Method and system for expanding 802.11 radio local network

Abstract

This invention provides a method and a system for expanding 802.11 WLAN, in which, the method includes: appointing an access control server in a WLAN, an access controller registers and authenticates its identity to said server, which stores the information of the controller, a control tunnel and a two-layer data tunnel are set up between the controller and the server and the WLAN realizes star-state expansion, in this way, multiple access controllers can set up an unified WLAN so as to expand 802.11 WLAN and realize that the working stations can roam seamlessly and quickly in the net based on said WLAN and a method of data re-direction and transmission.

Description

technical field [0001] The present invention mainly relates to the transmission of digital information, in particular to a method and a system for expanding a wireless local area network (WLAN, Wireless Local Area Network) based on the 802.11 standard by establishing a connection between access controllers (AC, Access Controller). Background technique [0002] IEEE (Institute of Electrical and Electronics Engineers) 802.11 is one of the first generation wireless LAN standards. This standard defines the specifications of the physical layer and the Media Access Control (MAC) protocol, allowing manufacturers of wireless local area networks and wireless devices to establish interoperable network devices within a certain range. This standard is mainly used to solve the wireless access of user terminals in office LAN and campus network. [0003] According to the above agreement, in the wireless local area network, users of wireless terminal equipment, especially laptop computer u...

AI Technical Summary

Problems solved by technology

[0013] Defects: such as figure 2 As shown, the access controllers AC1 and AC2 independently manage their access points and independently provide wireless access services, so that a theoretical wireless local area network is actually two completely independent wireless local area networks, and the access controllers AC1 and AC2 Only through the fixed network FN to communicate with each other, it is impossible to provide a wireless access service of a unified wireless local area network

[0014] Flaw 2: When workstations move, seamless roaming between access points cannot be achieved

However, the access user information of all workstations STA2 is stored on the access controller AC1, and the access controller AC2 cannot determine that the user is a roaming user, nor can it redirect the access of the workstation STA2 to the access controller AC1. Therefore, the workstation STA2 must perform all access authentications with the access controller AC2 before re-accessing the WLAN.

However, the access authentication process often takes a long time, so the WLAN access service cannot guarantee the uninterrupted application services of the workstation STA2, that is, it cannot support the seamless and fast roaming of the workstation STA2

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