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公开(公告)号：US20190036739A1
公开(公告)日：2019-01-31
申请号：US16046599
申请日：2018-07-26
Applicant: QUALCOMM Incorporated
Inventor： Erik David Lindskog , Ning Zhang , Xiaoxin Zhang , Alireza Raissinia , Naveen Kumar Kakani
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.
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公开(公告)号：US20190007114A1
公开(公告)日：2019-01-03
申请号：US15640184
申请日：2017-06-30
Applicant: QUALCOMM Incorporated
Inventor： Madhan Jaganathan , Xiaoxin Zhang , Ahmed Ragab Elsherif
IPC: H04B7/06 , H04B7/0417 , H04B7/04 , H04B1/59 , H04L27/26
Abstract: This disclosure provides systems, methods and apparatus for wireless communication. In one aspect, a method of wireless communication includes utilizing a sounding procedure to obtain compressed beamforming (CBF) information. The sounding procedure may be a single-user or multi-user sounding procedure. The CBF information may contain various information regarding a particular channel that an access point may use for transmission. The information may include per-tone SNR information which may be processed to determine characteristics of the channel. Various techniques may be utilized to determine the further characteristics of the channel. The determined characteristics of the channel may then be used to determine an appropriate guard interval (GI) between symbols that are to be transmitted. Appropriate GI selection in wireless communications may facilitate higher throughput while decreasing overhead due to unnecessary idle time.
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公开(公告)号：US20180332489A1
公开(公告)日：2018-11-15
申请号：US16045528
申请日：2018-07-25
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Xiaoxin Zhang
CPC classification number: H04W24/06 , G01S5/12 , G01S13/74 , H04L1/16 , H04L43/0864 , H04W72/0406 , H04W72/0446
Abstract: Apparatuses and methods are disclosed for performing ranging operations between an initiator device and a responder device. The initiator device may transmit, to the responder device, a fine timing measurement (FTM) request frame including a request to estimate angle information for a number of frames exchanged between the initiator device and the responder device and indicating a level of accuracy for the estimated angle information. The initiator device may receive a first FTM frame from the responder device, and may transmit an acknowledgement (ACK) frame to the responder device. The initiator device may receive, from the responder device, a second FTM frame including angle information of the first FTM frame and timing information of one or more of the exchanged frames.
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公开(公告)号：US10129120B2
公开(公告)日：2018-11-13
申请号：US15625671
申请日：2017-06-16
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Sandip Homchaudhuri , Xin He , Xiaoxin Zhang , Ashish Kumar Shukla
Abstract: Disclosed are systems, methods and devices for obtaining round trip time measurements for use in location based services. In particular implementations, a fine timing measurement request message wirelessly transmitted by a first transceiver device to a second transceiver device may permit additional processing features in computing or applying a signal round trip time measurement. Such a signal round trip time measurement may be used in positioning operations.
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公开(公告)号：US09973949B2
公开(公告)日：2018-05-15
申请号：US15013374
申请日：2016-02-02
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Xiaoxin Zhang
CPC classification number: H04W24/06 , G01S5/12 , G01S13/74 , H04L1/16 , H04L43/0864 , H04W72/0406 , H04W72/0446
Abstract: Apparatuses and methods are disclosed that may perform ranging operations between an initiator device and a responder device. The initiator device may request the responder device to perform a ranging operation. The responder device may transmit a first fine timing measurement (FTM) frame to the initiator device, may receive an acknowledgement (ACK) frame from the responder device, and may transmit a second FTM frame to the initiator device. The second FTM frame may include a time value and angle information. The time value may indicate a difference between a time of departure (TOD) of the first FTM frame and a time of arrival (TOA) of the ACK frame. The angle information may indicate a direction of the initiator device relative to the responder device. The initiator device may determine its position, relative to the responder device, based at least in part on the received time value and angle information.
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Patent Agency Ranking
公开(公告)号：US09923792B2
公开(公告)日：2018-03-20
申请号：US15281412
申请日：2016-09-30
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Sandip Homchaudhuri , Xin He , Xiaoxin Zhang , Ashish Kumar Shukla
IPC: H04L12/26 , H04B7/216 , H04W64/00 , G01S5/00 , G01S13/76 , H04W24/00 , H04W4/04 , H04L5/00 , H04W76/02 , H04W72/08
CPC classification number: H04L43/0864 , G01S5/00 , G01S13/767 , H04L5/005 , H04W4/043 , H04W4/30 , H04W24/00 , H04W64/00 , H04W72/082 , H04W76/10
Abstract: Disclosed are systems, methods and devices for obtaining round trip time measurements for use in location based services. In particular implementations, a fine timing measurement request message wirelessly transmitted by a first transceiver device to a second transceiver device may permit additional processing features in computing or applying a signal round trip time measurement. Such a signal round trip time measurement may be used in positioning operations.
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公开(公告)号：US09907044B2
公开(公告)日：2018-02-27
申请号：US14837775
申请日：2015-08-27
Applicant: QUALCOMM Incorporated
Inventor： Xiaoxin Zhang , Ning Zhang , Carlos Horacio Aldana , Youhan Kim , Praveen Dua , Meghna Agrawal
CPC classification number: H04W64/00 , H04L5/0055 , H04L47/283 , H04W24/00 , H04W52/0209 , H04W84/12 , Y02D70/00 , Y02D70/1222 , Y02D70/1262 , Y02D70/142 , Y02D70/144 , Y02D70/162 , Y02D70/22
Abstract: A ranging operation between a first wireless device and a second wireless may be performed by: sending, to the second wireless device, a data frame including a request for the second wireless device to report its actual SIFS duration to the first wireless device; determining a time of departure (TOD) of the data frame; receiving, from the second wireless device, a response frame including SIFS information indicative of the actual SIFS duration of the second wireless device; determining a time of arrival (TOA) of the response frame; and determining a round trip time (RTT) of the data frame and the response frame using the TOD of the data frame, the TOA of the response frame, and the actual SIFS duration of the second wireless device.
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公开(公告)号：US20180011179A1
公开(公告)日：2018-01-11
申请号：US15643188
申请日：2017-07-06
Applicant: QUALCOMM Incorporated
Inventor： Xiaoxin Zhang , Ning Zhang , Youhan Kim , Rahul Malik , James Cho
CPC classification number: G01S11/026 , H04B7/06 , H04L5/0048 , H04L27/2613 , H04L27/2646 , H04L27/2663 , H04L69/22 , H04W64/00 , H04W84/12
Abstract: This disclosure provides systems, methods and apparatuses for detecting a presence of long training fields (LTFs) in packet extensions of high-efficiency (HE) packets. An apparatus requests a length of packet extensions to be used for a ranging operation. The apparatus receives an HE packet including a packet extension containing a selected number of LTFs based at least in part on the requested packet extension length. The apparatus performs the ranging operation based on a determination that the packet extension contains LTFs. In some aspects, the apparatus detects a presence of LTFs in the packet extension based on a bit provided in the HE packet. In some other aspects, the apparatus detects a presence of LTFs in the packet extension by extracting sequences from the packet extension.
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公开(公告)号：US09867004B2
公开(公告)日：2018-01-09
申请号：US15080337
申请日：2016-03-24
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Ning Zhang , James Simon Cho , Xiaoxin Zhang
CPC classification number: H04W4/023 , G01S5/021 , G01S5/14 , G01S11/08 , G01S19/48 , H04L27/266 , H04W4/02 , H04W56/0015 , H04W56/0025
Abstract: Disclosed herein are techniques for range measurement between one or more wireless stations (STAs) and a first access point (AP). In various embodiments, the first AP may synchronize a clock of the first AP with clocks of one or more synchronized APs. The first AP may perform a synchronization session with the one or more STAs. The first AP may also transmit one or more Broadcast time-of-departure (TOD) frames to the one or more STAs. Each of the one or more Broadcast TOD frames may include a time of departure of a Broadcast TOD frame from the first AP. A second AP and a third AP of the one or more synchronized APs may also transmit one or more Broadcast TOD frames to the one or more STAs for range and/or position determination.
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公开(公告)号：US20170310570A1
公开(公告)日：2017-10-26
申请号：US15625671
申请日：2017-06-16
Applicant: QUALCOMM Incorporated
Inventor： Carlos Horacio Aldana , Sandip Homchaudhuri , Xin He , Xiaoxin Zhang , Ashish Kumar Shukla
CPC classification number: H04L43/0864 , G01S5/00 , G01S13/767 , H04L5/005 , H04W4/043 , H04W4/30 , H04W24/00 , H04W64/00 , H04W72/082 , H04W76/10
Abstract: Disclosed are systems, methods and devices for obtaining round trip time measurements for use in location based services. In particular implementations, a fine timing measurement request message wirelessly transmitted by a first transceiver device to a second transceiver device may permit additional processing features in computing or applying a signal round trip time measurement. Such a signal round trip time measurement may be used in positioning operations.
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