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    ACCESS POINT (AP) TO ACCESS POINT (AP) RANGING FOR PASSIVE LOCATIONING
    1.
    发明申请
    ACCESS POINT (AP) TO ACCESS POINT (AP) RANGING FOR PASSIVE LOCATIONING 审中-公开

    公开(公告)号：WO2018156862A1

    公开(公告)日：2018-08-30

    申请号：PCT/US2018/019366

    申请日：2018-02-23

    Applicant: QUALCOMM INCORPORATED

    Inventor： LINDSKOG, Erik David ,  KAKANI, Naveen Kumar ,  RAISSINIA, Alireza

    IPC: G01S5/02 ,  G01S13/82 ,  G01S13/87 ,  H04W64/00 ,  H04W84/12

    Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for performing ranging operations. In one aspect, an apparatus negotiates a passive ranging schedule between an initiator device and a number of responder devices. The passive ranging schedule indicates a time prior to a selected target beacon transmission time (TBTT) at which the ranging operation is to commence. The apparatus announces the passive ranging schedule to at least one or more passive listening devices, commences the ranging operation at the indicated time by exchanging a number of frames between the initiator device and the number of responder devices, and completes the exchange of frames prior to the selected TBTT.

    RANGING PROTOCOL IMPROVEMENTS TO SUPPORT ANTENNA SWITCHING
    2.
    发明申请
    RANGING PROTOCOL IMPROVEMENTS TO SUPPORT ANTENNA SWITCHING 审中-公开

    公开(公告)号：WO2019190733A1

    公开(公告)日：2019-10-03

    申请号：PCT/US2019/021667

    申请日：2019-03-11

    Applicant: QUALCOMM INCORPORATED

    Inventor： ZHANG, Xiaoxin ,  LINDSKOG, Erik David ,  RAVI, Sunil ,  LANDENBERGER, Kurt Erwin ,  SHARMA, Mukul ,  BHATIA, Arjun

    IPC: H04W64/00

    Abstract: This disclosure provides systems, methods and apparatuses, including computer programs encoded on computer storage media, for ranging procedures performed using antenna switching. In one aspect, a device initiating a ranging procedure may transmit a ranging request, which may include antenna switching capabilities of the initiating device, a request for antenna switching by a responding device during the ranging procedure, or both. Ranging signaling may be communicated between the initiating device and the responding device using different transmit antennas, receive antennas, or both. In some implementations, ranging messages transmitted by the responding device may include transmit antenna indices used for transmission of different ranging messages, and receive antenna indices used for reception of different ranging response messages. The initiating device may estimate a range relative to the responding device based on round trip times (RTTs) associated with different antenna pairs used during the ranging procedure.

    RANGE MEASUREMENT WITH CLOSED-LOOP FEEDBACK ON RTT QUALITY
    3.
    发明申请
    RANGE MEASUREMENT WITH CLOSED-LOOP FEEDBACK ON RTT QUALITY 审中-公开

    公开(公告)号：WO2019217688A1

    公开(公告)日：2019-11-14

    申请号：PCT/US2019/031532

    申请日：2019-05-09

    Applicant: QUALCOMM INCORPORATED

    Inventor： ZHANG, Xiaoxin ,  HOMCHAUDHURI, Sandip ,  LINDSKOG, Erik David ,  JONES, IV, Vincent Knowles ,  DAVIDSON, Andrew MacKinnon

    IPC: H04W56/00 ,  H04W84/12

    Abstract: An apparatus is disclosed according to certain aspects of the present disclosure. The apparatus comprises an interface configured to receive, from a wireless node, at least one ranging frame. The apparatus also comprises a processing system configured to determine at least one round trip time (RTT) between the apparatus and the wireless node based on the received at least one ranging frame, determine a quality of the at least one RTT based on the received at least one ranging frame, and generate a feedback frame comprising the at least one RTT and the quality of the at least one RTT. The interface is further configured to output a feedback frame for transmission to the wireless node.

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