A Coordinated Multiple Channel Assignment Scheme and AP Deployment for Channels Reuse in Wireless Networks

• Main Authors: Huang Yao-Tian, 黃耀田
• Other Authors: Leu Fang Yie
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/15943809093632171200

碩士 === 東海大學 === 資訊工程與科學系 === 97 === In a wireless network, if single channel is employed, hidden terminal and radio interference problems may occur. The two problems are the two main factors that cause low network throughput. In fact, the hidden node problem results from radio interference. Up to present, many researchers have used multi-channel schemes to solve the interference problem. However, multi-channel results in other problems, e.g., multi-channel hidden terminal problem, and channel assignment problem. Actually, a well-defined channel assignment can effectively solve the former. Therefore, in this paper, we proposes a multi-channel assignment system, called corona-oriented multi-channel assignment system (COMAS), which coordinates channel usage in wireless networks to decrease radio interference among APs and nodes so as to improve network throughput and efficiency, particularly when many nodes are connected to APs. In COMAS, APs are deployed as concentric circles, named coronas, and channels are grouped and then allocated to coronas. We also cluster APs into groups, and schedule available channels to avoid radio interference and multi-channel hidden terminal problems occuring among adjacent AP groups and among APs in a group. Simulation results show that COMAS can effectively improve wireless-network throughput, efficiency and channel utilization.