公开(公告)号：US20200088837A1

公开(公告)日：2020-03-19

申请号：US16691752

申请日：2019-11-22

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Dongho KIM ,  Souvik SEN

IPC: G01S5/14 ,  H04W64/00 ,  G01S5/04 ,  G01S5/02

Abstract: A method of determining the location of a mobile computing device includes measuring a first time of flight (ToF) value and a first value of received energy of direct path (EDP) (PR) of a number of acknowledgement (ACK) packets received in response to a number of first probe packets sent to a first mobile device. The method calculates a preliminary distance value (d0) using a ToF-based distance equation, selects an ACK packet with a distance closest to d0 from the number of ACK packets, calculates an initial path loss exponent (γ0) of the selected ACK packet sample using d0 and PR. With the access point, the method also includes measuring a second PR for a second number of ACK packets received in response to a number of second probe packets sent to the first mobile device, calculates a supplemental distance value using an EDP-based distance equation and the γ0, and determines the location of the mobile device using multilateration and the supplemental distance value.

公开(公告)号：US20170223657A1

公开(公告)日：2017-08-03

申请号：US15500617

申请日：2014-11-24

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Souvik SEN ,  Dongho KIM

IPC: H04W64/00 ,  G01S13/76 ,  G01S13/87 ,  G01S5/14

CPC classification number: H04W64/003 ,  G01S5/14 ,  G01S13/767 ,  G01S13/878 ,  H04W64/00 ,  H04W84/12

Abstract: Described herein are techniques for determining a location of a disconnected device. In an example, a method includes instructing a first access point to sniff a wireless channel for probe request packets from disconnected devices, and instructing the first access point to send a distance-probing packet to a disconnected device after receiving a probe request packet from the disconnected device. The method further includes receiving, from the first access point, a MAC address of the disconnected device determined from the received probe request packet. After receiving the MAC address from the first access point, a group of access points is instructed to send distance-probing packets to the disconnected device. The method further includes receiving, from the first access point and the group of access points, time-of-flight measurements associated with the disconnected device. A location of the disconnected device can be determined using the time-of-flight measurements.

公开(公告)号：US20170013402A1

公开(公告)日：2017-01-12

申请号：US15114875

申请日：2014-01-31

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Souvik SEN ,  Jung Gun LEE ,  Alexander Timothy MARIAKAKIS

IPC: H04W4/02 ,  G01S5/10 ,  G01S5/02

CPC classification number: H04W4/023 ,  G01S5/0263 ,  G01S5/0273 ,  G01S5/0294 ,  G01S5/10 ,  H04W4/027 ,  H04W64/00

Abstract: Localizing a location of a mobile device may be performed by obtaining times of flights between the mobile device and an access point at a first and second location. A heading of the mobile device and a distance between the first and second location may be further obtained. The times of flight, heading, and distance may be used to localize the second location.

Abstract translation: 可以通过获取在第一和第二位置处的移动设备和接入点之间的航班的时间来执行移动设备的位置的本地化。 可以进一步获得移动设备的航向和第一和第二位置之间的距离。 飞行时间，航向和距离可用于本地化第二个位置。

公开(公告)号：US20220322047A1

公开(公告)日：2022-10-06

申请号：US17222414

申请日：2021-04-05

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Jeongkeun LEE ,  Souvik SEN ,  Stephane LAROCHE

IPC: H04W4/06 ,  H04W28/02

Abstract: An example system includes a transceiver. The transceiver communicates multicast frames to a plurality of client devices in a multicast group. The system further includes a controller. The controller determines that a predetermined time has passed since the transceiver most recently sent a unicast transmission to one of the plurality of client devices. The controller instructs the transceiver to transmit a unicast frame to the one of the plurality of client devices. The controller computes a data rate for the one of the plurality of client devices based on the transmission of the unicast frame to the one of the plurality of client devices.

公开(公告)号：US20160191215A1

公开(公告)日：2016-06-30

申请号：US14912070

申请日：2013-08-14

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Jung Gun LEE ,  Souvik SEN ,  Raul ETKIN

IPC: H04L5/00 ,  H04B7/04 ,  H04B7/06

CPC classification number: H04L5/001 ,  H04B7/0413 ,  H04B7/0626 ,  H04B7/0691 ,  H04L5/006

Abstract: A set of antennas is selected from a plurality of antennas for transmitting data streams on a plurality of subcarriers based on channel state information of a communications channel between the plurality of antennas and a plurality of receive antennas at a client device, a number of the data streams to be transmitted, and a channel coherence time of the communications channel. A size of the set is equal to or greater than the number of data streams.

Abstract translation: 从多个天线中选择一组天线，用于基于多个天线之间的通信信道和客户端设备的多个接收天线的信道状态信息在多个子载波上发送数据流，数据的数量 要发送的流，以及通信信道的信道相干时间。 集合的大小等于或大于数据流的数量。