A new per-class flow fixed proportional differentiated service for multi-service wireless LAN

Authors:
Meng Chang Chen;Li-Ping Tung;Yeali S. Sun;Wei-Kuan Shih
Affiliations:
Institute of Information Science, Academia Sinica, NanKang, Taipei 115, Taiwan, ROC;Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan, ROC;Department of Information Management, National Taiwan University, Taipei, Taiwan, ROC;Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan, ROC
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2007

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Abstract

In this paper, we propose a new per-CLAss Flow fixed proportional differentiated service model (CLAF) and a companioning medium access control scheme for multi-service wireless LANs (WLANs), based on the IEEE 802.11 framework. Different from conventional relative differentiated service, in CLAF, a fixed bandwidth quality ratio is guaranteed on per-class per-flow basis regardless of the traffic load of each service class. Specifically, each service class is assigned a number of separate coordination periods, proportional to the policy-based bandwidth quality ratio for class isolation. Each class is associated with its own contention window size which is dynamically adjusted in accordance with the number of flows in the class in such a way to minimize collision probability between flows of the same class. Simulations results of the CLAF performance as well as a comparison with IEEE 802.11e EDCA including the support of QoS-sensitive VoIP applications are presented. The results show that the proposed scheme outperforms EDCA and achieves better resource utilization efficiency. CLAF can provide users a more predictive, affirmative service guarantees than conventional relative differentiated service like IEEE 802.11e EDCA.