Patent ID: 11924891
Assignee: LG ELECTRONICS INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A method performed by a base station (BS) in a wireless communication system, the method comprising:
transmitting a medium access control (MAC) protocol data unit (PDU) of a two-step random access (RA) procedure that includes:
receiving a random access preamble (RAP) and a common control channel (CCCH) service data unit (SDU) using a physical random access channel (PRACH) and a physical uplink channel (PUSCH) from a user equipment (UE);
transmitting the MAC PDU to the UE,
wherein, a MAC subheader included in the MAC PDU comprises a first type field indicating whether the MAC subheader includes a RAP identity (RAP ID),
wherein, based on the first type field not indicating that the MAC subheader includes the RAP ID, the MAC subheader further comprises a second type field indicating whether the MAC subheader includes a backoff indicator (BI), and
wherein, based on the second type field not indicating that the MAC subheader includes the BI, based on the MAC PDU including a success random access response (RAR) related to a contention resolution identity (CRID) which matches the CCCH SDU:
a MAC SDU indicator associated with the success RAR is set to a first value based on the MAC PDU including a MAC SDU, and
the MAC SDU indicator is set to a second value based on the MAC PDU not including the MAC SDU.