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

Claim 0:
1. An operation method performed by a terminal in a communication system, the operation method comprising:
transmitting a random access message to a base station;
receiving, from the base station, a random access response (RAR) in response to the random access message within a window;
determining that a random access procedure is successfully performed when the RAR includes a random access preamble identifier (RAPID) of the random access message without backoff related information which is used for retransmitting the random access message;
determining a transmission timing of a hybrid automatic repeat request (HARQ) response in response to the RAR based on information indicating physical resources used for transmitting the HARQ response included in the RAR and a preconfigured value which is determined by the terminal; and
transmitting, to the base station, the HARQ response in response to the RAR in a physical uplink control channel (PUCCH) at the transmission timing,
wherein the HARQ response in response to the RAR is transmitted when the RAR includes the RAPID without an uplink grant.