Method for selecting access point by vehicle-mounted WiFi (Wireless Fidelity) equipment

A device selection and access point technology, applied in the field of communication, can solve the problems of slow AP scanning speed, unstable data transmission, slow AP switching speed, etc., to achieve the effect of improving stability

Inactive Publication Date: 2011-02-16
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0004] In the actual deployment and application of opportunistic networks, WiFi, as the basic communication channel between nodes, plays a decisive role in the performance of the entire network. However, in the current use of WiFi, AP scanning speed is slow, the association process takes a long time, and AP switching speed is slow. And other problems, so that the disconnection times and packet loss rate of the on-board WiFi device access data transmission are relatively high, and the data transmission is unstable

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  • Method for selecting access point by vehicle-mounted WiFi (Wireless Fidelity) equipment

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Embodiment Construction

[0035] The meeting connection time prediction of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0036] In this embodiment, the vehicle passes two unknown APs on the roadside at a speed v of 20 m / s, which are called A and B respectively. Such as figure 1 As shown in , the vehicle detects the signal strength of two APs, and the vehicle scan time interval is 0.5 seconds. Suppose the vehicle travels along the x-axis at a speed v, and at t i (i=1, 2...) Measure the RSSI value s of access point A and access point B at all times Ai (i=1, 2...) and s Bi (i=1, 2...), respectively get a series of samples (s Ai , t i ) and (s Bi , t i ).

[0037] A method for selecting an access point for a vehicle-mounted WiFi device, such as image 3 shown, including the following steps:

[0038] Step 1: The vehicle periodically scans APs, records the detected AP signal strength, MAC address and detection time, and class...

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Abstract

The invention provides a method for selecting an access point by vehicle-mounted WiFi (Wireless Fidelity) equipment, belonging to the field of communication. The method comprises the following steps of: firstly, periodically detecting signal intensity of peripheral APs (Access Points) by the vehicle to obtain the signal intensity of the peripheral APs; converting a detected AP signal intensity value into a distance value for each AP according with the specified number of detection records, and further pre-estimating a position of each AP to obtain a prediction coordinate of the AP; then calculating meeting connection time of each AP according to the prediction coordinate of the AP; and finally associating the APs with the longest meeting time. The method for selecting the access points can reduce disconnection frequency and a packet loss rate of the vehicle-mounted WiFi equipment access data transmission, and improve the stability of data transmission.

Description

technical field [0001] The invention belongs to the communication field, and is an application method of a vehicle-mounted WiFi device, in particular to a method for selecting an access point of a vehicle-mounted WiFi device. Background technique [0002] Opportunistic networks are a new type of network that has emerged in recent years. In an opportunistic network, network nodes are divided into multiple isolated connected areas. There may not be an end-to-end path between the source node and the destination node. The movement of the node makes the node meet other nodes to form a communication opportunity. The data follows the node The movement and forwarding between mobile nodes realize the transmission. The characteristic of this type of network is that although the transmission delay is large, the data transmission cost is low, and it is especially suitable for environments where it is difficult to set up network infrastructure. [0003] With the maturity of IEEE802.11 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04W48/16H04B17/00
Inventor 牛建伟杜国平童超
Owner BEIHANG UNIV
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