Unlike wired networks, the capacity of a wireless network is interferencelimited due to the broadcast nature of wireless medium. Some multicast wirelessnetwork protocols do not consider channel assignment issue, that they causeinterference at transmission nodes, hence do not use full capacity of thenetwork. Interference can be reduced and throughput improved with the use ofmultichannel features. Therefore, this paper used orthogonal channels forsending and receiving nodes in the network. We propose EWM (Efficient WirelessMulticast) method that is distributed scheme for constructing multicast tree inmulti-channel multi-interface wireless mesh networks (MIMC-WMN) which selectsrelay nodes and in distributed form assign orthogonal radio channels to them.To more decrease of interference in adding a branch to the tree, the route withminimum end-to-end delay from the source to the multicast receiver will bechosen. Thus, the tree is suitable for multimedia applicants. We also employthe broadcast nature of the wireless media to reduce the number of relay nodes.The proposed algorithm is compared with MCM algorithm in NS2.
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