Random access method and device

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.

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.

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.