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Published byAudrey Sherman Modified over 9 years ago
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For IEEE 802.11 Wireless LAN
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Outline Problem Description AP-station association Dynamic Load Balancing Channel Auto-selection Association Migration Practical Concern
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Problem Description Given a set of access points and some mobile stations. How to distribute these stations to get maximal bandwidth utilization. It is just a matching problem if the topology is fixed and bandwidth usage is predictable.
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AP-station association Stations always select the AP with highest received signal strength indicator (RSSI). This make many stations associate with a few APs which implies poor bandwidth utilization.
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Dynamic Load Balancing Balanced load can be archived through three levels. Channel auto-selection Let AP choose a channel with smallest interference automatically when it is booting up. Association Migration The AP may force some stations to move to other APs when necessary.
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Association First a station sends out probe request. Then APs send back probe response with addition information such as the number of stations associated with the AP or channel utilization estimate (CUE). The station choose the AP based on received information in hopes of getting a well balanced network.
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Practical Concern It is hard to change standards. Load balanced among APs does not imply that all stations get the best quality. But one only care how to get as much resource as possible. So it is reasonable to implement the whole algorithm in APs only.
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References S. Sheu and C. Wu, “Dynamic Load Balance Algorithm (DLBA) for IEEE 802.11 Wireless LAN”, Tamkang Journal of Science and Engineering, vol. 2, No 1, pp.45-52 (1999). I. Papanikos and M. Logothetis, A Study on Dynamic Load Balance for IEEE 802.11b Wireless LAN, COMCON, 2001. G. Sawma, I. Aib, K. Barbar, and G. Pujolle, A Recursive Load Balancing Technique for VoIP-dedicated WLANs, AICCSA 2008: 830-833
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