In this paper, we tend to propose a bandwidth-economical multicast mechanism for heterogeneous wireless networks. We have a tendency to reduce the bandwidth price of a IP multicast tree by adaptively selecting the cell and the wireless technology for every mobile host to join the multicast cluster. Our mechanism allows more mobile hosts to cluster along and cause the use of fewer cells to avoid wasting the scarce wireless bandwidth. Besides, the ways in the multicast tree connecting to the chosen cells share additional common links to save the wireline bandwidth. Our mechanism supports the dynamic cluster membership and offers mobility of group members. Moreover, our mechanism requires no modification on this IP multicast routing protocols. We tend to formulate the choice of the cell and therefore the wireless technology for every mobile host in the heterogeneous wireless networks as an optimization problem. We tend to use Integer Linear Programming to model the matter and show that the problem is NP-hard. To solve the problem, we propose an distributed algorithm primarily based on Lagrangean relaxation and a network protocol primarily based on the algorithm. The simulation results show that our mechanism will effectively save the wireless and wireline bandwidth as compared to the traditional IP multicast.
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