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A positioning method, related equipment and system based on time measurement

A technology of time measurement and positioning method, applied in the field of positioning, can solve problems such as unfavorable protection of STA location privacy

Active Publication Date: 2020-09-25
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This causes the location of the STA to be transparent to the AP or the positioning system side where the AP is located, which is not conducive to protecting the location privacy of the STA.

Method used

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  • A positioning method, related equipment and system based on time measurement
  • A positioning method, related equipment and system based on time measurement
  • A positioning method, related equipment and system based on time measurement

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Embodiment Construction

[0054] The terms used in the embodiments of the present invention are only used to explain specific examples of the present invention, and are not intended to limit the present invention.

[0055] First, the basic concept involved in the embodiment of the present invention is introduced: short interframe space (SIFS).

[0056] According to the standard IEEE 802.11, there must be a certain interval between consecutive frames, so that the device has time to do necessary processing after receiving a frame, such as sending and receiving conversion, physical layer processing and MAC layer processing, etc. For an interactive process, the interval between two adjacent frames is called SIFS. Specifically, SIFS refers to the time from the end of the last symbol of the previous frame to the start of the first symbol of the preamble sequence of the next frame.

[0057] According to the standard IEEE 802.11, the requester (such as STA) needs to verify the measurement frame after receivin...

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Abstract

The embodiment of the invention discloses a positioning method, device and system based on time measurement. The method includes: the requesting party performs time measurement with multiple responding parties respectively, and calculates the position of the requesting party according to the measurement results. Among them, the measurement results obtained by the time measurement between the requester and each responder include time tags t1, t2, t3 and t4, t1 is the time when the responder sends the measurement frame, t2 is the time when the requester receives the measurement frame, and t3 is the request t4 is the time when the responder sends the response frame to the measurement frame, and t4 is the time when the responder receives the response frame. Wherein, the response frame is sent by the requesting party after receiving the last symbol of the measurement frame and waiting for a randomly generated short inter-frame interval. The randomly generated short interframe interval is randomly generated within the specified fluctuation range of the standard short interframe interval. The foregoing solution can prevent the location of the station from being known by the access point or the access point system, and improves the privacy of station positioning.

Description

technical field [0001] The present invention relates to the technical field of positioning, in particular to a positioning method based on time measurement, related equipment and a system. Background technique [0002] The WiFi (Wireless Fidelity, Chinese: Wireless High Fidelity) standard IEEE 802.11 defines the Fine Time Measurement (FTM) process between two wireless communication nodes, such as Figure 1A shown. Taking the first FTM measurement process in the transmission block period (Burst Period) as an example, the FTM process is specifically as follows: at the requesting party, such as a station (Station, STA) (usually a terminal device such as a mobile phone), to the responding party, such as an access The access point (Access Point, AP), after sending the FTM measurement request, responds to the requester, and sends the measurement frame FTM_1 to the requester, and records the sending time t1_1 of the measurement frame FTM_1. Correspondingly, the requester receives ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00
CPCG01S13/765G01S13/876H04W64/006H04W64/00G01S5/0247G01S11/02G06F17/12H04W24/10
Inventor 丁志明
Owner HUAWEI TECH CO LTD
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