# US 12,010,728 B2 · Random access method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,728 B2 - Document ID: US12010728B2 - Status: Granted - Kind: B2 - Application number: 17/521,387 - Filed: 2021-11-08 - Published: 2022-02-24 - Granted: 2024-06-11 - Earliest claimed: 2019-06-14 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Chuanfeng He - Web page: https://patentgrep.com/patent/US12010728B2 ## CPC - H04W 56/001: {Synchronization between nodes} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/002: {Transmission of channel access control information} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The method according to claim 1, wherein the information of the SSB comprises the SSB QCL index. ### Claim 3 (depends on 2) The method according to claim 2, wherein SSBs with a same SSB QCL index are associated with a same PRACH resource. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 4) 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. ### Claim 6 (depends on 1) The method according to claim 1, wherein the information of the PRACH preamble comprises an index of the PRACH preamble. ### Claim 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. ### Claim 8 (depends on 7) The method according to claim 7, wherein the information of the SSB comprises the SSB QCL index. ### Claim 9 (depends on 8) The method according to claim 8, wherein SSBs with a same SSB QCL index are associated with a same PRACH resource. ### Claim 10 (depends on 8) 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. ### Claim 11 (depends on 10) 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. ### Claim 12 (depends on 7) The method according to claim 7, wherein the information of the PRACH preamble comprises an index of the PRACH preamble. ### Claim 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. ### Claim 14 (depends on 13) The terminal device according to claim 13, wherein the information of the SSB comprises the SSB QCL index. ### Claim 15 (depends on 14) The terminal device according to claim 14, wherein SSBs with a same SSB QCL index are associated with a same PRACH resource. ### Claim 16 (depends on 14) 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. ### Claim 17 (depends on 16) 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. ### Claim 18 (depends on 13) The terminal device according to claim 13, wherein the information of the PRACH preamble comprises an index of the PRACH preamble. ### Claim 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. ### Claim 20 (depends on 19) The network device according to claim 19, wherein the information of the SSB comprises the SSB QCL index. ### Claim 21 (depends on 20) The network device according to claim 20, wherein SSBs with a same SSB QCL index are associated with a same PRACH resource. ### Claim 22 (depends on 20) 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. ### Claim 23 (depends on 22) 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. ### Claim 24 (depends on 19) The network device according to claim 19, wherein the information of the PRACH preamble comprises an index of the PRACH preamble.