A distributed channel assignment algorithm for uncoordinated WLANs

Authors:
Xiaonan Yue;Chi-Fai Wong;S.-H. Gary Chan
Affiliations:
Department of Computer Science and Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong;Department of Computer Science and Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong;Department of Computer Science and Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong
Venue:
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
Year:
2010

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Abstract

IEEE 802.11 WLANs are becoming more and more popular in homes and urban areas. As opposed to traditional WLANs, the access points (APs) in these networks are often deployed by network non-specialists in an uncoordinated manner, leading to unplanned topology, interference and unsatisfactory throughput performance. We consider in this paper a distributed channel assignment algorithm for uncoordinated WLANs, where APs can self-configure their operating channels to minimize interference. We propose an efficient, simple and distributed algorithm termed CACAO (Client-Assisted Channel Assignment Optimization). In CACAO, an AP makes use of the traffic information fed back by its clients to make channel assignment decision. This leads to better knowledge on network environment and better channel assignment decision at the APs. We conduct extensive simulation study and comparisons using Network Simulator 2 (NS2). Our results show that CACAO out-performs other traditional and recent schemes in terms of throughput with similar level of fairness. Furthermore, it converges quite fast to reduce interference to a low level.