公开(公告)号：US20230239924A1

公开(公告)日：2023-07-27

申请号：US17441267

申请日：2020-10-16

Applicant: Apple Inc.

Inventor： Oghenekome YAO ,  Yushu ZHANG ,  Huaning NIU ,  Weidong YANG ,  Sigen YE ,  Haitong SUN ,  Chuxuan YE ,  Chunhai YAO ,  Hong HE ,  Wei ZENG ,  Dawei ZHANG

IPC: H04W74/08 ,  H04W74/04 ,  H04L5/00 ,  H04W76/19

CPC classification number: H04W74/0816 ,  H04W74/04 ,  H04L5/0051 ,  H04W76/19

Abstract: Beam determination refers to a set of procedures for an access node (AN) and a user equipment (UE) to select from among downlink communication beams and/or uplink communication beams for downlink and/or uplink communications, respectively. Often times, the downlink communication beams can include one or more downlink control channels, for example, a Physical Downlink Control Channel (PDCCH) and/or a Physical Downlink Shared Channel (PDSCH), to provide downlink reference signals, such as channel-state information reference signals (CSI-RSs), to the UE. The AN can execute various exemplary downlink beam scheduling procedures to control the transmission of the downlink reference signals, such as the CSI-RSs to provide an example, over the downlink communication beams. In some embodiments, the UE can utilize the CSI-RSs to perform beamforming failure detection (BFD) and beamforming failure recovery (BFR) in the wireless networks.