A novel contention-on-demand design for WiFi hotspots

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• 作者：Li Feng ; Jiguo Yu ; Xiuzhen Cheng ; Mohammed Atiquzzaman
• 关键词：IEEE 802.11 ; “Hot ; spot” networks ; Admission control
• 刊名：Personal and Ubiquitous Computing
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：20
• 期：5
• 页码：705-716
• 全文大小：891 KB
• 刊物类别：Computer Science
• 刊物主题：User Interfaces and Human Computer Interaction
  
• 出版者：Springer London
• ISSN：1617-4917
• 卷排序：20

文摘

In widely deployed wireless “hot-spot” networks, nodes frequently join or leave, and inelastic/elastic and saturated/nonsaturated flows coexist. In such dynamic and diverse environments, it is challenging to maximize the channel utilization while providing satisfactory user experiences. In this paper, we propose a novel contention-on-demand (CoD) MAC scheme to address this problem. The CoD scheme consists of a fixed-CW algorithm, a dynamic-CW algorithm, and an admission control rule. The fixed-CW algorithm allows elastic flows to access limited system bandwidth; the dynamic-CW algorithm enables inelastic flows to contend for channel on demand and quickly adapt to network change; and the admission control rule rejects overloaded traffic for providing good user experiences. We then perform an asymptotic analysis to develop a simple and practical admission control rule for homogeneous and heterogeneous traffic; our rule can not only adapt to the change in offered loads and node number, but also maximize the system utilization. Finally, extensive simulations verify that our scheme is very effective and our theoretical result is very accurate.