Design of a Load balancing mechanism for infrastructure-based 802.11 WLANs

• Main Authors: I-YungChen, 陳宜詠
• Other Authors: Chu-Sing Yang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/58158591182054327864

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 101 === Wireless local area networks (WLANs) have spread so rapidly and developed dramatically in areas such as homes, public hotspot, airports, and offices etc. With the dense deployment of access points (APs) and lacking of the sufficient frequency resources, the signal interference problem has become more serious, resulting the throughput degradation of the users. For schools and offices, APs may be constructed in centralized way, but for public hotspot or homes, APs are setting up in distributed way. Such placement without any concerted planning will bring the severe signal interference problem. We propose a distributed dynamic channel assignment (DCA) algorithm which works on a distributed coordination function (DCF)-based architecture for improving network throughput and decreasing the computation complexity by maximizing the sum of weighted signal to interference plus noise ratio(SINR). Besides, we combine the power control and channel assignment. Our algorithm improves the ratio of power saving by at least 2.7% in high density environment. Today’s WLANs use 802.11 standards that support multi-rate and the people gather in certain places which will bring the load imbalance problem. Our centralized mechanism which works on a point coordination function (PCF)-based architecture and uses a controller to periodically adjust the AP that carry heavier traffic load. Simulation results show the effectiveness of the proposed mechanism and compare the performance with the other method.