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    Techniques for acknowledgment of transmissions in a wireless communication system
    22.
    发明授权
    Techniques for acknowledgment of transmissions in a wireless communication system 有权

    公开(公告)号：US10326559B2

    公开(公告)日：2019-06-18

    申请号：US15485656

    申请日：2017-04-12

    Applicant: QUALCOMM Incorporated

    Inventor： Zhifei Fan ,  Xiaoxia Zhang ,  Taesang Yoo ,  Jing Sun ,  Juan Montojo

    IPC: H04W4/00 ,  H04L1/18 ,  H04L1/00 ,  H04W72/12 ,  H04W74/08 ,  H04L1/16 ,  H04L5/00 ,  H04L5/14

    Abstract: A base station may provide both an uplink grant and a downlink grant in a same transmission time interval (TTI), and may provide an indication in the uplink grant that the TTI includes the downlink grant. A user equipment (UE) that receives the uplink grant may provide feedback using identified feedback resources in an uplink shared channel, and other uplink transmissions may be rate matched around the feedback resources in the uplink shared channel. A base station receiving the feedback may monitor the feedback resources to determine whether the downlink grant or one or more of the downlink transmissions were successfully received at the UE. A base station, in some examples, may monitor different sets of resources to determine whether certain of the uplink grant, downlink grant, downlink transmissions associated with the downlink grant, or any combinations thereof, have been successfully received at the UE.

    UPLINK POWER CONTROL IN WIRELESS SYSTEMS
    23.
    发明申请
    UPLINK POWER CONTROL IN WIRELESS SYSTEMS 审中-公开

    公开(公告)号：US20190124598A1

    公开(公告)日：2019-04-25

    申请号：US16162185

    申请日：2018-10-16

    Applicant: QUALCOMM Incorporated

    Inventor： Seyed Ali Akbar Fakoorian ,  Xiaoxia Zhang ,  Taesang Yoo ,  Zhifei Fan

    IPC: H04W52/14 ,  H04W52/10 ,  H04L25/02 ,  H04B7/024 ,  H04L5/00 ,  H04W72/04

    Abstract: Methods, systems, and devices for wireless communications are described. A base station may determine a set of power control parameters for a user equipment (UE) to use in different power control loops. The base station may indicate a power control process for the UE to perform in downlink control information. The UE may identify a subset of the power control parameters to use in a power control loop for the indicated process. In some examples, the power control parameters may be for different sounding reference signal processes, such as uplink channel sounding, downlink channel sounding with channel reciprocity, or cross-link interference. In some other examples, the power control parameters may be for power control loops of different uplink channel configuration. The base station may convey the set of power control parameters to the UE by radio resource control signaling.

    OVER-THE-AIR PHASE SYNCHRONIZATIN FOR RECIPROCITY-BASED COMP JOINT TRANSMISSION
    24.
    发明申请
    OVER-THE-AIR PHASE SYNCHRONIZATIN FOR RECIPROCITY-BASED COMP JOINT TRANSMISSION 审中-公开

    公开(公告)号：US20180317186A1

    公开(公告)日：2018-11-01

    申请号：US15830760

    申请日：2017-12-04

    Applicant: QUALCOMM Incorporated

    Inventor： Zhifei Fan ,  Taesang Yoo ,  Xiaoxia Zhang ,  Seyed Ali Akbar Fakoorian

    IPC: H04W56/00 ,  H04L5/00

    CPC classification number: H04W56/001 ,  H04B7/0626 ,  H04J11/0053 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/0035

    Abstract: Over-the-air phase synchronization for reciprocity-based coordinated multipoint (CoMP) joint transmission is discussed. The base stations of the CoMP group and served user equipment (UEs) each transmit phase synchronization reference signals (PSRS). The receiving nodes will compute co-phasing values representing the phase difference between pairs of the PSRS. For example, the difference between two downlink PSRS computed at the UE for a downlink co-phasing value, and the difference between a single PSRS received at two base stations computed at the base station for an uplink co-phasing value. The base stations of the CoMP group may determine a phase compensation by computing the differences between the uplink and downlink co-phasing values and use that phase compensation to adjust communications by the base stations in the CoMP group. In other aspects, the computed co-phasing values may be used to modulate each nodes transmission of its respective PSRS.

    TIMING ADVANCE DESIGN FOR ENHANCED COMPONENT CARRIER
    26.
    发明申请
    TIMING ADVANCE DESIGN FOR ENHANCED COMPONENT CARRIER 审中-公开

    公开(公告)号：US20170289938A1

    公开(公告)日：2017-10-05

    申请号：US15474883

    申请日：2017-03-30

    Applicant: QUALCOMM Incorporated

    Inventor： Taesang Yoo ,  Juan Montojo ,  Jing Sun ,  Zhifei Fan

    IPC: H04W56/00 ,  H04L5/00 ,  H04L5/14

    CPC classification number: H04W56/007 ,  H04L5/001 ,  H04L5/1469 ,  H04W56/0005 ,  H04W72/044 ,  H04W72/12 ,  H04W74/002

    Abstract: Methods, systems, and devices for wireless communication are described. A base station may establish a transmission gap between downlink (DL) and uplink (UL) transmissions on a shared radio frequency (RF) spectrum band using time division duplex (TDD). A length of the gap may be based at least in part on a maximum allowed length of a filler signal corresponding to a coverage area of the base station. To reserve the shared band, a user equipment (UE) may communicate the filler signal for a length of time that is based at least in part on the maximum allowed length and a geographic distance between the UE and the base station. UEs farther from the base station transmit the filler signal of shorter lengths before sending an UL transmission, so that the UL transmissions from different UEs arrive at the same time at the base station regardless of the geographic distance between the UEs.

    Techniques for providing UE-assistance for a selection of a demodulation reference signal port multiplexing pattern
    28.
    发明授权
    Techniques for providing UE-assistance for a selection of a demodulation reference signal port multiplexing pattern 有权

    公开(公告)号：US12273292B2

    公开(公告)日：2025-04-08

    申请号：US17575363

    申请日：2022-01-13

    Applicant: QUALCOMM Incorporated

    Inventor： Wooseok Nam ,  Xiaoxia Zhang ,  Ahmed Abdelaziz Ibrahim Abdelaziz Zewail ,  Zhifei Fan ,  Tao Luo ,  Jing Sun ,  Jun Ma

    IPC: H04L5/00 ,  H04J13/16

    Abstract: Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may measure a frequency selectivity of a channel between the UE and a base station and may transmit signaling to the base station indicating one or both of a frequency selectivity metric or a recommended demodulation reference signal (DMRS) port multiplexing pattern based on measuring the frequency selectivity. In some aspects, the UE may transmit the signaling to assist the base station in configuring a DMRS port multiplexing pattern based on current channel conditions. For example, if the frequency selectivity metric satisfies a threshold, the UE may recommend a DMRS port multiplexing pattern absent of code division multiplexing (CDM). Alternatively, if the frequency selectivity metric fails to satisfy the threshold, the UE may recommend a DMRS port multiplexing patter including CDM.

    Precoded phase tracking reference signal sequence with distributed allocation
    29.
    发明授权
    Precoded phase tracking reference signal sequence with distributed allocation 有权

    公开(公告)号：US12137017B2

    公开(公告)日：2024-11-05

    申请号：US17727378

    申请日：2022-04-22

    Applicant: QUALCOMM Incorporated

    Inventor： Xiaoxia Zhang ,  Ahmed Abdelaziz Ibrahim Abdelaziz Zewail ,  Zhifei Fan ,  Tianyang Bai ,  Tao Luo ,  Jing Sun

    IPC: H04L27/26 ,  H04L5/00

    Abstract: Methods, systems, and devices for wireless communications are described. A device may precode a phase tracking reference signal (PTRS) sequence by applying a single discrete Fourier transform (DFT) to the PTRS sequence. The device may map the DFT precoded PTRS sequence to a subset of resources of a set of resources, and may transmit a signal carrying the DFT precoded PTRS sequence. Additionally or alternatively, the device may receive a signal that includes a DFT precoded PTRS sequence, demap the DFT precoded PTRS sequence to a subset of resources of a set of resources, decode the DFT precoded PTRS by applying a single inverse DFT (IDFT) to the DFT precoded PTRS sequence, estimate a phase error based on the decoding, and apply a phase error correction to a set of additional symbols associated with the signal based on the estimated phase error.

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