Information transmission method, apparatus, and device applied to 2-step random access procedure

1. An information transmission method, comprising:

sending a message A (MsgA) of a 2-step random access procedure to a network device according to a mapping relationship between a preamble parameter and a physical uplink shared channel (PUSCH) parameter in the MsgA;

wherein the preamble parameter comprises a preamble index and a physical random access channel (PRACH) time-frequency resource, and the PUSCH parameter comprises a PUSCH time-frequency resource and a PUSCH demodulation reference signal (DMRS);

wherein the mapping relationship comprises:

a first mapping relationship of the preamble index to the PUSCH time-frequency resource and the PUSCH DMRS, wherein the mapping relationship comprises the first mapping relationship, and the first mapping relationship comprises: M preamble indexes are mapped to one PUSCH DMRS on one PUSCH time-frequency resource, M is a positive integer greater than 1;

a second mapping relationship of the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS; and

a third mapping relationship of a combination of the preamble index and the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS.

2. The information transmission method according to claim 1 , wherein the mapping relationship comprises the third mapping relationship; and

in a case that one synchronization signal block (SSB) is mapped to 1/Y random access channel (RACH) occasions (ROs), the third mapping relationship comprises:

the 1/Y ROs are mapped to one PUSCH time-frequency resource and one PUSCH DMRS; or,

one RO is mapped to one PUSCH time-frequency resource and one PUSCH DMRS; or,

Q preamble indexes in one RO are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

or, in a case that one SSB is mapped to one RO, the third mapping relationship comprises:

H preamble indexes in one RO are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

or, in a case that W SSBs are mapped to one RO, the third mapping relationship comprises:

R consecutive contention based random access (CBRA) preamble indexes are associated with one SSB, and are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

wherein, Y is a positive number less than 1; Q, H are a positive integer greater than or equal to 1; W, R are a positive integer greater than 1.

3. The information transmission method according to claim 1 , wherein, prior to the sending the MsgA of the 2-step random access procedure to the network device according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA, the method further comprises:

receiving broadcast signaling or radio resource control (RRC) signaling sent by the network device;

obtaining the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA according to the broadcast signaling or the RRC signaling.

4. The information transmission method according to claim 1 , wherein the sending the MsgA of the 2-step random access procedure to the network device according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA comprises:

determining, according to the mapping relationship, a target PUSCH time-frequency resource and a target PUSCH DMRS for sending the MsgA; and

sending the MsgA to the network device based on the target PUSCH time-frequency resource and the target PUSCH DMRS.

5. The information transmission method according to claim 4 , wherein the determining, according to the mapping relationship, the target PUSCH time-frequency resource and the target PUSCH DMRS for sending the MsgA comprises:

obtaining a configuration resource set comprising the PRACH time-frequency resource and the preamble index;

selecting one target PRACH time-frequency resource and one target preamble index from the configuration resource set; and

determining, according to the mapping relationship, the target PUSCH time-frequency resource and the target PUSCH DMRS corresponding to the one target PRACH time-frequency resource and/or the one target preamble index;

the sending the MsgA to the network device based on the target PUSCH time-frequency resource and the target PUSCH DMRS comprises:

sending the MsgA to the network device based on the one target PRACH time-frequency resource, the one target preamble index, the target PUSCH time-frequency resource and the target PUSCH DMRS.

6. The information transmission method according to claim 1 , wherein, subsequent to the sending the MsgA of the 2-step random access procedure to the network device according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA, the method further comprises:

receiving a random access response message sent by the network device.

7. A non-transitory computer readable storage medium storing thereon a computer program, wherein the computer program is configured to be executed by a processor, to implement the steps of the information transmission method according to claim 1 .

8. An information transmission method, comprising:

receiving a message A (MsgA) of a 2-step random access procedure sent by a terminal according to a mapping relationship between a preamble parameter and a physical uplink shared channel (PUSCH) parameter in the MsgA;

wherein the preamble parameter comprises a preamble index and a physical random access channel (PRACH) time-frequency resource, and the PUSCH parameter comprises a PUSCH time-frequency resource and a PUSCH demodulation reference signal (DMRS);

wherein the mapping relationship comprises:

a first mapping relationship of the preamble index to the PUSCH time-frequency resource and the PUSCH DMRS, wherein the mapping relationship comprises the first mapping relationship, and the first mapping relationship comprises: M preamble indexes are mapped to one PUSCH DMRS on one PUSCH time-frequency resource, M is a positive integer greater than 1;

a second mapping relationship of the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS; and

a third mapping relationship of a combination of the preamble index and the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS.

9. The information transmission method according to claim 8 , wherein the mapping relationship comprises the third mapping relationship; and

in a case that one synchronization signal block (SSB) is mapped to 1/Y random access channel (RACH) occasions (ROs), the third mapping relationship comprises:

the 1/Y ROs are mapped to one PUSCH time-frequency resource and one PUSCH DMRS; or,

one RO is mapped to one PUSCH time-frequency resource and one PUSCH DMRS; or,

Q preamble indexes in one RO are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

or, in a case that one SSB is mapped to one RO, the third mapping relationship comprises:

H preamble indexes in one RO are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

or, in a case that W SSBs are mapped to one RO, the third mapping relationship comprises:

R consecutive contention based random access (CBRA) preamble indexes are associated with one SSB, and are mapped to one PUSCH time-frequency resource and one PUSCH DMRS;

wherein, Y is a positive number less than 1; Q, H are a positive integer greater than or equal to 1; W, R are a positive integer greater than 1.

10. The information transmission method according to claim 8 , wherein, prior to the receiving the MsgA of the 2-step random access procedure sent by the terminal according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA, the method further comprises:

sending the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA of the 2-step random access procedure to the terminal via broadcast signaling or radio resource control (RRC) signaling.

11. The information transmission method according to claim 8 , wherein, subsequent to the receiving the MsgA of the 2-step random access procedure sent by the terminal according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA, the method further comprises:

performing PRACH preamble detection on the PRACH time-frequency resource;

in a case that a preamble is detected, obtaining, according to the mapping relationship, a target PUSCH time-frequency resource and a target PUSCH DMRS corresponding to a target PRACH time-frequency resource and/or a target preamble index selected by the terminal; and

performing PUSCH channel detection based on the target PUSCH time-frequency resource and the target PUSCH DMRS.

12. The information transmission method according to claim 8 , wherein, subsequent to the receiving the MsgA of the 2-step random access procedure sent by the terminal according to the mapping relationship between the preamble parameter and the PUSCH parameter in the MsgA, the method further comprises:

sending a random access response message to the terminal.

13. A terminal, comprising a transceiver, a memory, a processor and a computer program stored in the memory and configured to be executed by the processor, wherein the processor is configured to execute the computer program to implement following steps:

sending a message A (MsgA) of a 2-step random access procedure to a network device according to a mapping relationship between a preamble parameter and a physical uplink shared channel (PUSCH) parameter in the MsgA;

wherein the preamble parameter comprises a preamble index and a physical random access channel (PRACH) time-frequency resource, and the PUSCH parameter comprises a PUSCH time-frequency resource and a PUSCH demodulation reference signal (DMRS);

wherein the mapping relationship comprises:

a first mapping relationship of the preamble index to the PUSCH time-frequency resource and the PUSCH DMRS, wherein the mapping relationship comprises the first mapping relationship, and the first mapping relationship comprises: M preamble indexes are mapped to one PUSCH DMRS on one PUSCH time-frequency resource, M is a positive integer greater than 1;

a second mapping relationship of the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS; and

a third mapping relationship of a combination of the preamble index and the PRACH time-frequency resource to the PUSCH time-frequency resource and the PUSCH DMRS.

14. A network device, comprising a transceiver, a memory, a processor and a computer program stored in the memory and configured to be executed by the processor, wherein the computer program is executed by the processor to implement the steps of the information transmission method according to claim 8 wherein the preamble parameter comprises a preamble index and a physical random access channel (PRACH) time-frequency resource, and the PUSCH parameter comprises a PUSCH time-frequency resource and a PUSCH demodulation reference signal (DMRS).