User roaming method, device and system in wireless local area network (WLAN)

Abstract

The invention discloses a user roaming method, device and system in a wireless local area network (WLAN). After three layers of roaming of a wireless terminal of a user, an associated field access point (FAP) receives a first message sent by the wireless terminal; the FAP searches a preset user table according to the first message to obtain a packaging entry of a first roaming tunnel for forwarding the first message, wherein the destination IP address of the tunnel outer layer of the packaging entry of the first roaming tunnel is the IP address of a home access point (HAP) before the wireless terminal roams, and the source IP address of the tunnel outer layer of the packaging entry of the first roaming tunnel is the IP address of the FAP; the FAP packages the first message according to the packaging entry of the first roaming tunnel; and the FAP sends the packaged first message to the HAP via the first roaming tunnel. In most campus network scenes, since users can roam between APs, the distance between the APs is generally not too long, thus, directly setting a tunnel between the APs can greatly shorten the forwarding path of a roaming tunnel and can obviously improve the forwarding efficiency, moreover, the setting time of the roaming tunnel is shortened, and then the user service interruption time in the roaming process is shortened.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a roaming method, device and system for WLAN users of a wireless local area network. Background technique [0002] With the increasing maturity of wireless local area network (Wireless Local Area Network, WLAN) technology, it has become a trend to provide WLAN wireless access functions in typical enterprise campus network scenarios. More and more campus networks are beginning to deploy WLAN, such as corporate office spaces, indoor / outdoor stadiums, conference venues / theaters / showrooms, classrooms / training centers, etc., to provide users with low-cost, ultra-broadband, stable and convenient, anytime, anywhere Wireless Internet experience. [0003] Among them, an important advantage of WLAN over wired access is that it supports users' mobility, and it is an important issue of WLAN to ensure that users' business experience is still smooth and unaffected during roaming. Roa...

AI Technical Summary

Problems solved by technology

In the Layer 3 roaming scenario, to ensure uninterrupted user services, the IP address carried in the packet sent by the user and the service VLAN information added by the AP cannot be changed, that is, the service VLAN information and However, since the user has roamed to a foreign network where APs joining different service VLANs are located, the message cannot be forwarded through the gateway device of the foreign network. The solution to this problem in the prior art generally uses lengthy forwarding The forwarding efficiency is low, and the user service interruption time is long during the roaming process. Therefore, how to better realize the three-layer roaming needs to be solved urgently.

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