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As IEEE 802.11 wireless local area network (WLAN) devices currently have gained wide popularity, demands on quality of service (QoS) capability have increased as well. Although IEEE 802.11e is proposed for the support of QoS by traffic and service differentiation, it still has weakness on the adapting the multimedia service which has the traffic characteristic of variable bit rate (VBR). In this paper, we first discuss problems of the current standard and analyze how to improve the QoS capability in IEEE 802.11e. In addition, we propose a new scheduling algorithm, referred to as ETA-EQN, which aims at supporting multimedia services in HCCA of IEEE 802.11e WLAN. Results from intensive simulations with NS-2 verify that ETA-EQN provides much better network performance in terms of throughput, delay, and packet loss.

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Due to the growth of the wireless technology, demands on Quality of Service (QoS) in wireless networking have increased. Although IEEE 802.1le has been proposed for the support of the QoS, it still has weakness on the adapting varying profiles of multimedia traffic. Especially, Variable Bit Rate (VBR) streams cannot be supported in the current standard in terms of delay. In this paper, we first investigate problems of the current standard, and then propose a new scheduling algorithm, Explicit Traffic Aware (ETA) scheduler. The novelty of proposed scheme is the accurate adaptation of scheduling with the queue length information contained on Explicit Queue length Notification (EQN) frame from mobile stations. We simulate the performance of ETA scheduler and compare the results with the reference scheduler in the current standard, CBR scheduler.