US 12,089,097 B2
User equipment (UE) and method for performing random access for beamforming-based connected mode handover
Saidhiraj Amuru, Bangalore (IN); Atanu Guchhait, Bangalore (IN); and Anshuman Nigam, Bangalore (IN)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Nov. 17, 2021, as Appl. No. 17/528,740.
Application 17/528,740 is a continuation of application No. 16/471,366, granted, now 11,212,718, previously published as PCT/KR2017/015434, filed on Dec. 26, 2017.
Claims priority of application No. 201641044292 (IN), filed on Dec. 26, 2016; and application No. 2016 41044292 (IN), filed on Dec. 18, 2017.
Prior Publication US 2022/0078678 A1, Mar. 10, 2022
Int. Cl. H04W 36/00 (2009.01); H04L 5/00 (2006.01); H04W 74/08 (2024.01); H04W 74/0833 (2024.01)
CPC H04W 36/0072 (2013.01) [H04L 5/0053 (2013.01); H04W 36/0058 (2018.08); H04W 74/0833 (2013.01); H04W 74/0891 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) in a communication system, the method comprising:
transmitting, to a source base station, a measurement report for measurement of at least one neighboring cell;
receiving, from the source base station, a radio resource control (RRC) connection reconfiguration message for handover, wherein the RRC connection reconfiguration message is associated with the measurement report, and wherein the RRC connection reconfiguration message includes information on association between at least one synchronization signal block (SSB) of a target base station for the handover and dedicated random access channel (RACH) resources for contention free random access (CFRA) of the target base station; and
transmitting, to the target base station, a random access preamble associated with the CFRA on a RACH resource among the dedicated RACH resources for the CFRA,
wherein the RACH resource is identified based on an SSB among the at least one SSB and the association, and
wherein power ramping for transmission power of a retransmission of the random access preamble is identified based on an uplink beam associated with the retransmission of the random access preamble.