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Fast switching method for wireless local area network

A wireless local area network, fast switching technology, applied in the direction of wireless communication, radio/inductive link selection arrangement, data exchange through path configuration, etc., can solve system paralysis, STA unable to access the network, switching scanning and lack of security in authentication protection mechanism etc.

Inactive Publication Date: 2008-01-23
XIDIAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] 2. Make STA unable to access the network:
[0020] To sum up, the technical defects of the existing technical solutions are: the handover delay is relatively long; the necessary security protection mechanism is lacked when switching frequency scanning and authentication, and there are potential safety hazards that may cause the system to paralyze or prevent STAs from accessing the network

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  • Fast switching method for wireless local area network
  • Fast switching method for wireless local area network
  • Fast switching method for wireless local area network

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Embodiment Construction

[0088] Below, the handover method of the present invention will be described in detail with reference to the accompanying drawings.

[0089] As shown in Figure 2, when the frequency scanning starts, the STA selects the APs that meet the conditions as the scanned AP set APs:

[0090] d=D-xD so >D sn ,

[0091] Among them, x is the location where the handover occurs, D is the distance between the STA and the associated AP, r is the coverage radius of the AP’s transmit power, and when the STA randomly moves from oAP to nAP and performs handover (starts frequency scanning), the distance from the STA to the oAP is D. so , the distance to nAP is D sn , where the STA position can be obtained by methods such as the Global Positioning System (GPS);

[0092] The process of the STA selecting an AP takes time t1, and then the STA directly sends a probe request frame to one of the scanned APs, and waits for time t2. If a probe response frame is received, the STA starts to complete oth...

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Abstract

The present invention provides a fast handoff method in a wireless Local Area Network, the method is that a line mobile node STA selects an Access Point aggregation of the Wireless Local Area Network swept the frequency; the STA performs the interaction of the unicast type detecting and authenticating information to the AP aggregation, completes an active frequency sweep process, and selects a goal AP; the STA and the goal AP are associated newly. The present invention also provides a fast handoff method by adopting the unicast type active sweep-frequency and augmenting the safety during the two stages of the re-authentication. A technical proposal provided by the present invention merges the two stages of the sweep-frequency and the re-authentication into one sweep-frequency authentication stage, and the unicast type active sweep-frequency method is also adopted, to effectively decrease the waiting time consumed in a channel and reduce the handover time delay; a Message Integrity Identifying Code is joined during the interaction of the sweep-frequency authentication information, to enhance the safety of the switch. The other technical proposal also decreases the waiting time consumed in the channel, decreases the handover time delay, and enhances the safety of the switch.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a fast switching method in a wireless local area network. Background technique [0002] In recent years, the development of intercommunication technology between wireless mobile nodes (STAs) and wireless local area network access points (APs) has promoted the promotion and application of wireless local area networks (WLANs) around the world. It has become an important trend to provide multimedia data services such as voice and video for STAs. The technology hotspot of WLAN development, and the core of this technology is that fast switching should have security and low delay. [0003] In the same extended server (ESS), the fast switching of STA between APs mainly includes three processes of frequency scanning, re-authentication and re-association. Active frequency scanning is recommended in the released IEEE802.11 WLAN standard, as shown in Figure 1, and its handov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04L12/28H04W12/041H04W12/0431H04W12/06H04W12/106H04W36/08H04W48/16
Inventor 杨卫东马建峰姚忠辉张帆曹春杰王巍杨超李亚辉
Owner XIDIAN UNIV
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