US 11,864,038 B2
Method and user equipment for performing initial beam alignment during random access (RACH) procedure
Mangesh Abhimanyu Ingale, Yongin-si (KR); and Anil Agiwal, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 16/496,294
Filed by Samsung Electronics Co., Ltd, Suwon-si (KR)
PCT Filed Mar. 22, 2018, PCT No. PCT/KR2018/003382
§ 371(c)(1), (2) Date Sep. 20, 2019,
PCT Pub. No. WO2018/174609, PCT Pub. Date Sep. 27, 2018.
Claims priority of application No. 201741010064 (IN), filed on Mar. 22, 2017; and application No. 201741010064 (IN), filed on Mar. 21, 2018.
Prior Publication US 2020/0053607 A1, Feb. 13, 2020
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01); H04W 74/08 (2009.01)
CPC H04W 36/0072 (2013.01) [H04W 36/0058 (2018.08); H04W 36/08 (2013.01); H04W 74/0833 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of performing initial beam alignment during a random access procedure by a terminal, the method comprising:
transmitting, on a serving cell, a measurement report message including beam measurement information associated with a target cell, in response to a measurement reporting event triggered;
receiving, on a serving cell, a handover command message including a resource configuration of channel state information reference signals (CSI-RSs) associated with the target cell for an initial access beam alignment;
performing downlink (DL) synchronization with the target cell based on synchronization signal (SS) blocks; and
transmitting, on the target cell, a random access preamble corresponding to a CSI-RS which is selected from the CSI-RSs by measuring a subset of the CSI-RSs transmitted on the target cell, the selected CSI-RS corresponding to a best beam of the target cell.