Channel assignment for reliable multicast in IEEE 802.11 b multi-radio multi-channel WMNs

Abstract

As the price of wireless interface card is getting cheaper, wireless mesh routers can equip several wireless interface cards. To improve the throughput and to minimize interference, channels must be assigned to the wireless interface cards carefully. So, this thesis deals with the channel assignment problem for reliable multicast transmission in multi-radio, multi-channel wireless mesh networks. The objective of this thesis is to maximize the minimum path success probability by properly assigning channels to reduce interference. Interference makes bit errors that lower the path success probability. Not only non-overlapping channels but also partially overlapping channels are assigned to several IEEE 802.11b network interface cards equipped in wireless mesh routers. Unlike other algorithms, the proposed algorithms in this thesis consider the physical distance among nodes as well as channel separations to reduce interference. By considering both channel separation and physical distance, the minimum path success probability can be maximized. Simulation results show that algorithms in this thesis outperform other algorithms in all cases and there are no big difference between the performance of distributed algorithm and performance of centralized algorithm which considers the fairness among the members.