Dynamic frame aggregation scheduler for multimedia applications in IEEE 802.11n networks

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• 作者：Emna Charfi ; Cé ; dric Gueguen ; Lamia Chaari ; Bernad Cousin and Lotfi Kamoun
• 刊名：Transactions on Emerging Telecommunications Technologies
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：2
• 全文大小：5216K
• ISSN：2161-3915

文摘

Providing quality of service (QoS) for real time applications over wireless local area networks is becoming a very challenging task due to the diversity of multimedia applications. Concurrently, there are numerous wireless local area networks WLAN(s) devices that are rising today. In the current paper, we focus on Institute of Electrical and Electronics Engineers (IEEE) 802.11n because it was designed to support a high data transmission rate (towards 600 Mbps). It is based on frame aggregation schemes that accumulate many subframes to be transmitted into a single larger frame. Thus overheads are reduced, efficiency and throughput are improved. However, it increases delay particularly for low rate applications. In fact, when the queue is empty, the medium access control layer (MAC) has to wait other packets to arrive in the queue to construct the whole aggregated frame. Moreover, if flows are not served, they will be accumulated in the queue causing an increased delay. To overcome these limitations, we propose a new dynamic frame aggregation (DFA) scheduler to provide QoS satisfaction to real time services. DFA schedules flows based on urgency delay and waiting delay, then it dynamically adjusts the payload size of aggregated frame. Conducted simulations prove that the proposed DFA scheduler provides QoS delay and throughput guarantee, and it reduces the number of dropped packets. Copyright