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EEE 802.11 Wireless LANs are increasingly being used in enterprise environments for broad-band access. Such large scale IEEE 802.11 WLAN deployment implies the need for client mobility support; a mobile station has to be "Handed off" from one Access Point to another. Seamless handoff is possible for data traffic, which is not affected much by the handoff delay. However, voice traffic has stringent QoS requirements and cannot tolerate more than 50ms net handoff delay. The basic IEEE 802.11 handoff scheme (implemented in Layers 1 & 2) only achieves a handoff delay of 300ms at best, leading to disrupted connectivity and call dropping.
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