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In this paper, the authors propose a bandwidth-efficient multicast mechanism for heterogeneous wireless networks. The reduction in the bandwidth cost of an internet protocol (ip) multicast tree by adaptively selecting the cell and the wireless technology for each mobile host to join the multicast group. This enables more mobile hosts to cluster together and leads to the use of fewer cells to save the scarce wireless bandwidth. Besides, the paths in the multicast tree connecting to the selected cells share more common links to save the wire line bandwidth. This mechanism supports the dynamic group membership and offers mobility of group members. Moreover, their mechanism requires no modification to the current ip multicast routing protocols.
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