Abstract
Wireless mesh networks (WMNs) have been considered as one of the key technologies for the configuration of wireless machines since they emerged. In a WMN, wireless routers provide multi-hop wireless connectivity between hosts in the network and also allow them to access the Internet via gateway devices. Wireless routers are typically equipped with multiple radios operating on different channels to increase network throughput. Multicast is a form of communication that delivers data from a source to a set of destinations simultaneously. It is used in a number of applications, such as distributed games, distance education, and video conferencing. In this study, we address a channel assignment problem for multicast in multi-radio multi-channel WMNs. In a multi-radio multi-channel WMN, two nearby nodes will interfere with each other and cause a throughput decrease when they transmit on the same channel. Thus, an important goal for multicast channel assignment is to reduce the interference among networked devices. We have developed a minimum interference channel assignment (MICA) algorithm for multicast that accurately models the interference relationship between pairs of multicast tree nodes using the concept of the interference factor and assigns channels to tree nodes to minimize interference within the multicast tree. Simulation results show that MICA achieves higher throughput and lower end-to-end packet delay compared with an existing channel assignment algorithm named multi-channel multicast (MCM). In addition, MICA achieves much lower throughput variation among the destination nodes than MCM.
Highlights
Wireless networks are a common communication environment these days
We have developed a minimum interference channel assignment (MICA) algorithm for multicast that accurately models the interference relationship between pairs of multicast tree nodes using the concept of the interference factor and assigns channels to tree nodes to minimize interference within the multicast tree
Simulation results show that MICA achieves higher throughput and lower end-to-end packet delay compared with an existing channel assignment algorithm named multi-channel multicast (MCM)
Summary
Wireless networks are a common communication environment these days. Wireless devices are widely spread out and we can use them every day. Wireless mesh routers in WMNs are typically equipped with multiple network interfaces operating on different channels to increase network throughput. One of the best ways to decrease interference in WMNs is always to assign a different channel to each wireless device instead of the same channel. Our proposed algorithm in this paper can get rid of HCP by considering every pair of nodes in the network This algorithm allows nodes in a multicast tree to work with minimum interference. This paper is organized as follows: Section 2 reviews the relevant literature regarding channel assignment for multicast in WMNs; we describe our proposed MICA algorithm and explain three procedures in detail in Section 3; Section 4 shows our simulation results, focusing on comparing the performance of MICA with that of MCM; and the last section finalizes the paper by providing conclusions
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