Random access method, apparatus, and system

An apparatus, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
• receive a synchronization signal block SSB;
• obtain sweeping periodicity information, wherein the sweeping periodicity information comprises a sequence number of an SSB burst set to which the SSB belongs;
• and
• send the sweeping periodicity information.

An apparatus, comprising:

• at least one processor;
• and
• one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
• obtain first sweeping periodicity information, wherein the first sweeping periodicity information comprises a sequence number of a synchronization signal block SSB burst set to which a first SSB belongs;
• and
• send a random access message at a beam position of a terminal device based on the first sweeping periodicity information.