ENHANCED PHYSICAL STRUCTURE FOR LTE V2V COMMUNICATIONS

    公开(公告)号:US20230075631A1

    公开(公告)日:2023-03-09

    申请号:US17894238

    申请日:2022-08-24

    Applicant: Apple Inc.

    Abstract: A vehicle may wirelessly communicate with another vehicle via a physical channel (a vehicle-to-vehicle (V2V) channel) that is robust and reliable under high mobility propagation conditions. The physical channel may be created by modifying an existing long-term evolution (LTE) physical channel, such as an LTE sidelink (SL) channel. For instance, the V2V physical channel may be created by increasing, by a particular factor, the subcarrier spacing of legacy LTE channels (e.g., from 15 kilohertz (kHz) to 30 kHz). Additionally, a symbol duration and a fast physical channel may each be reduced by Fourier transform (FFT) size for the V2V the same factor. Doing so may enable the V2V physical channel to be implemented without significant modifications to other aspects of the LTE standard.

    V2X Performance Enhancements in High Speed Environments

    公开(公告)号:US20230050470A1

    公开(公告)日:2023-02-16

    申请号:US17864316

    申请日:2022-07-13

    Applicant: Apple Inc.

    Abstract: Implementations of this disclosure generally may relate to the field of wireless communications. More specifically, implementations described in this disclosure relate to different 3GPP LTE and LTE-A system enhancements to address the issue and support reliable V2X operation in the high mobility environments. Several solutions to improve the V2X system performance in the high mobility vehicular channel propagation conditions are described. Some aspects relate to the suggestion of a new DMRS patterns within individual subframes that promote more accurate CFO estimation. Moreover, another aspect provides DMRS mapping or puncturing patterns to transmit individual DMRS in a periodic pattern on respective OFDM/SC-FDMA symbols so that they do not occupy all REs of the OFDM/SC-FDMA symbols, respectively.

    Synchronization for sidelink based on prioritization of synchronization signals

    公开(公告)号:US11533695B2

    公开(公告)日:2022-12-20

    申请号:US17259126

    申请日:2019-08-08

    Applicant: Apple Inc.

    Abstract: Embodiments of a User Equipment (UE) and methods of communication are generally described herein. The UE may attempt to detect synchronization signals, including Long Term Evolution (LTE) synchronization signals from eNBs, New Radio (NR) synchronization signals from gNBs, and sidelink synchronization signals (SLSSs) from other UEs. The UE may prioritize an LTE synchronization signal over an SLSS, and may prioritize an NR synchronization signal over an SLSS. If the UE does not detect an LTE synchronization signal or an NR synchronization signal, the UE may select an SLSS. The UE may prioritize an SLSS from a UE that is directly synchronized to an eNB or a gNB over an SLSS from another UE that is indirectly synchronized to an eNB or a gNB.

    MEASUREMENT AND PROCEDURES FOR NR POSITIONING

    公开(公告)号:US20220159415A1

    公开(公告)日:2022-05-19

    申请号:US17310934

    申请日:2020-04-01

    Applicant: APPLE INC.

    Abstract: User equipment (UE) positioning within a 5G New Radio (NR) network may be determined by receiving a downlink (DL) position reference signal (PRS) resource set indicating a plurality of DL PRS resources and receiving a DL PRS report configuration that indicates a set of measurements to be performed by a UE for each of the plurality of DL PRS resources within the DL PRS resource set. Position measurements may be performed for each of the plurality of DL PRS resources within the DL PRS resource set, including generating a reference signal time difference (RSTD) measurement by estimating a timing of a first arrival path from at least two of the plurality of DL PRS resources and determining a reference signal received power (RSRP) metric or a signal to noise and interference ratio (SINR) metric associated with the at least two DL PRS resources. The performed position measurements may be reported.

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