Fast switching method for WLAN

A wireless local area network, fast switching technology, applied in wireless communication, electrical components, etc., can solve the problem of long switching scanning time, etc., and achieve the effect of reducing the delay of switching

Active Publication Date: 2009-07-15
TRAFFIC CONTROL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] It can be seen from the above description that the switching delay of the wireless LAN is mainly affected by the scanning delay (passive scanning mode) or the inquiry delay (active scanning mode) of the scanning process, and the scanning process or the inquiry process usually needs to be checked one by one. For example, it takes 200ms to scan one channel, and it takes 2.2s to scan 11 wireless LAN channels. This switching scan time is too long for some applications.

Method used

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  • Fast switching method for WLAN
  • Fast switching method for WLAN
  • Fast switching method for WLAN

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Embodiment Construction

[0048] In the wireless local area network protocol, it is stipulated that the beacon frame is sent approximately periodically at a certain time interval, and the content of the beacon frame is shown in Table 1:

[0049] Table 1. Contents of the beacon frame

[0050] serial number information Remark 1 timestamp 2 beacon interval 3 ability 4 Service Set Identifier (SSID) 5 supported rate

[0051] 6 frequency hopping parameter set The frequency hopping parameter set information is located in the physical layer using the frequency hopping

Beacon frame 7 Direct Spread Spectrum Parameter Set 8 CF (competition-free) parameter set The CF parameter set is located in the AP that supports the PCF mode.

Beacon frame 9 Independent Basic Services Group (IBSS)

Number set The information element of IBSS parameter set information is located in the IBSS network

In the beacon frame generated...

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Abstract

The invention relates to a rapid switching method for a wireless local area network, wherein, in a beacon frame being sent, an access point contains a channel used by an adjacent access point, SSID (service set identifier) and BSSID (basic service set identifier) information; a mobile station receives and stores the information of a target access point in the beacon frame, and when switching condition is satisfied, the information is used as a reference for selecting the target access point in switching. The mobile station preferentially searches the beacon frame or sends a polling request frame on a channel appointed by the information, and selects a next access point needing to be switched according to the RSSI (received signal quality indication) of the beacon frame or a polling response frame. Through the rapid switching algorithm of the invention, the mobile station does not need to scan all channels in the wireless local area network, thus greatly reducing switching delay.

Description

technical field [0001] The invention relates to a fast switching method of a wireless local area network, which belongs to the field of data transmission in communication systems. Background technique [0002] Due to its fast transmission rate, simple installation and low cost, wireless local area network has been widely used in daily office, home applications and some engineering projects. The wireless local area network standard is defined by the IEEE802.11 wireless local area network working group, which was published in June 1997. It is one of the first generation wireless local area network standards. The standard defines the physical layer and media access control (MAC) specifications, allowing manufacturers of wireless LAN and wireless equipment to create interoperable network equipment. The physical layer in the 802.11 standard defines the signal characteristics and modulation of data transmission. In this standard, the RF (radio frequency) transmission standard is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08
Inventor 蒋海林步兵郜春海唐涛
Owner TRAFFIC CONTROL TECH CO LTD
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