Invention Application
- Patent Title: SYSTEM AND METHOD FOR BEAM FAILURE RECOVERY REQUEST
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Application No.: US17438663Application Date: 2020-05-01
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Publication No.: US20220158766A1Publication Date: 2022-05-19
- Inventor: Yushu Zhang , Guotong Wang , Gang Xiong , Yingyang Li , Alexei Davydov
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- International Application: PCT/US2020/031068 WO 20200501
- Main IPC: H04L1/16
- IPC: H04L1/16 ; H04L5/00 ; H04L1/00

Abstract:
Systems, devices, and techniques for beamforming in wireless communication systems are described. A described technique performed by a user equipment (UE) includes monitoring a downlink reference signal from a base station; transmitting, via a physical uplink shared channel (PUSCH) associated with a hybrid automatic repeat request (HARQ) process number, a beam failure recovery request (BFRQ) in response to a change in a quality of the downlink reference signal, wherein the BFRQ comprises new beam information; receiving, by the UE, a downlink control information (DCI) message to trigger a PUSCH transmission corresponding to the HARQ process number; and transmitting, by the UE after at least a predetermined number of symbols from a last symbol of a physical downlink control channel (PDCCH) reception containing the DCI message, information via a PUCCH in accordance with the new beam information. The UE can apply the new beam information to uplink and downlink channels.
Public/Granted literature
- US12101187B2 System and method for beam failure recovery request Public/Granted day:2024-09-24
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