Method and system for switching station in centralized WLAN when WPI is performed by access controller

摘要

The embodiment of the present invention relates to a method and a system for switching station in centralized wireless local area network (WLAN) when the WLAN privacy infrastructure (WPI) is performed by an access controller (AC). The method includes: step 1: the station re-associates with the AC through the destination wireless terminal point (WTP); step 2: the AC informs the associated WTP to delete the station; step 3: the AC informs the destination WTP to join the station. The invention implements the operation of joining station and deleting station between the AC and the WTP based on the control and provisioning of wireless access points protocol (CAPWAP) control message during the process of switching station. Therefore, the invention can quickly and safely implement the station switching among the WTPs under the same AC.

主权项

1. A method for switching a station when a WPI is performed by an access controller in a centralized WLAN, comprising:
a step 1 of re-associating the station with the access controller through a destination wireless terminal point; a step 2 of the access controller instructing an associated wireless terminal point to delete the station; and a step 3 of the access controller instructing the destination wireless terminal point to add the station, wherein the step 1 comprises: a step 11 of the station listening passively to a beacon frame of the destination wireless terminal point and acquiring parameters of the destination wireless terminal point including a WAPI information element which comprises suites of WAI authentication and key management and suites of ciphers supported by the destination wireless terminal point; a step 12 of the station, in a local MAC mode, transmitting a link authentication request frame to the destination wireless terminal point to request for verifying a link to the destination wireless terminal point, and the destination wireless terminal point transmitting a link authentication response frame to the station in response to the link authentication request frame of the station; or in a split MAC mode, transmitting a link authentication request frame to the access controller to request for verifying a link to the access controller, and the access controller transmitting a link authentication response frame to the station in response to the link authentication request frame of the station; and a step 13 of the station, upon successful verification of the link, transmitting a re-association request frame containing an identifier of the currently associated wireless terminal point, an identifier of the access controller and an WAPI information element to the access controller to request for being re-associated with the access controller, wherein the WAPI information element determines a suite of WAI authentication and key management and a suite of ciphers selected by the station, which are the same as those suites selected by the station upon initial association with the access controller, and the access controller parsing the re-association request frame of the station and transmitting a re-association response frame to the station.