enhancement levels and/or repeated transmission times may be independently transmitted according to the respective repeated transmission times.

DRAWINGS

1 is a schematic diagram of a competitive random access procedure;

2 is a schematic flowchart of a method for determining an RA-RNTI according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a determining apparatus of an RA-RNTI according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a terminal according to an embodiment of the present application.

detailed description

The embodiments of the present application are further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described herein are merely illustrative and are not intended to be limiting.

A method for determining an RA-RNTI provided by the embodiment of the present application is as shown in FIG. 2, and the method includes the following process:

S21. The RA-RNTI offset value corresponding to the coverage enhancement level of the terminal and/or the number of repeated transmissions is determined according to the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value.

S22. Determine an RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal.

The execution body of S21 to S22 in the embodiment of the present application may be a terminal, or may be a network device, such as a base station.

In S21, in the random access process (including Msg1, Msg2, Msg 3, and Msg 4), different coverage enhancement levels correspond to different repeated transmission times, and in the same system, one coverage enhancement level corresponds to a unique repetition. Number of transmissions (the number of repeated transmissions may be different for different physical channels in the random access procedure), so the coverage enhancement level and the number of repeated transmissions are equivalent in distinguishing the coverage of the terminal in the current system; the network side may notify the terminal Covering the enhancement level, the terminal determines the number of repeated transmissions of different physical channels according to the correspondence between the coverage enhancement level and the number of repeated transmissions, and the network side can directly notify the terminal of the repeated transmission times of different physical channels, and the terminal implicitly can be based on Corresponding relationship between the number of repeated transmissions and the coverage enhancement level, and knowing the coverage enhancement level corresponding to itself (of course, the terminal may not need to further determine the coverage enhancement level, because the terminal needs to know the repeated transmission times when transmitting the physical channel); Level and RA-RNTI offset value Relationship should be determined to cover the terminal reinforcing RA-RNTI corresponding to the offset value level may be determined RA-RNTI offset value corresponding to the number of repetitions of transmission terminals simultaneously.

In the implementation, in the S22, according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal, the RA-RNTI of the terminal is determined according to Equation 1:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset...Formula 1;

Where t_id is the number of the first subframe corresponding to the PRACH time-frequency resource used by the terminal, 0≤t_id<10; f_id is the number of the PRACH time-frequency resource used by the terminal in one subframe, and 0≤f_id<6 RNTI_offset is an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.

In the implementation, the coverage enhancement level and/or the number of repeated transmissions are included in the correspondence relationship with the RA-RNTI offset value. The coverage enhancement state includes the following two implementations:

The mode A, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value include N coverage enhancement states, where the N coverage enhancement states include a state indicating that coverage enhancement is not required. And N-1 need to enhance different coverage enhancement states greater than 0 dB, N is a positive integer.

In this manner, the corresponding RA-RNTI offset value is also introduced for the case where the coverage enhancement is not required, so that all terminals need to determine the RA-RNTI of the terminal by using the RA-RNTI offset value corresponding to the terminal.

In this manner, the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value further includes the following two alternative implementation manners:

The correspondence between the mode A1, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value is predefined.

For example, the correspondence between the predefined coverage enhancement level and the RA-RNTI offset value may be a list as shown in Table 1-1.

Table 1-1

覆盖增强等级Coverage enhancement level	RA-RNTI偏移值RA-RNTI offset value
覆盖增强等级0(level0)Coverage enhancement level 0 (level0)	a0A0
覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	a1A1
覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	a2A2
覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	a3A3
……......	……......

Alternatively, the correspondence between the number of repeated transmissions of a predetermined physical channel and the RA-RNTI offset value may be a list as shown in Table 1-2.

Table 1-2

物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
重复传输次数T0(level0)Repeated transmission times T0 (level0)	a0A0
重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2

重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3
……......	……......

Alternatively, the pre-defined coverage enhancement level and the correspondence between the number of repeated transmissions of one physical channel and the RA-RNTI offset value may be a list as shown in Table 1-3.

Table 1-3

覆盖增强等级Coverage enhancement level	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
覆盖增强等级0(level0)Coverage enhancement level 0 (level0)	重复传输次数T0(level0)Repeated transmission times T0 (level0)	a0A0
覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3
……......	……......	……......

Where level0 indicates that the coverage enhancement is not required, that is, 0dB coverage enhancement, corresponding to T0=0, that is, no repeated transmission is needed, and other levels respectively indicate coverage enhancement of different levels, specifically, level1 corresponds to b1dB coverage enhancement, level2 corresponds b2dB coverage enhancement, level3 corresponds to b3dB coverage enhancement. When a0, a1, a2, and a3 are different from each other, the RA-RNTI of the terminal having different coverage enhancement conditions (including the case where coverage enhancement is not required) is different, and the physical channel 1 may be PRACH in Msg1, and enhanced in Msg2. At least one of a physical downlink control channel (EPDCCH), a PDSCH, a PUSCH in Msg3, and an EPDCCH and a PDSCH in Msg4.

Assuming that the CDM method is used to distinguish the different coverage enhancement levels, the terminal 1 belongs to level 0, the preamble 1 (the number of the preamble sequence) is used, the terminal 2 belongs to the level 1 and the preamble 2 is used, the terminal 3 belongs to the level 2, and the preamble 3 is used; the terminal 4 belongs to the level 3, and the preamble 4 is used. Terminal 1, terminal 2, terminal 3, and terminal 4 all repeatedly transmit their preamble sequences on the same PRACH time-frequency resource according to the number of repeated transmissions, assuming that the first subframe of the PRACH is subframe 2 in one radio frame, that is, T_id=2, the PRACH frequency domain resource number in one subframe is 0, that is, f_id=0. Then, based on Table 1, the RA-RNTIs of the terminal 1 to the terminal 4 determined by using the above formula 1 are:

RA-RNTI-1=1+2+0*10+a0=3+a0 of terminal 1;

Terminal 2 RA-RNTI-2=1+2+0*10+a1=3+a1;

Terminal 3 RA-RNTI-3=1+2+0*10+a2=3+a2;

The RA-RNTI-4 of the terminal 4 = 1 + 2 + 0 * 10 + a3 = 3 + a3.

The correspondence between the mode A2, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value is notified by system information, such as by a System Information Block (SIB).

The information used to indicate the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value may be any of the following information:

1. The RA-RNTI offset value corresponding to each coverage enhancement level and/or number of repeated transmissions.

Specifically, for each coverage enhancement level definition

The bit information directly indicates the RA-RNTI offset value corresponding to each coverage enhancement level, where A is the maximum number of bits of the RA-RNTI offset value.

2. Index information of each RA-RNTI offset value corresponding to the enhancement level and/or the number of repeated transmissions.

Specifically, each coverage enhancement level and/or number of repeated transmissions is defined

Bit information,

The different states of the bit information indicate RA-RNTI offset values of different coverage enhancement levels and/or repetition transmission times, where B represents the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value are included in the correspondence relationship Covering the number of enhanced states, assuming that the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value include four coverage enhancement states, then define

Bit information.

For example, the index information of the RA-RNTI offset value corresponding to each coverage enhancement level in the correspondence between the coverage enhancement level and the RA-RNTI offset value is as shown in Table 2-1.

table 2-1

B比特信息B bit information	覆盖增强等级Coverage enhancement level	RA-RNTI偏移值RA-RNTI offset value
0000	覆盖增强等级0(level0)Coverage enhancement level 0 (level0)	a0A0
0101	覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	a1A1
1010	覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	a2A2
1111	覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	a3A3

Or, the index information of the RA-RNTI offset value corresponding to each repeated transmission number in the correspondence between the number of repeated transmissions of the physical channel and the RA-RNTI offset value is as shown in Table 2-2.

Table 2-2

B比特信息B bit information	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
0000	重复传输次数T0(level0)Repeated transmission times T0 (level0)	a0A0

0101	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
1010	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
1111	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Or, the index information of the coverage enhancement level and the RA-RNTI offset value corresponding to each coverage enhancement level and the number of repeated transmissions in the correspondence between the number of repeated transmissions of one physical channel and the RA-RNTI offset value is as follows: 3 is shown.

Table 2-3

B比特信息B bit information	覆盖增强等级Coverage enhancement level	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
0000	覆盖增强等级0(level0)Coverage enhancement level 0 (level0)	重复传输次数T0(level0)Repeated transmission times T0 (level0)	a0A0
0101	覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
1010	覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
1111	覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Where 00 represents level0 (the case where coverage enhancement is not required, that is, 0dB coverage enhancement, corresponding to T0=0, that is, no repeated transmission is required), the RA-RNTI offset value is a0; 01 represents level1 (corresponding to b1dB coverage enhancement), The RA-RNTI offset value is a1; 10 indicates level 2 (corresponding to b2dB coverage enhancement), RA-RNTI offset value is a2; 11 indicates level 3 (corresponding to b3dB coverage enhancement), and RA-RNTI offset value is a3. When a0, a1, a2, and a3 are different from each other, the RA-RNTI of the terminal having different coverage enhancement conditions (including the case where coverage enhancement is not required) is different, and the physical channel 1 may be PRACH in Msg1, EPDCCH in Msg2, PDSCH, PUSCH in Msg3, at least one of EPDCCH and PDSCH in Msg4.

In the above process, there may also be 1-bit information in the system information indicating whether B-bit information exists. For example, “1” indicates that there is B-bit information, the terminal needs to read B-bit information, and the RA-RNTI offset value is determined according to different states of the B-bit information; “0” indicates that there is no B-bit information, and the terminal does not need to parse the B-bit information. The RA-RNTI offset value is not configured at this time, and the terminal can calculate the RA-RNTI in a conventional manner.

The correspondence between the mode B, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value includes N-1 different coverage enhancement states that need to be enhanced by more than 0 dB, and N is a positive integer.

In this mode, the RA-RNTI offset value is not introduced for the case where the coverage enhancement is not required, and the RA-RNTI offset value is introduced when the coverage enhancement is required, so that the terminal that does not need the coverage enhancement can determine its own RA by using an existing algorithm. - RNTI, the coverage enhanced terminal needs to determine its own RA-RNTI using the RA-RNTI offset value.

Of course, this method can also introduce the RA-RNTI offset value for the case where the coverage enhancement is not needed, and the coverage needs to be increased. The coverage enhancement level of the strong case does not introduce the RA-RNTI offset value. The specific process is similar and will not be described here.

The correspondence between the mode B1, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value is predefined.

For example, the correspondence between the predefined coverage enhancement level and the RA-RNTI offset value may be a list as shown in Table 3-1.

Table 3-1

覆盖增强等级Coverage enhancement level	RA-RNTI偏移值RA-RNTI offset value
覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	a1A1
覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	a2A2
覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	a3A3

Alternatively, the correspondence between the number of repeated transmissions of a predetermined physical channel and the RA-RNTI offset value may be a list as shown in Table 3-2.

Table 3-2

物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Alternatively, the pre-defined coverage enhancement level and the correspondence between the number of repeated transmissions of one physical channel and the RA-RNTI offset value may be a list as shown in Table 3-3.

Table 3-3

覆盖增强等级Coverage enhancement level	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1

覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Among them, level1 corresponds to b1dB coverage enhancement, level2 corresponds to b2dB coverage enhancement, and level3 corresponds to b3dB coverage enhancement. When a1, a2, and a3 are different from each other, the RA-RNTI of the terminal with different coverage enhancement conditions is different, and the physical channel 1 may be Msg1. The PRACH in the middle, the EPDCCH in the Msg2, the PDSCH, the PUSCH in the Msg3, and the EPDCCH and the PDSCH in the Msg4. Assume that the terminal 1 is a terminal that does not need coverage enhancement, and does not introduce an RA-RNTI offset value, and uses preamble1 (a number of preamble sequences); terminal 2 belongs to level 1 and uses preamble 2; terminal 3 Belongs to level2, using preamble3; terminal 4 belongs to level3, using preamble4. Terminal 1, terminal 2, terminal 3, and terminal 4 all repeatedly transmit their preamble sequences on the same PRACH time-frequency resource according to the number of repeated transmissions, assuming that the first subframe of the PRACH is subframe 2 in one radio frame, that is, T_id=2, the PRACH frequency domain resource number in one subframe is 0, that is, f_id=0. then:

Determining the RA-RNTI of the terminal 1 based on the PRACH time-frequency resource only, obtaining RA-RNTI-1=1+2+0*10=3;

Based on Table 3, the RA-RNTIs of Terminals 2 to 4 determined by the above Equation 1 are:

Terminal 2 RA-RNTI-2=1+2+0*10+a1=3+a1;

Terminal 3 RA-RNTI-3=1+2+0*10+a2=3+a2;

The RA-RNTI-4 of the terminal 4 = 1 + 2 + 0 * 10 + a3 = 3 + a3.

The correspondence between the mode B2, the coverage enhancement level, and/or the number of repeated transmissions and the RA-RNTI offset value is notified by the system information, for example, the SIB notifies the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value. Correspondence relationship.

The bit information directly indicates the RA-RNTI offset value corresponding to each coverage enhancement level and/or the number of repeated transmissions, where A is the maximum number of bits of the RA-RNTI offset value.

Bit information,

The different states of the bit information indicate RA-RNTI offset values of different coverage enhancement states, where B represents the number of coverage enhancement states included in the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value, It is assumed that the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value include three coverage enhancement levels and/or repeated transmission times, then

Bit information.

For example, the index information of the RA-RNTI offset value corresponding to each coverage enhancement level in the correspondence between the coverage enhancement level and the RA-RNTI offset value is as shown in Table 4-1.

Table 4-1

B比特信息B bit information	覆盖增强等级Coverage enhancement level	RA-RNTI偏移值RA-RNTI offset value
0101	覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	a1A1
1010	覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	a2A2
1111	覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	a3A3

Or, the index information of the RA-RNTI offset value corresponding to each repeated transmission number in the correspondence between the number of repeated transmissions of the physical channel and the RA-RNTI offset value is as shown in Table 4-2.

Table 4-2

B比特信息B bit information	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
0101	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
1010	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
1111	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Or, the index information of the coverage enhancement level and the RA-RNTI offset value corresponding to each coverage enhancement level and the number of repeated transmissions in the correspondence between the number of repeated transmissions of the physical channel and the RA-RNTI offset value is as shown in Table 4- 3 is shown.

Table 4-3

B比特信息B bit information	覆盖增强等级Coverage enhancement level	物理信道1的重复传输次数Repeated transmission times of physical channel 1	RA-RNTI偏移值RA-RNTI offset value
0101	覆盖增强等级1(level1)Coverage enhancement level 1 (level1)	重复传输次数T 1(level1)Repeated transmission times T 1 (level1)	a1A1
1010	覆盖增强等级2(level2)Coverage enhancement level 2 (level2)	重复传输次数T 2(level2)Repeated transmission times T 2 (level2)	a2A2
1111	覆盖增强等级3(level3)Coverage enhancement level 3 (level3)	重复传输次数T 3(level3)Repeated transmission times T 3 (level3)	a3A3

Where 00 represents level1 (corresponding to b1dB coverage enhancement), RA-RNTI offset value is a1; 01 represents level2 (corresponding to b2dB coverage enhancement), the RA-RNTI offset value is a2; 10 indicates level3 (corresponding to b3dB coverage enhancement), and the RA-RNTI offset value is a3. When a1, a2, and a3 are different from each other, the RA-RNTI of the terminal having different coverage enhancement conditions is different. The physical channel 1 may be a PRACH in the Msg1, an EPDCCH in the Msg2, a PUSCH in the Msg3, and an EPDCCH in the Msg4. At least one of PDSCH.

In the above table, the "00" state of the B-bit information may also be used to indicate that the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI are not configured, or other 1-bit information in the system information is used to indicate whether B is present. Bit information, for example, "1" indicates that B bit information exists, the terminal needs to read B bit information, and the RA-RNTI offset value is determined according to different states of the B bit information, and "0" indicates that there is no B bit information, and the terminal does not need The B-bit information is parsed. At this time, the RA-RNTI offset value is not configured, and the terminal can calculate the RA-RNTI in a conventional manner.

The above method processing flow can be implemented by a software program, which can be stored in a storage medium, and when the stored software program is called, the above method steps are performed.

Based on the same inventive concept, an apparatus for determining an RA-RNTI is also provided in the embodiment of the present application. Since the principle of solving the problem is similar to the method for determining the RA-RNTI, the implementation of the device may refer to the method. Implementation, repetition will not be repeated.

A determining device for the RA-RNTI provided by the embodiment of the present application is as shown in FIG. 3, and the device includes:

The first processing module 31 is configured to determine, according to the coverage enhancement level and/or the correspondence between the number of repeated transmissions and the RA-RNTI offset value, the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal. ;

The second processing module 32 is configured to determine the RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal. .

In this embodiment of the present application, the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is predefined; or

Based on any of the above embodiments, the second processing module 32 determines the terminal according to the following formula. RA-RNTI:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

The following is a description of the structure and processing manner of the device provided by the embodiment of the present application.

As shown in FIG. 4, the terminal includes a processor 401 for reading a program in the memory 402, and performing the following process:

In FIG. 4, a bus architecture (represented by bus 400), bus 400 may include any number of interconnected buses and bridges, and bus 400 will include one or more processors and memory 402 represented by general purpose processor 401. The various circuits of the memory are linked together. The bus 400 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. Bus interface 403 provides an interface.

The processor 401 is responsible for managing the bus 400 and the usual processing, running a general purpose operating system as described above. The memory 402 can be used to store data used by the processor 401 in performing operations.

Optionally, the processor 401 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD. (Complex Programmable Logic Device).

In the embodiment of the present application, the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is Pre-defined; or

Based on any of the above embodiments, the processor 401 determines the RA-RNTI of the terminal according to the following formula:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A method for determining a random access radio network temporary identifier RA-RNTI, the method comprising:

Determining, according to a correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value, an RA-RNTI offset value corresponding to the coverage enhancement level of the terminal and/or the number of repeated transmissions;

Determining the RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the physical random access channel PRACH time-frequency resource used by the terminal.
The method of claim 1 wherein

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is predefined; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is notified by the system information.
The method according to claim 2, wherein the system information carries information indicating a correspondence between a coverage enhancement level and/or a repetition transmission number and an RA-RNTI offset value;

The information indicating the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is: an RA-RNTI offset value corresponding to each coverage enhancement level and/or the number of repeated transmissions, Or index information of each RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The method according to claim 3, wherein the system information further comprises: indicating, in the system information, whether the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value are included in the system information. Correspondence information.
The method according to claim 1, wherein the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal are according to the following formula: Determine the RA-RNTI of the terminal:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

Where t_id is the number of the first subframe corresponding to the PRACH time-frequency resource used by the terminal, 0≤t_id<10; f_id is the number of the PRACH time-frequency resource used by the terminal in one subframe, 0≤f_id <6, RNTI_offset is an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The method according to any one of claims 1 to 5, wherein the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value comprise N coverage enhancement states, wherein the N The coverage enhancement state includes a state for indicating that coverage enhancement is not required, and N-1 different coverage enhancement states requiring enhancement greater than 0 dB, where N is a positive integer; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value includes N-1 different coverage enhancement states requiring enhancement greater than 0 dB, and N is a positive integer.
A determining device for an RA-RNTI, the device comprising:

a first processing module, configured to determine, according to a coverage enhancement level and/or a correspondence between the number of repeated transmissions and the RA-RNTI offset value, an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal;

The second processing module is configured to determine the RA-RNTI of the terminal according to the RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal and the PRACH time-frequency resource used by the terminal.
The device of claim 7 wherein:

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is predefined; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is notified by the system information.
The device according to claim 8, wherein the system information carries information indicating a correspondence between a coverage enhancement level and/or a repetition transmission number and an RA-RNTI offset value;

The information indicating the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is: an RA-RNTI offset value corresponding to each coverage enhancement level and/or the number of repeated transmissions, Or index information of each RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The device according to claim 9, wherein the system information further comprises: indicating, in the system information, whether the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value are included. Correspondence information.
The device according to claim 7, wherein the second processing module determines the RA-RNTI of the terminal according to the following formula:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

Where t_id is the number of the first subframe corresponding to the PRACH time-frequency resource used by the terminal, 0≤t_id<10; f_id is the number of the PRACH time-frequency resource used by the terminal in one subframe, 0≤f_id <6, RNTI_offset is an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The device according to any one of claims 7 to 11, wherein the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value comprise N coverage enhancement states, wherein the N The coverage enhancement state includes a state for indicating that coverage enhancement is not required, and N-1 different coverage enhancement states requiring enhancement greater than 0 dB, where N is a positive integer; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value includes N-1 needs to be increased. Stronger than 0dB for different coverage enhancement states, N is a positive integer.
The device according to any one of claims 7 to 11, characterized in that the device is a terminal and/or a base station.
A determining device of an RA-RNTI, characterized in that the device comprises: a processor and a memory

A processor for reading a program in the memory, performing the following process:

Determining, according to a correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value, an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions of the terminal; and enhancing the coverage according to the terminal The RA-RNTI offset value corresponding to the level and/or the number of repeated transmissions and the PRACH time-frequency resource used by the terminal determine the RA-RNTI of the terminal.
The device of claim 14 wherein:

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is predefined; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is notified by the system information.
The device according to claim 15, wherein the system information carries information indicating a correspondence between a coverage enhancement level and/or a repetition transmission number and an RA-RNTI offset value;

The information indicating the correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value is: an RA-RNTI offset value corresponding to each coverage enhancement level and/or the number of repeated transmissions, Or index information of each RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The device according to claim 16, wherein the system information further comprises: indicating, in the system information, whether the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value are included. Correspondence information.
The device according to claim 14, wherein said processor determines an RA-RNTI of said terminal according to the following formula:

RA-RNTI=1+t_id+10*f_id+RA-RNTI_offset;

Where t_id is the number of the first subframe corresponding to the PRACH time-frequency resource used by the terminal, 0≤t_id<10; f_id is the number of the PRACH time-frequency resource used by the terminal in one subframe, 0≤f_id <6, RNTI_offset is an RA-RNTI offset value corresponding to the coverage enhancement level and/or the number of repeated transmissions.
The device according to any one of claims 14 to 18, wherein the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value include N coverage enhancement states, wherein the N The coverage enhancement state includes a state for indicating that coverage enhancement is not required, and N-1 different coverage enhancement states requiring enhancement greater than 0 dB, where N is a positive integer; or

The correspondence between the coverage enhancement level and/or the number of repeated transmissions and the RA-RNTI offset value includes N-1 different coverage enhancement states requiring enhancement greater than 0 dB, and N is a positive integer.
The device according to any of claims 14 to 18, characterized in that the device is a terminal and/or a base station.