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Determining Distances Between Wireless Devices

a wireless device and distance measurement technology, applied in data switching networks, frequency-division multiplexes, instruments, etc., can solve the problem of old problems in determining the location of wireless devices

Inactive Publication Date: 2013-10-03
HEWLETT-PACKARD ENTERPRISE DEV LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This method provides more accurate distance estimation and device location determination, independent of signal strength or effective radiated power, by analyzing the failure rates of frame reception across multiple locating devices.

Problems solved by technology

Determining the location of a wireless device is an old problem.

Method used

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  • Determining Distances Between Wireless Devices
  • Determining Distances Between Wireless Devices

Examples

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Embodiment Construction

[0010]Embodiments of the invention relate to methods of estimating the location of a wireless device operating in the range of a wireless digital network.

[0011]According to the present invention, a locating device (LD) attached to a network transmits frames to a device to be located (DTL) and receives an Acknowledgement (ACK) response when the frame has been received by the DTL without error. The LD varies transmission parameters of the frames transmitted to the DTL, looking for a change in the failure rate of the ACKs received from the DTL. Transmission parameters varied by the LD include transmit power, attenuation and transmit data rate. The LD searches this transmission parameter space looking for the critical level where the DTL goes from not being able to receive the frame to being able to successfully receive and acknowledge the frame. Since the signal level at the DTL to successfully decode a frame with a given set of parameters is known, and the transmit path and therefore ...

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PUM

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Abstract

A method includes transmitting frames from a first device to a second device, where a first frame is transmitted at a first value for a particular transmission parameter, and where a second frame is transmitted at a second value for the particular transmission parameter that is different than the first value. For each of the transmitted frames, a determination is made if a corresponding Acknowledgement (ACK) frame, as defined by IEEE 802.11 standards, is received by the first device from the second device. Based on the IEEE 802.11 ACK frames received by the first device from the second device, a distance estimate is calculated from the first device to the second device.

Description

RELATED APPLICATIONS, PRIORITY CLAIM, AND DISCLAIMER[0001]This application is a Continuation of application Ser. No. 12 / 947,579 filed on Nov. 16, 2010 which is incorporated by reference in its entirety. The applicant(s) hereby rescind any disclaimer of claim scope in the parent application(s) or the prosecution history thereof and advice the USPTO that the claims in this application may be broader than any claim in the parent application(s).BACKGROUND OF THE INVENTION[0002]The present invention relates to wireless digital networks, and in particular, to the problem of locating a wireless device.[0003]Determining the location of a wireless device is an old problem. Typical solutions rely on a number (greater than two) of locating devices (LD) at known locations. Each LD makes a measurement of some characteristic of a signal from the device to be located (DTL), where the measurement correlates to a distance estimate between the DT and the LD. Using distance estimates and locations fro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W24/00
CPCG01S5/00H04W24/00G01S11/06G01S5/14
Inventor PONNUSWAMY, SUBBURAJAN
Owner HEWLETT-PACKARD ENTERPRISE DEV LP
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