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In the advent of emerging information super highway, voice over Internet Protocol has become a vital service with the demand for high quality of requirements in Wireless Local Area Network (WLANs). The IEEE 802.11e Standard has been recently introduced to mark the Quality of Service (QoS) competence in the ever evolving wireless local area networks. This 802.11e brings contention window, based on Enhanced Distribution Channel Access technique that offers a selected traffic to ensure least bandwidth required for the time specific applications. The EDCA technique resets statistically the contention window of the mobile station after each successful transmission.
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