US 10,368,373 B2
Beam selection and refinement during a random access channel (RACH) procedure
Sumeeth Nagaraja, San Diego, CA (US); and Tao Luo, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jul. 21, 2017, as Appl. No. 15/656,576.
Claims priority of provisional application 62/366,595, filed on Jul. 25, 2016.
Prior Publication US 2018/0027594 A1, Jan. 25, 2018
Int. Cl. H04B 7/08 (2006.01); H04W 72/04 (2009.01); H04W 16/28 (2009.01); H04W 74/08 (2009.01); H04B 7/06 (2006.01)
CPC H04W 74/0833 (2013.01) [H04B 7/0695 (2013.01); H04B 7/088 (2013.01); H04B 7/0811 (2013.01); H04W 16/28 (2013.01); H04W 72/046 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A method for wireless communication by a node B (NB), comprising:
transmitting, by the NB, a first one or more directional beams to enable a user equipment (UE) to select a first beam;
receiving, by the NB, a message via the first beam from the UE as part of a random access channel (RACH) procedure; and
transmitting, by the NB, a second one or more directional beams for beam refinement during the RACH procedure, wherein the second one or more directional beams enable the UE to switch to a second beam, wherein the second beam is a narrower beam within the first beam.