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    • 5. 发明授权
    • FAST CHANNEL SWITCHING SCHEME FOR IEEE 802.11 WLANS
    • 快速信道切换的IEEE 802.11无线局域网
    • EP1486033B1
    • 2007-05-02
    • EP03702965.9
    • 2003-02-19
    • Koninklijke Philips Electronics N.V.
    • SOOMRO, Amjad
    • H04L12/28
    • H04W72/08H04W48/12H04W84/12
    • Disclosed is a method and system for switching at least one wireless node located within the coverage area of a basic-service set (BSS) or infrastructure-basic-service set (IBSS) in a wireless-local-area network (WLAN) from a first communication channel to a second communication channel. In one embodiment, the method includes the steps of: determining whether the second communication channel to be used by at least one wireless node is needed; broadcasting by a source node a management frame to at least one of the wireless node when it is determined that the second communication channel is needed, the management frame including a channel-switch time and a second communication channel identifier; and switching, at least one wireless node receiving the management frame, from the first communication channel to a second communication channel within a countdown time corresponding to the channel switch time, wherein the channel-switch time is less than a beacon interval. In an alternate embodiment, the method includes the steps of: determining whether the second communication channel to be used by at least one wireless node is needed; broadcasting by a source node a first management frame to at least one wireless node when it is determined that the second communication channel is needed, the first management frame including a channel-switch time and a second communication channel identifier; and upon receiving the broadcasted first management frame at least one wireless node, halting all further frame exchanges in the first communication channel to quiet the first communication channel.