Patent ID: 11930526
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An operation method of a terminal in a communication system, the operation method comprising:
receiving random access channel (RACH) configuration information from a base station;
transmitting a first message A (MsgA) including a random access (RA) preamble #i selected based on the RACH configuration information and a payload to the base station;
transmitting a second MsgA including an RA preamble #k selected based on the RACH configuration information and a payload to the base station;
stopping repeated transmission operations of the MsgA when a message B (MsgB) including information indicating that an RA preamble #j is reserved is received within a response window; and
transmitting a third MsgA including the RA preamble #j and a payload to the base station for a preamble reservation period associated with the RA preamble #j,
wherein each of i, k, and j is a natural number, and
wherein the MsgB further includes information indicating that the preamble reservation period is activated.