摘要：The IEEE 802.11e standard provide services to different applications with the required Quality of Service (QoS) by using differentiated channel access scheme for vast verity of real time traffic categories. It introduced a contention based Enhanced Distribution Channel Access (EDCA) mechanism that provides a prioritized channel access to guarantee the minimum bandwidth required for the streaming traffic. To allow high priority dataflow and enhance the channel throughput in a heavily loaded IEEE 802.11e EDCA Wireless Local Area Network (WLAN), we propose new adaptive differentiation techniques that consider the network state before readjusting the Contention Window (CW). Also an admission control algorithm which manipulate the CWmin factor to improve the performance of WLAN with guaranteed throughput and delay.
