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Mobility-prediction-based wireless fidelity (WiFi) speed self-adapting selecting method

A rate-adaptive, coordinate-predicting technology, applied in the field of communications to improve data transmission bandwidth

Inactive Publication Date: 2011-05-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology does not have a method that can always match an appropriate communication rate to ensure the highest communication bandwidth as the communication distance between the WiFi device and the access point changes

Method used

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  • Mobility-prediction-based wireless fidelity (WiFi) speed self-adapting selecting method
  • Mobility-prediction-based wireless fidelity (WiFi) speed self-adapting selecting method

Examples

Experimental program
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Embodiment

[0062] Such as figure 2 , image 3 As shown, the vehicle passes the roadside AP along the x-axis at a speed of v=20m / s. The vehicle maintains association with the AP and detects the signal strength of the AP. The x-axis travels forward, at t i (i=1, 2...) measure the RSSI value of the AP at all times, and obtain a series of samples (R i , t i ), adopt the method of the present invention to carry out WiFi rate adaptive selection, then change the WiFi device transmission rate in real time, so that the set WiFi data rate is more consistent with the actual wireless environment, and improve the data transmission bandwidth during vehicle movement. Figure 4 The difference in speed selection of the speed adaptation algorithm adopted by this method and the HTC G1 mobile phone is shown. The improved speed in the figure is the result of applying the present invention. The speed curve of the present invention is compared with the speed curve of the G1 mobile phone, and the speed of t...

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Abstract

The invention provides a mobility-prediction-based wireless fidelity (WiFi) speed self-adapting selecting method, which belongs to the communication field. Firstly a vehicle WiFi device continuously detects the strength of access point (AP) signals nearby, the strength value of the detected AP signal is converted to a corresponding distance value, and the movement trend of the vehicle WiFi deviceis predicted according to a plurality of distance values; and a data speed of the WiFi device is selected according to the movement trend of the vehicle WiFi device and a distance-data speed table which is obtained through the experiment. By the method provided by the invention, the shaking of the data speed of the WiFi device during the moving process of a vehicle can be reduced, and the data transmission efficiency can be improved.

Description

technical field [0001] The invention belongs to the communication field, and relates to a WiFi device rate self-adaptation method, in particular to a mobile prediction-based WiFi rate self-adaptation method. Background technique [0002] The initial design goal of WiFi (Wireless Fidelity) technology is to provide users with wireless access services in fixed areas, and typical devices are mainly notebook computers. However, with the continuous popularization of WiFi technology and the extensive use of WiFi devices, WiFi communication modules can be easily integrated into platforms such as mobile phones, handheld computers, and even wearable computers. The miniaturization of mobile terminals has greatly improved the mobility of WiFi devices, which has also brought about changes in usage scenarios. For example, a user holding a mobile phone with WiFi communication functions may sit in a driving car and hope to access roadside Access Point. This highly dynamic scene change wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W24/08H04W28/22
Inventor 牛建伟杜国平童超
Owner BEIHANG UNIV
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