	US 12,225,591 B2
	Method and apparatus for initial access in communication system
Jung Hoon Lee, Daejeon (KR); Cheul Soon Kim, Daejeon (KR); and Sung Hyun Moon, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Feb. 25, 2022, as Appl. No. 17/681,290.
Claims priority of application No. 10-2021-0026549 (KR), filed on Feb. 26, 2021; application No. 10-2021-0060503 (KR), filed on May 11, 2021; application No. 10-2021-0103456 (KR), filed on Aug. 5, 2021; application No. 10-2021-0131220 (KR), filed on Oct. 1, 2021; application No. 10-2021-0150839 (KR), filed on Nov. 4, 2021; and application No. 10-2022-0018116 (KR), filed on Feb. 11, 2022.
Prior Publication US 2022/0279590 A1, Sep. 1, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 72/0446 (2023.01)

CPC H04W 74/0833 (2013.01) [H04W 72/0446 (2013.01)]

12 Claims

1. An operation method of a terminal in a communication system, the operation method comprising:

receiving, from a base station, a first synchronization signal block (SSB);

determining a random access channel (RACH) occasion (RO) associated with the first SSB;

transmitting, to the base station, a physical random access channel (PRACH) preamble in the RO within a first radio resource to which a first subcarrier spacing (SCS) is applied;

determining a position of a slot to which the RO belongs in a reference radio resource to which a reference SCS is applied;

determining a radio network temporary identifier (RNTI) for a random access (RA) procedure based on a slot index corresponding to the position of the slot in the reference radio resource; and

performing a reception operation of a response for the PRACH preamble by using the RNTI in the first radio resource.