RANGING PROTOCOL IMPROVEMENTS TO SUPPORT ANTENNA SWITCHING

    公开(公告)号:US20190305813A1

    公开(公告)日:2019-10-03

    申请号:US16297425

    申请日:2019-03-08

    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.

    PROTECTION OF RANGING SOUNDING FROM PREFIX REPLAY ATTACKS

    公开(公告)号:US20190036739A1

    公开(公告)日:2019-01-31

    申请号:US16046599

    申请日:2018-07-26

    Abstract: Methods, systems, and devices for wireless communication are described. A ranging message procedure may employ protection by modifying a cyclic prefix of the ranging message to prevent an attacking device from transmitting a time-advanced copy of the cyclic prefix during symbol of the copied signal. For example, the modified cyclic prefix may include pseudo random training sequences or a set of zero-value symbols. The receiving device may determine a channel estimation technique that accounts for the modified cyclic prefix. The wireless devices performing the ranging measurement process may determine a modulation and coding scheme (MCS) for the ranging message. The wireless devices may negotiate an MCS value and cyclic prefix configuration for the ranging measurement process. In some examples, the ranging message be encoded by applying a sequence of phase rotations or amplitude variations to the base sequence used to generate the sounding training signal.

    Ranging protocol improvements to support antenna switching

    公开(公告)号:US11381275B2

    公开(公告)日:2022-07-05

    申请号:US16297425

    申请日:2019-03-08

    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.

    Protection of ranging sounding signals from physical level attacks

    公开(公告)号:US10277425B2

    公开(公告)日:2019-04-30

    申请号:US16152998

    申请日:2018-10-05

    Abstract: Generally, the described techniques provide for protection mechanisms for sounding training signals transmitted between wireless devices when performing ranging sounding estimation. For example, sounding training signals may be encoded to include a sequence of phase rotations or cyclic shifts to protect the sounding training signal from peer devices. In some cases, encoding information associated with a long training field (LTF) may be transmitted either before or after the LTF is transmitted. Additionally or alternatively, a time delay may be introduced to the sounding training signal, where timing information may be removed from one or more fields of the sounding training signal and the time delay may be appended to an interframe spacing. Alternatively, a frame may be split into multiple frames with the sounding training signal in a first frame, and timing information in a second frame that is offset in time from the first frame.

    Protection of ranging sounding signals from physical level attacks

    公开(公告)号:US10135638B2

    公开(公告)日:2018-11-20

    申请号:US15943243

    申请日:2018-04-02

    Abstract: Generally, the described techniques provide for protection mechanisms for sounding training signals transmitted between wireless devices when performing ranging sounding estimation. For example, sounding training signals may be encoded to include a sequence of phase rotations or cyclic shifts to protect the sounding training signal from peer devices. In some cases, encoding information associated with a long training field (LTF) may be transmitted either before or after the LTF is transmitted. Additionally or alternatively, a time delay may be introduced to the sounding training signal, where timing information may be removed from one or more fields of the sounding training signal and the time delay may be appended to an interframe spacing. Alternatively, a frame may be split into multiple frames with the sounding training signal in a first frame, and timing information in a second frame that is offset in time from the first frame.

    PROTECTION OF RANGING SOUNDING SIGNALS FROM PHYSICAL LEVEL ATTACKS

    公开(公告)号:US20180287826A1

    公开(公告)日:2018-10-04

    申请号:US15943243

    申请日:2018-04-02

    Abstract: Generally, the described techniques provide for protection mechanisms for sounding training signals transmitted between wireless devices when performing ranging sounding estimation. For example, sounding training signals may be encoded to include a sequence of phase rotations or cyclic shifts to protect the sounding training signal from peer devices. In some cases, encoding information associated with a long training field (LTF) may be transmitted either before or after the LTF is transmitted. Additionally or alternatively, a time delay may be introduced to the sounding training signal, where timing information may be removed from one or more fields of the sounding training signal and the time delay may be appended to an interframe spacing. Alternatively, a frame may be split into multiple frames with the sounding training signal in a first frame, and timing information in a second frame that is offset in time from the first frame.

    ACCESS POINT (AP) TO ACCESS POINT (AP) RANGING FOR PASSIVE LOCATIONING

    公开(公告)号:US20190306825A1

    公开(公告)日:2019-10-03

    申请号:US16277353

    申请日:2019-02-15

    Abstract: This disclosure provides systems, methods and apparatuses, including computer programs encoded on computer storage media, for performing a ranging operation with a responder device. In one aspect, an apparatus exchanges a number of measurement frames with the responder device. The apparatus captures a number of timestamps based on the exchanged measurement frames. The apparatus estimates a carrier frequency offset between the responder device and the apparatus, and reports information indicative of the captured timestamps to the responder device.

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