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Wireless device ranging

A technology of equipment detection and equipment, applied in radio wave measurement system, wireless communication, radio wave reflection/re-radiation, etc., can solve problems such as system unreliability

Inactive Publication Date: 2018-01-26
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these systems can be quite unreliable in indoor environments

Method used

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Experimental program
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Embodiment Construction

[0053] Embodiments of the invention may allow ranging and positioning of multiple devices in a network. This is based on time-of-flight (ToF) measurement frames transmitted by devices within the network. The accuracy of the ToF value can be improved by determining the relative clock drift value between the two devices so that timing errors caused by clock drift can be eliminated. ToF values ​​between devices are available from a single broadcast measurement frame.

[0054] A single measurement frame transmitted by each device participating in ranging may contain multiple symbols for time stamping in ToF measurements. These symbols may be of a type known as pilots and specified in the IEEE 802.11 standard. This configuration reduces measurement overhead in networks especially for dense deployments. Each transmission device time-stamps at least one measurement symbol within the frame and encapsulates one or more time-stamps in the measurement frame.

[0055] A device partici...

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Abstract

A method and apparatus for detecting, by a first device, a timing measurement frame from a second device (702), the timing measurement frame having a plurality of time measurement samples, wherein atleast the first of the measurement samples has a transmit timestamp value; determining transmit timing values for the subsequent measurement samples; applying a receive timestamp value to each of thereceived measurement samples; and determining a relative clock drift (704) between a clock of the first device and a clock of the second device by comparing the receive timestamp values with transmittiming values of one or more measurement samples contained in the frame.

Description

technical field [0001] The present invention relates to ranging or positioning of wireless devices. Background technique [0002] In recent years, people have used mobile devices to determine their current location. Location determination of a device is useful in various scenarios. For example, determining device location is useful when using a map application for navigation. Additional examples include accessing location-based services, such as customized information related to the Yellow Pages service, or conducting research in the context of the current device location. Location services are increasingly useful for social networking these days. [0003] Satellite navigation systems such as the Global Positioning System (GPS) or GLONASS (Global Positioning System Satellite) are useful for tracking the location of a device. However, these systems can be rather unreliable in indoor environments. Contents of the invention [0004] A first aspect of the invention provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00G01S11/02G01S5/14G01S13/74H04W64/00H04L27/26
CPCG01S5/14G01S11/02G01S13/74H04L27/2662H04L27/2675H04L27/2692H04W56/0055H04L27/26H04W56/00G01S11/08
Inventor E·兰塔拉I·泰卡里J·耐克特M·卡斯林J·马林O·阿拉宁
Owner NOKIA TECHNOLOGLES OY