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IEEE 802.16 WiMAX is a rapidly developing technology for broadband wire-less access systems. The IEEE 802.16 MAC layer defines two operational modes, Point-to-MultiPoint (PMP) mode and mesh mode. In the centralized protocol, all resources are controlled by Base Station (BS). In this paper, the authors propose a novel two-stage scheme for constructing an effective multicast tree. The first stage applies a significance-based algorithm to finding suitable multicast points and constructing effective multicast sub-trees. The second stage applies an interference-aware Steiner tree to connecting the source to each multicast sub-tree. Finally, an algorithm generates the final multicast tree topology. Simulation results reveal that the proposed approach outperforms others in the construction of a multicast tree and significantly reduces the interference of a mesh network.
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