Two-Tier Dynamic Wi-Fi Load Balancing based on Software Defined Networking
碩士 === 國立交通大學 === 資訊學院資訊學程 === 103 === This work investigates the user congestion problem on Wi-Fi networks with the Software Defined Networking (SDN) approach. For traditional Wi-Fi networks, the loading of Access Points (APs) would be unbalanced if most users connect to the same AP which causes us...
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2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/t97e63 |
| Summary: | 碩士 === 國立交通大學 === 資訊學院資訊學程 === 103 === This work investigates the user congestion problem on Wi-Fi networks with the Software Defined Networking (SDN) approach. For traditional Wi-Fi networks, the loading of Access Points (APs) would be unbalanced if most users connect to the same AP which causes user congestion. The traditional Wi-Fi systems use a distributed method to exchange AP’s loading and capacity information to improve the congestion problem. Compared to SDN-based centralized control methods, it lacks a global view to make a precise decision. Our SDN approach adopts the two-tier AP-controller architecture for load balancing and utilizes OpenFlow extension messages to report the AP information to the controller. The controller computes “balance degree” to evaluate the degree of load balancing and “Control Level” to decide up to which load level APs can accept the association requests without consulting the controller. From our experiment results, our approach yields 34%~41% of improvement on balance degree that compared to the networks without load balancing method and saves 28%~36% of the re-association time that compared to the centralized networks with positive control.
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