QoS and Admission Controller in IEEE 802.11e WLAN

IEEE802.11 WLAN is primarily used for non-real time traffics, but in recent times real-time traffics like VoIP and video conferencing have emerged as exciting and heavily used applications in such WLAN, which needs special attention to attributes like delay sensitiveness or bandwidth requirement. The IEEE 802.11e MAC protocol produces improved performance for real time traffics in such WLAN, but when traffic increases the QoS for real time traffic is affected. In an IEEE 802.11 infrastructure WLAN, the access point (AP) is responsible for connecting mobile stations (STA) and wired stations. In particular, a station may find several APs in a WLAN and subsequently may get associated with any one of the APs. If we do not have dynamic and optimal policy for association, then STAs may associate with one of the APs. As a result, throughput in an AP will drop due to congestion even though radio resource in another AP might be available. Therefore in addition to the IEEE 802.11e MAC protocol we need some fair and dynamic STA and AP association for achieving optimized QoS in a WLAN. In this paper we analyze the performance of EDCA with NSv2.34.