US 12,471,147 B2
Method and apparatus for acquiring and maintaining synchronization in communication systems
Yong Sun Kim, Daejeon (KR); Kap Seok Chang, Daejeon (KR); and Young Jo Ko, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)
Filed on Nov. 2, 2021, as Appl. No. 17/517,526.
Claims priority of application No. 10-2020-0148129 (KR), filed on Nov. 6, 2020; application No. 10-2021-0094452 (KR), filed on Jul. 19, 2021; and application No. 10-2021-0131011 (KR), filed on Oct. 1, 2021.
Prior Publication US 2022/0150974 A1, May 12, 2022
Int. Cl. H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) 16 Claims
OG exemplary drawing
 
1. An operation method of a terminal in a communication system, the operation method comprising:
receiving, from a first base station, information on preambles for random access;
transmitting, to the first base station, a first message including a preamble selected based on the information on the preambles;
receiving, from the first base station, a second message that is a response signal for the first message;
transmitting, to the first base station, a third message requesting a preemptive use of the selected preamble during a first preemptive use period; and
receiving, from the first base station, a fourth message allowing the preemptive use of the selected preamble during the first preemptive use period, and performing a random access procedure by using the selected preamble during the first preemptive use period.