Random access method and device
View Patent ↗Provided are a random access network device and a device, which can improve the random access performance of a terminal device in an unlicensed spectrum. The network device includes: receiving, by a terminal device, a PDCCH, where the PDCCH includes PRACH resource indication information, the PRACH resource indication information is used for indicating a common PRACH resource scheduled by a network device, the PRACH resource indication information includes at least one of the following information: information of the PRACH resource, information of a synchronization signal block SSB associated with the PRACH resource, and information of a PRACH preamble transmitted on the PRACH resource; and sending, by the terminal device according to the PRACH resource indication information, a PRACH using the PRACH resource.
1. A random access method, the method comprising:
receiving, by a terminal device, a physical downlink control channel (PDCCH), wherein the PDCCH comprises physical random access channel (PRACH) resource indication information, the PRACH resource indication information comprises at least one of the following information: information of a PRACH resource, information of a synchronization signal block (SSB) associated with the PRACH resource, and information of a PRACH preamble transmitted on the PRACH resource; and
determining, by the terminal device according to the PRACH resource indication information, the PRACH resource scheduled by a network device for the terminal device, and sending a PRACH using the PRACH resource;
wherein the SSB has an SSB position index and an SSB quasi-co-located (QCL) index, and the SSB position index is used for indicating a position for sending the SSB in a candidate SSB position, the SSB QCL index is used for indicating information of a QCL relationship of the SSB; there is an association relationship among the SSB position index, the SSB QCL index and the PRACH resource.
2. The method according to claim 1 , wherein the information of the SSB comprises the SSB QCL index.
3. The method according to claim 2 , wherein SSBs with a same SSB QCL index are associated with a same PRACH resource.
4. The method according to claim 2 , wherein the SSB QCL index=Mod (the SSB position index, Q), wherein the Q is a maximum number of SSBs without a QCL relationship sent within a time window.
5. The method according to claim 4 , wherein the Q is carried in system information or a demodulation reference signal (DMRS) of a physical broadcast channel (PBCH); or the Q is preconfigured.
6. The method according to claim 1 , wherein the information of the PRACH preamble comprises an index of the PRACH preamble.
7. A random access method, the method comprising:
sending, by a network device, a physical downlink control channel (PDCCH), wherein the PDCCH comprises physical random access channel (PRACH) resource indication information, the PRACH resource indication information comprises at least one of the following information: information of a PRACH resource, information of a synchronization signal block (SSB) associated with the PRACH resource, and information of a PRACH preamble transmitted on the PRACH resource; and
receiving, by the network device, a PRACH which is sent by the terminal device using the PRACH resource;
wherein the SSB has an SSB position index and a SSB quasi-co-located (QCL) index, and the SSB position index is used for indicating a position for sending the SSB in a candidate SSB position, the SSB QCL index is used for indicating information of a QCL relationship of the SSB; there is an association relationship among the SSB position index, the SSB QCL index and the PRACH resource.
8. The method according to claim 7 , wherein the information of the SSB comprises the SSB QCL index.
9. The method according to claim 8 , wherein SSBs with a same SSB QCL index are associated with a same PRACH resource.
10. The method according to claim 8 , wherein the SSB QCL index=Mod (the SSB position index, Q), wherein the Q is a maximum number of SSBs without a QCL relationship sent within a time window.
11. The method according to claim 10 , wherein the Q is carried in system information or a demodulation reference signal (DMRS) of a physical broadcast channel (PBCH); or the Q is preconfigured.
12. The method according to claim 7 , wherein the information of the PRACH preamble comprises an index of the PRACH preamble.
13. A terminal device, the terminal device comprising a processor and a memory, the processor is configured to store a computer program, the processor is configured to call and run the computer program stored in the memory to:
control an input interface to receive a physical downlink control channel (PDCCH), wherein the PDCCH comprises a physical random access channel (PRACH) resource indication information, the PRACH resource indication information comprises at least one of the following information: information of a PRACH resource, information of a synchronization signal block (SSB) associated with the PRACH resource, and information of a PRACH preamble transmitted on the PRACH resource; and
determine, according to the PRACH resource indication information, the PRACH resource scheduled by a network device for the terminal device, and send a PRACH using the PRACH resource;
wherein the SSB has an SSB position index and a SSB quasi-co-located (QCL) index, and the SSB position index is used for indicating a position for sending the SSB in a candidate SSB position, the SSB QCL index is used for indicating information of a QCL relationship of the SSB; there is an association relationship among the SSB position index, the SSB QCL index and the PRACH resource.
14. The terminal device according to claim 13 , wherein the information of the SSB comprises the SSB QCL index.
15. The terminal device according to claim 14 , wherein SSBs with a same SSB QCL index are associated with a same PRACH resource.
16. The terminal device according to claim 14 , wherein the SSB QCL index=Mod (the SSB position index, Q), wherein the Q is a maximum number of SSBs without the QCL relationship sent within a time window.
17. The terminal device according to claim 16 , wherein the Q is carried in system information or a demodulation reference signal (DMRS) of a physical broadcast channel (PBCH); or the Q is preconfigured.
18. The terminal device according to claim 13 , wherein the information of the PRACH preamble comprises an index of the PRACH preamble.
19. A network device, the network device comprising a processor and a memory, the memory is configured to store a computer program, the processor is configured to call and run the computer program stored in the memory to:
control an output interface to send a physical downlink control channel (PDCCH), wherein the PDCCH comprises physical random access channel (PRACH) resource indication information, the PRACH resource indication information comprises at least one of the following information: information of a PRACH resource, information of a synchronization signal block (SSB) associated with the PRACH resource, and information of a PRACH preamble transmitted on the PRACH resource; and
control an input interface to receive a PRACH which is sent by the terminal device using the PRACH resource;
wherein the SSB has an SSB position index and a SSB quasi-co-located (QCL) index, and the SSB position index is used for indicating a position for sending the SSB in a candidate SSB position, the SSB QCL index is used for indicating information of a QCL relationship of the SSB; there is an association relationship among the SSB position index, the SSB QCL index and the PRACH resource.
20. The network device according to claim 19 , wherein the information of the SSB comprises the SSB QCL index.
21. The network device according to claim 20 , wherein SSBs with a same SSB QCL index are associated with a same PRACH resource.
22. The network device according to claim 20 , wherein the SSB QCL index=Mod (the SSB position index, Q), wherein the Q is a maximum number of SSBs without a QCL relationship sent within a time window.
23. The network device according to claim 22 , wherein the Q is carried in system information or a demodulation reference signal (DMRS) of a physical broadcast channel (PBCH); or the Q is preconfigured.
24. The network device according to claim 19 , wherein the information of the PRACH preamble comprises an index of the PRACH preamble.