US 12,301,326 B2
Methods and apparatus for beam control in beamformed systems
Yugeswar Deenoo, Chalfont, PA (US); Tao Deng, Roslyn, NY (US); Janet A. Stern-Berkowitz, Little Neck, NY (US); Moon-il Lee, Melville, NY (US); Mihaela C. Beluri, Jericho, NY (US); and Ravikumar V. Pragada, Warrington, PA (US)
Assigned to INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
Filed by INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
Filed on May 23, 2022, as Appl. No. 17/751,356.
Application 17/751,356 is a continuation of application No. 16/081,491, granted, now 11,394,447, previously published as PCT/US2017/020384, filed on Mar. 2, 2017.
Claims priority of provisional application 62/302,962, filed on Mar. 3, 2016.
Prior Publication US 2022/0286187 A1, Sep. 8, 2022
Int. Cl. H04W 4/00 (2018.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04L 5/00 (2006.01); H04W 72/23 (2023.01)
CPC H04B 7/0695 (2013.01) [H04B 7/088 (2013.01); H04L 5/0023 (2013.01); H04L 5/0033 (2013.01); H04L 5/005 (2013.01); H04L 5/0051 (2013.01); H04L 5/0053 (2013.01); H04L 5/0055 (2013.01); H04L 5/0069 (2013.01); H04W 72/23 (2023.01)] 10 Claims
OG exemplary drawing
 
1. A wireless transmit/receive unit (WTRU), comprising:
a transceiver; and
a processor,
wherein the transceiver and the processor are configured to perform physical downlink control channel (PDCCH) monitoring using a first beam,
wherein the processor and the transceiver are further configured to detect beam failure of the first beam,
wherein the processor and the transceiver are further configured to, based on detecting the beam failure of the first beam, send a random access transmission to a base station, wherein the random access transmission indicates a request for a beam switch and a preferred second beam,
wherein the transceiver and the processor are further configured to receive signalling from the base station, wherein the signalling comprises a medium access control (MAC) command, and
wherein the transceiver and the processor are further configured to:
send an acknowledgement (ACK) to the base station, and
receive control information in a transmission on a PDCCH using the preferred second beam.