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    Secure long training field (LTF) transmit window signaling
    41.
    发明授权
    Secure long training field (LTF) transmit window signaling 有权

    公开(公告)号：US11431539B2

    公开(公告)日：2022-08-30

    申请号：US17145641

    申请日：2021-01-11

    Applicant: QUALCOMM Incorporated

    Inventor： Alireza Raissinia ,  Bin Tian ,  Stephen Jay Shellhammer ,  Youhan Kim

    IPC: H04L27/26 ,  H04W84/12 ,  H04L69/323

    Abstract: This disclosure provides methods, devices and systems for improving the security of secure long training field (LTF) transmissions. In some implementations, a transmitting device may perform windowing on a secure LTF, in the frequency domain, so that the resulting time-domain LTF signal is difficult, if not impossible, to predict by any device that observes a portion of the LTF signal. In some aspects, the transmitting device may negotiate the windowing of secure LTFs with a receiving device based on fine timing measurement (FTM) negotiation frames exchanged at the start of an FTM procedure. In some other aspects, the transmitting device may dynamically or adaptively perform windowing on secure LTFs. In such aspects, the transmitting device may indicate whether windowing is performed on a secure LTF based on information carried in a signal field of a physical layer convergence protocol (PLCP) protocol data unit (PPDU) that includes the secure LTF.

    Protection of ranging sounding signals from physical level attacks
    42.
    发明授权
    Protection of ranging sounding signals from physical level attacks 有权

    公开(公告)号：US10277425B2

    公开(公告)日：2019-04-30

    申请号：US16152998

    申请日：2018-10-05

    Applicant: QUALCOMM Incorporated

    Inventor： Erik David Lindskog ,  Ning Zhang ,  Naveen Kumar Kakani ,  Alireza Raissinia ,  Xiaoxin Zhang

    IPC: H04L25/02 ,  H04L29/06 ,  H04W12/12 ,  H04W84/12

    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
    43.
    发明授权
    Protection of ranging sounding signals from physical level attacks 有权

    公开(公告)号：US10135638B2

    公开(公告)日：2018-11-20

    申请号：US15943243

    申请日：2018-04-02

    Applicant: QUALCOMM Incorporated

    Inventor： Erik David Lindskog ,  Ning Zhang ,  Naveen Kumar Kakani ,  Alireza Raissinia ,  Xiaoxin Zhang

    IPC: H04W84/12 ,  H04L25/02

    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.

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