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    Random access preamble transmission timing offset
    15.
    发明授权
    Random access preamble transmission timing offset 有权

    公开(公告)号：US11659599B2

    公开(公告)日：2023-05-23

    申请号：US17240708

    申请日：2021-04-26

    申请人： QUALCOMM Incorporated

    发明人： Jun Ma ,  Qiang Wu ,  Dan Zhang ,  Alberto Rico Alvarino ,  Xiao Feng Wang ,  Liangping Ma ,  Peter Gaal ,  Iyab Issam Sakhnini

    IPC分类号： H04J3/00 ,  H04W74/08 ,  H04W72/0446

    CPC分类号： H04W74/0833 ,  H04W72/0446

    摘要： Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may account for propagation delay when initiating a random access (RACH) procedure. For example, the UE may determine transmission timing for a RACH preamble based on an estimated propagation delay, such that the RACH preamble is received at a base station approximately at the beginning of a slot. To support reliable communication of the RACH preamble, the UE may implement a timing offset. In some examples, the base station may configure the UE with the timing offset using system information. Alternatively, the UE may be pre-configured with the timing offset. By determining the transmission timing for the RACH preamble further based on the timing offset, the UE may ensure that the RACH preamble is received at the base station after a slot boundary (e.g., avoiding causing interference to communications in a previous slot).

    ANGULAR RELATIONSHIP DETERMINATION USING FOCAL POINT PERTURBATION
    17.
    发明申请
    ANGULAR RELATIONSHIP DETERMINATION USING FOCAL POINT PERTURBATION 有权

    公开(公告)号：US20230089054A1

    公开(公告)日：2023-03-23

    申请号：US17480598

    申请日：2021-09-21

    申请人： QUALCOMM Incorporated

    发明人： Mehmet Izzet GURELLI ,  Qiang Wu ,  Junyi LI ,  Navid ABEDINI ,  Tao LUO ,  Ozge KOYMEN

    IPC分类号： G01S5/02

    摘要： An angular relationship determination method includes: obtaining, at an apparatus, a first phase difference indication corresponding to a first difference in phase between a first signal wirelessly received by a wireless signaling device from a transmitter and a second signal wirelessly received by the wireless signaling device from the transmitter; and determining, at the apparatus, a first angular relationship between the transmitter and the wireless signaling device based on the first phase difference indication, a first virtual focal point location corresponding to the first signal, and a second virtual focal point location corresponding to the second signal, the second virtual focal point location and the first virtual focal point location being different.

    TWO-ROOT PREAMBLE DESIGN FOR DELAY AND FREQUENCY SHIFT
    20.
    发明申请
    TWO-ROOT PREAMBLE DESIGN FOR DELAY AND FREQUENCY SHIFT 有权

    公开(公告)号：US20210051730A1

    公开(公告)日：2021-02-18

    申请号：US16992678

    申请日：2020-08-13

    申请人： QUALCOMM Incorporated

    发明人： Dan Zhang ,  Xiao Feng Wang ,  Peter Gaal ,  Jun Ma ,  Qiang Wu ,  Iyab Issam Sakhnini ,  Huilin Xu

    IPC分类号： H04W74/08 ,  H04L5/00 ,  H04L27/00

    摘要： Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a base station by initiating a random access procedure with a two-root preamble. The UE may receive, from the base station, control signaling that indicates a set of root preamble sequences. The UE may transmit, to the base station, a preamble signal that is generated based on a first root preamble sequence and a second root preamble sequence of the set of root preamble sequences. The UE may then monitor for a preamble response based on the preamble signal. In some cases, the base station may be a base station in a terrestrial network. In other cases, the base station may be a satellite in a non-terrestrial network (NTN).