Patent ID: 11930534
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. An operation method performed by a base station, the operation method comprising:
receiving a random access message from a terminal;
generating a random access response (RAR) including a random access preamble identifier (RAPID) of the random access message and information indicating physical resources used for transmitting a hybrid automatic repeat request (HARQ) response in response to the RAR without backoff related information which is used for retransmitting the random access message when a random access procedure is successfully performed;
transmitting the RAR in response to the random access message to the terminal;
determining a reception timing of the HARQ response in response to the RAR based on the information included in the RAR and a preconfigured value which is determined by the base station; and
receiving, from the terminal, the HARQ response in response to the RAR in a physical uplink control channel (PUCCH) at the reception timing,
wherein the HARQ response in response to the RAR is received when the RAR includes the RAPID without an uplink grant.