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The Design and Evaluation of a Scalable Wireless MAC Protocol

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Title: The Design and Evaluation of a Scalable Wireless MAC Protocol
Author(s): Chen, Chun-cheng; Seo, Eunsoo; Luo, Haiyun
Subject(s): wireless networks
Abstract: Contention-based MAC protocols such as IEEE 802.11 DCF are known to perform well in a network with small number of nodes. As the number of nodes increases, the cost of collisions increases and dominates. This increasing collisions quickly drives every client in the network into wasted and unfair idleness, resulting in performance degradation. In this paper, we propose SMAC, a scalable MAC protocol, that preserves the advantages of 802.11 while avoiding its drawbacks. The design of SMAC leverages the efficient channel utilization of 802.11 DCF at low load and 802.11 PCF at high load. The SMAC-enabled AP controls the access of its clients by combining the contention and schedule-based access mechanisms and determining the optimal contention level among the clients. The SMAC-client simply indicates its intention of channel access. Through thorough analysis and evaluation, we show that SMAC preserves the channel utilization efficiency of 802.11 DCF, scales up to any number of nodes, and preserves perfect short-term and long-term fairness among the contending clients.
Issue Date: 2006-11
Genre: Technical Report
Type: Text
URI: http://hdl.handle.net/2142/11274
Other Identifier(s): UIUCDCS-R-2006-2793
Rights Information: You are granted permission for the non-commercial reproduction, distribution, display, and performance of this technical report in any format, BUT this permission is only for a period of 45 (forty-five) days from the most recent time that you verified that this technical report is still available from the University of Illinois at Urbana-Champaign Computer Science Department under terms that include this permission. All other rights are reserved by the author(s).
Date Available in IDEALS: 2009-04-21
 

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