Abstract
this paper discusses the cost functions of the three multicast schemes Bi-directional Tunneling, Remote Subscription and Agent Based. To developed from a probability model of engagement between any mobile network nodes in multicast group to a home agent. So the performance parameters required taken under continuous session duration constraints, taken in account the effects of nesting topology of Network mobility system and movement of it NEMO cluster. The cost functions of providing multicast among BT, RS and AB are compared. Then we used the probabilities of multicast anchor agent forwarding data to their destinations, to formulate the multicast path function as a 0-1 knapsack problem_1 to show the selected items ( multicast paths) according to the mentioned optimization selection conditions. It was shown that the performance of AB multicast schemes is better than BT and RS.