Fast switching method based on movement detection in wireless network

A fast switching and motion detection technology, applied in wireless communication, electrical components, etc., can solve the problems of imperfect switching mechanism and inability to meet real-time multimedia services, etc., and achieve the effect of fast switching and reducing switching delay

Active Publication Date: 2009-10-14
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the switching mechanism of the traditional 802.11 protocol is not perfect. When the mobile node switches between APs, it t

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  • Fast switching method based on movement detection in wireless network
  • Fast switching method based on movement detection in wireless network
  • Fast switching method based on movement detection in wireless network

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Embodiment Construction

[0018] In order to achieve the objective of the present invention, the present invention provides a fast handover method based on motion detection, which will be described in detail below with reference to the accompanying drawings.

[0019] The traditional 802.11 protocol switching process requires three steps: channel scanning, authentication, and reconnection. The number of scanned channels is the key to the extension of the switching time. Such as figure 1 As shown, in the traditional 802.11 protocol, the mobile node needs to scan all channels, which is inefficient. If you know the AP channel to switch in advance, you can omit the channel scanning process and significantly reduce the switching delay.

[0020] The fast switching method of the present invention first obtains the moving speed and moving direction of the mobile node through the movement detection algorithm, and then selects the AP that the mobile node may switch to according to the AP selection algorithm, and fin...

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Abstract

The invention discloses a fast switching method based on movement detection in a wireless network, comprising the following steps: movement detection: firstly, a distance between a AP and a movable node is estimated by collecting a RSSI value in a movable node data packet, secondly, the position information of the movable node is obtained by using node location so as to predict the move direction and the mode speed of the movable node with the position information; AP selection: proper neighbor AP is selected according to the move direction and the move speed of the movable node so as to be provided to the movable node for switching; and fast switching: the fast switching of the movable node is realized by amending traditional 802.11 protocol. The invention uses the movement detection method to predict the nest switched AP of the movable node by amending the traditional 802.11 protocol, when the movable node needs to be switched, only need to scan a signal path in which the preliminarily selected AP is located, therefore, switching time delay is reduced and the fast switching is realized.

Description

Technical field: [0001] The invention relates to a fast switching method of a mobile node in a wireless network, which specifically uses an AP to locate the mobile node, detects the moving speed and moving direction of the mobile node, and realizes a fast switching method by modifying the traditional IEEE 802.11 protocol. Background technique: [0002] The current implementation of wireless local area networks is based on the traditional 802.11 protocol. In the 802.11 protocol, mobile nodes access the Internet through APs, and each node can only connect to one AP at the same time, and each AP has only limited coverage, which leads to users It is necessary to switch when moving from one AP area to another AP area. [0003] However, the traditional switching mechanism of the 802.11 protocol is not perfect. When the mobile node switches between APs, it takes a long time to reestablish the connection, which is far from meeting the needs of real-time multimedia services and the requir...

Claims

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Application Information

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IPC IPC(8): H04W36/26H04W36/30H04W36/32
Inventor 孙杰李文中陆桑璐陈道蓄
Owner NANJING UNIV
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