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

Claim 13:
14. An operation method of a base station in a communication system, the operation method comprising:
transmitting radio access channel (RACH) configuration information to a terminal, wherein the RACH configuration information includes configuration information of a group A1, which indicates one or more of a number and indices of RA preambles belonging to the group A1;
receiving a first message A (MsgA) including a random access (RA) preamble #i and a payload from the terminal, wherein the RA preamble #i belongs to a group A1 consisting of RA preambles used for data transmission;
transmitting a message B (MsgB) including information indicating the RA preamble #i to the terminal; and
receiving a second MsgA including the RA preamble #i and data from the terminal in a preamble reservation period,
wherein i is a natural number.