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    Dynamic Adaptation of Reference Signal Transmissions in Wireless Communications
    343.
    发明申请
    Dynamic Adaptation of Reference Signal Transmissions in Wireless Communications 有权

    公开(公告)号：US20220271886A1

    公开(公告)日：2022-08-25

    申请号：US17438586

    申请日：2021-01-13

    Applicant: Apple Inc.

    Inventor： Hong He ,  Dawei Zhang ,  Wei Zeng ,  Haitong Sun ,  Chunhai Yao ,  Yushu Zhang ,  Seyed Ali Akbar Fakoorian ,  Oghenekome Oteri ,  Weidong Yang ,  Sigen Ye

    IPC: H04L5/00

    Abstract: Transmission of uplink demodulation reference signals (DMRSs) may be dynamically adapted for mobile devices. Downlink control information (DCI) that schedules uplink transmission(s) of the mobile device may include an information element (IE) corresponding to a DMRS to be transmitted by the UE during the uplink transmission(s). The IE enables the mobile device to determine when to transmit DMRSs during the scheduled uplink transmission(s). The mobile device may identify a corresponding DMRS pattern indicated by the IE, with the DMRS pattern defining how many DMRSs to transmit during the uplink transmission(s), how many DMRSs to transmit in a given time interval (TTI) bundle in the uplink transmission(s), how many DMRSs to transmit in a given repetition of the TTI bundle, and/or where the relative position(s) of the DMRSs are within the given repetition and the given TTI bundle. The DMRS patterns may be configured for the mobile device via higher layer signaling or may be hard-coded.

    Managing uplink transmission with multiple timing advance groups
    345.
    发明授权
    Managing uplink transmission with multiple timing advance groups 有权

    公开(公告)号：US12294964B2

    公开(公告)日：2025-05-06

    申请号：US17813792

    申请日：2022-07-20

    Applicant: Apple Inc.

    Inventor： Ankit Bhamri ,  Dawei Zhang ,  Sigen Ye ,  Wei Zeng ,  Yang Tang

    IPC: H04W56/00

    Abstract: This application relates to wireless communications, including methods and apparatus to manage uplink (UL) transmit switching with multiple timing advance groups (TAGs) for wireless devices. A wireless device is configured to select N≥2 radio frequency carriers for UL transmission from M>N available radio frequency carriers and subsequently send UL transmissions to a cellular wireless network based on the configuration. The M available radio frequency carriers are divided into distinct TAGs, each TAG having a distinct timing advance value, and the N radio frequency carriers belong to a single TAG. The wireless device is further configured to switch to a second set of N UL radio frequency carriers, after an uplink switching gap time period, based on a TAG medium access control (MAC) control element (CE), received the cellular wireless network, which specifies a second TAG from which to select the second set of N UL radio frequency carriers.

    Wireless device initiated channel occupancy in unlicensed spectrum
    346.
    发明授权
    Wireless device initiated channel occupancy in unlicensed spectrum 有权

    公开(公告)号：US12289606B2

    公开(公告)日：2025-04-29

    申请号：US17437909

    申请日：2020-10-15

    Applicant: Apple Inc.

    Inventor： Sigen Ye ,  Oghenekome Oteri ,  Weidong Yang ,  Wei Zeng ,  Hong He ,  Yushu Zhang ,  Haitong Sun ,  Huaning Niu ,  Chunhai Yao ,  Dawei Zhang

    IPC: H04W16/14 ,  H04W74/0808 ,  H04W76/10

    Abstract: This disclosure relates to techniques for a wireless device to initiate channel occupancy in unlicensed spectrum in a wireless communication system. The wireless device may establish a wireless link with a cellular base station. The wireless device may determine to perform an uplink transmission to the cellular base station on an unlicensed frequency channel. The wireless device may determine whether the cellular base station has channel occupancy of the unlicensed frequency channel. The wireless device may determine whether to initiate channel occupancy of the unlicensed frequency channel. The decision whether to initiate channel occupancy may be based at least in part on whether the cellular base station has channel occupancy of the unlicensed frequency channel.

    Beamforming failure detection and recovery in high mmwave systems
    350.
    发明授权
    Beamforming failure detection and recovery in high mmwave systems 有权

    公开(公告)号：US12262414B2

    公开(公告)日：2025-03-25

    申请号：US17441267

    申请日：2020-10-16

    Applicant: Apple Inc.

    Inventor： Oghenekome Oteri ,  Yushu Zhang ,  Huaning Niu ,  Weidong Yang ,  Sigen Ye ,  Haitong Sun ,  Chunxuan Ye ,  Chunhai Yao ,  Hong He ,  Wei Zeng ,  Dawei Zhang

    IPC: H04W74/08 ,  H04L5/00 ,  H04W74/04 ,  H04W74/0816 ,  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.

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