![]() With EDCA, the and values varies with traffic type thereby regulating the backoff interval for different traffic classes and ensure quicker access for delay sensitive traffic. One of the channel access parameters is the Contention Window (CW). ![]() In order to incorporate quality of service, the Enhanced Distributed Channel Access (EDCA) scheme was introduced which gives different traffic classes different contention parameter values to use in accessing the WLAN. Stations operating the DCF channel access scheme contend for air time with the same contention parameter values which implies that time sensitive traffic are not given priority in accessing the wireless medium. Initially, the IEEE 802.11 WLAN technology only provide best effort services with no quality of service (QoS) assurances due to the fact that the contention based Distributed Coordination Function (DCF) shares network capacity equally among contending users. With increasing bandwidth, wireless networks are now experiencing more users who generate network traffic requiring service guarantees making it imperative that methods of enhancing performance on the wireless network be researched. The IEEE 802.11 Wireless Local Area network (WLAN) is a widely deployed communication technology due to its cost effectiveness, ease of deployment, flexibility and lack of mobility constraints.
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