US 11,943,677 B2
Beam selection and radio link failure during beam recovery
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 Sep. 18, 2017, as Appl. No. 15/707,626.
Claims priority of provisional application 62/465,112, filed on Feb. 28, 2017.
Claims priority of provisional application 62/448,369, filed on Jan. 19, 2017.
Prior Publication US 2018/0206170 A1, Jul. 19, 2018
Int. Cl. H04W 36/30 (2009.01); H04B 7/0408 (2017.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04W 16/28 (2009.01); H04W 76/19 (2018.01); H04W 76/27 (2018.01); H04W 36/00 (2009.01); H04W 36/06 (2009.01); H04W 36/18 (2009.01)
CPC H04W 36/305 (2018.08) [H04B 7/0408 (2013.01); H04B 7/0695 (2013.01); H04B 7/088 (2013.01); H04W 16/28 (2013.01); H04W 76/19 (2018.02); H04W 76/27 (2018.02); H04W 36/0005 (2013.01); H04W 36/0088 (2013.01); H04W 36/06 (2013.01); H04W 36/18 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for wireless communications performed by a base station (BS), comprising:
communicating using beamforming with a user equipment (UE) via an active beam;
sending a configuration in a radio resource control (RRC) signal to the UE, the configuration indicating one or more alternative beams for the UE to use to send one or more beam recovery messages to the BS when a beam failure associated with the active beam is detected at the UE and indicating a threshold for the UE to use for selecting an alternative beam from the one or more alternative beams, wherein the threshold comprises a directional threshold and a reference signal received power (RSRP) threshold associated with a channel state information reference signal and a synchronization signal, wherein when no alternative beam of the one or more alternative beams meets the directional threshold, the configuration indicates a best alternative beam of the one or more alternative beams based on the RSRP threshold;
receiving, from the UE after sending the configuration, a beam recovery message via at least one of the one or more alternative beams, wherein the beam recovery message includes a random access channel message; and
performing a random access channel procedure, based on the beam recovery message, with the UE via the at least one of the one or more alternative beams.