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

Claim 2:
3. A user equipment (UE) in a wireless communication system, the UE comprising:
at least one transceiver;
at least one processor; and
at least one computer memory storing instructions which, when executed, cause the at least one processor to perform a two-step random access (RA) procedure comprising:
transmitting 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);
receiving a medium access control (MAC) protocol data unit (PDU),
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, the operations further comprises:
based on the MAC PDU including a success random access response (RAR) related to a contention resolution identity (CRID), and the CRID matches the CCCH SDU, determining whether a MAC SDU is present or not in the MAC PDU, based on a MAC SDU indicator associated with the success RAR; and
obtaining the MAC SDU based on the MAC SDU indicator set to a value indicating that the MAC SDU is present in the MAC PDU.