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The IEEE802.11 protocol defines access techniques to wireless medium using CSMA/CA, and defines two modes of operation in WLAN DCF and PCF. DCF does not provide any QoS, so that throughput and delay of real-time traffic, such as voice and video cannot be guaranteed over WLAN. IEEE 802.11e introduces a service differentiation mechanism based on prioritized contention access, which causes throughput...
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