公开(公告)号：US12167272B2

公开(公告)日：2024-12-10

申请号：US17471394

申请日：2021-09-10

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Parthiban Ellappan

IPC: H04W28/02 ,  H04L43/0852 ,  H04W24/08 ,  H04W56/00

Abstract: Techniques are provided for reducing signaling latency in multi-link devices (MLDs). An example method of providing latency sensitive information with a MLD includes receiving downlink data packets from a station via a first radio link, performing radio frequency sensing with a second radio link, detecting a latency sensitive event, and transmitting an indication of the latency sensitive event.

公开(公告)号：US12140664B2

公开(公告)日：2024-11-12

申请号：US17191463

申请日：2021-03-03

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Parthiban Ellappan

IPC: G01S13/90 ,  G01S13/06 ,  G01S13/86 ,  G06F21/32

Abstract: Disclosed are systems and techniques for detecting user presence, user motion, and for performing facial authentication. For instance, a wireless device can receive a waveform that is a reflection of a transmitted radio frequency (RF) waveform. Based on RF sensing data associated with the received waveform, the wireless device can determine a presence of a user. In response to determining the presence of the user, the wireless device can initiate facial authentication of the user.

公开(公告)号：US11736898B2

公开(公告)日：2023-08-22

申请号：US17403517

申请日：2021-08-16

Applicant: QUALCOMM Incorporated

Inventor： Devesh Singh ,  Xiaoxin Zhang

IPC: H04W4/02

CPC classification number: H04W4/027

Abstract: In an aspect, a wireless device receives one or more sensing sets. Each sensing set has one or more sensing packets. The wireless device determines one or more motion detection metrics. Each motion detection metric is based on phase differences between tones of the one or more sensing packets for each of the one or more sensing sets. The wireless device determines one or more detected motion magnitudes based on a comparison of each motion detection metric for each of the one or more sensing sets and a baseline metric. The wireless device detects a motion based on at least a portion of the one or more detected motion magnitudes exceeding a first motion threshold.

公开(公告)号：US10379196B2

公开(公告)日：2019-08-13

申请号：US15191498

申请日：2016-06-23

Applicant: QUALCOMM Incorporated

Inventor： Carlos Horacio Aldana ,  Jeff Smith ,  Xiaoxin Zhang ,  Chia-Hui Lin ,  Yen-Feng Lee ,  Ravi Gidvani ,  Alecsander Eitan ,  Rahul Malik

IPC: G01S5/00 ,  H04W4/02 ,  G01S5/02 ,  H04W24/10 ,  H04W88/02 ,  H04W84/12

Abstract: Disclosed embodiments facilitate wireless channel calibration, ranging, and direction finding, between networked devices. A method on a first station (STA) may comprise: broadcasting, at a first time, a first NDPA frame to a plurality of second STAs. The first NDPA frame may include a first bit indicating that one or more subsequent frames comprise ranging or angular information. After a Short Interval Frame Space (SIFS) time interval from the first time, a second frame may be broadcast. The second frame may be a Null Data Packet (NDP) frame. In response, a plurality of Compressed Beamforming (CBF) frames may be received at the first STA where each CBF frame may be received from a distinct corresponding second STA, and may include Channel Feedback Information field with information pertaining to communication channel between the first STA and the corresponding second STA. The communications may be encoded using Orthogonal Frequency Division Multiple Access.

公开(公告)号：US10200097B2

公开(公告)日：2019-02-05

申请号：US15470500

申请日：2017-03-27

Applicant: QUALCOMM Incorporated

Inventor： Beomsup Kim ,  Ning Zhang ,  Xiaoxin Zhang ,  Youhan Kim

IPC: H04B7/06 ,  H04B7/0456 ,  H04B17/327 ,  H04B7/08 ,  H04L25/02 ,  H04W84/12 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communication are described. An access point (AP) may switch antenna array configurations during reception of a packet to determine channel characteristic information for the antenna array configurations. The AP may use the channel characteristic information to select an antenna array configuration for use, and to determine a beamforming steering matrix for the selected antenna array configuration. In some cases, the AP may use multiple antenna array configurations to transmit training fields in the preamble of a packet. The AP may receive channel characteristic information for each of the antenna array configurations. The AP may use the channel characteristic information to select an antenna array configuration for use, and to determine a beamforming steering matrix for the selected antenna array configuration.

公开(公告)号：US10171151B1

公开(公告)日：2019-01-01

申请号：US15640184

申请日：2017-06-30

Applicant: QUALCOMM Incorporated

Inventor： Madhan Jaganathan ,  Xiaoxin Zhang ,  Ahmed Ragab Elsherif

IPC: H04B1/59 ,  H04B7/06 ,  H04B7/0417 ,  H04B7/0456 ,  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.

公开(公告)号：US20180287826A1

公开(公告)日：2018-10-04

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: H04L25/02

CPC classification number: H04L25/0226 ,  H04L25/0204 ,  H04L63/14 ,  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.

公开(公告)号：US20170280439A1

公开(公告)日：2017-09-28

申请号：US15466167

申请日：2017-03-22

Applicant: QUALCOMM Incorporated

Inventor： Ning ZHANG ,  Xiaoxin Zhang ,  Kai Shi

IPC: H04W72/04 ,  H04W24/02 ,  H04L5/00

CPC classification number: H04W72/0413 ,  H04L5/0007 ,  H04L5/0055 ,  H04L25/0216 ,  H04L27/2607 ,  H04W24/02

Abstract: This disclosure provides systems, methods and apparatuses for selecting a guard interval for transmission of orthogonal frequency-division multiplexing (OFDM) symbols on an uplink (UL) channel and on a downlink (DL) channel. In some implementations, a transmitting device and a receiving device can estimate channel delay spread (CDS) information for each other's transmit channels, exchange the estimated CDS information with each other, and select a guard interval based on the estimated CDS information exchanged with each other. The transmitting device can transmit a number of OFDM symbols separated by the selected guard interval to the receiving device on the UL channel, and the receiving device can transmit a number of OFDM symbols separated by the selected guard interval to the transmitting device on the DL channel.

公开(公告)号：US20170279507A1

公开(公告)日：2017-09-28

申请号：US15470500

申请日：2017-03-27

Applicant: QUALCOMM Incorporated

Inventor： Beomsup Kim ,  Ning Zhang ,  Xiaoxin Zhang ,  Youhan Kim

IPC: H04B7/0456 ,  H04L25/02 ,  H04B17/327 ,  H04B7/06 ,  H04B7/08

CPC classification number: H04B7/0456 ,  H04B7/0617 ,  H04B7/0691 ,  H04B7/0865 ,  H04B7/0874 ,  H04B17/327 ,  H04L25/0202 ,  H04W84/12 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communication are described. An access point (AP) may switch antenna array configurations during reception of a packet to determine channel characteristic information for the antenna array configurations. The AP may use the channel characteristic information to select an antenna array configuration for use, and to determine a beamforming steering matrix for the selected antenna array configuration. In some cases, the AP may use multiple antenna array configurations to transmit training fields in the preamble of a packet. The AP may receive channel characteristic information for each of the antenna array configurations. The AP may use the channel characteristic information to select an antenna array configuration for use, and to determine a beamforming steering matrix for the selected antenna array configuration.

公开(公告)号：US20170250831A1

公开(公告)日：2017-08-31

申请号：US15191493

申请日：2016-06-23

Applicant: QUALCOMM Incorporated

Inventor： Carlos Horacio Aldana ,  Jeff Smith ,  Xiaoxin Zhang ,  Chia-Hui Lin ,  Yen-Feng Lee ,  Ravi Gidvani ,  Alecsander Eitan ,  Rahul Malik

IPC: H04L12/18 ,  H04W24/10 ,  H04L12/841

CPC classification number: G01S5/0009 ,  G01S5/021 ,  G01S5/0226 ,  H04W4/02 ,  H04W4/029 ,  H04W24/10 ,  H04W84/12 ,  H04W88/02

Abstract: Disclosed embodiments facilitate wireless channel calibration, including ranging and direction finding, between wirelessly networked devices. In some embodiments. a method on a first station (STA) may comprise: transmitting a first NDPA frame to one or more second stations (STAs), the first NDPA frame comprising a first bit indicating that one or more subsequent frames comprise ranging or angular information; and transmitting, after a Short Interval Frame Space (SIFS) time interval, a second frame. The second frame may be one of: a Null Data Packet az (NDP_az) frame with information about a time of transmission of the NDP_az frame, or a Null Data Packet (NDP) frame, or a Beam Refinement Protocol (BRP) frame. The first NDPA frame may be unicast, multicast, or broadcast.