Preconfigured Multicast Delivery Tree in Mobile IP

Multicasting over mobile IP network becomes more important with the increasing needs of supporting multimedia services in mobile network. The IETF has suggested two approaches which are remote subscription and bidirectional tunneling for supporting mobility management in multicasting over mobile IP. But, these protocols have problems - the frequent reconstruction of multicast delivery tree, packet loss during handoff, convergence problem, and so on. In this paper, we propose to use preconfiguration of multicast delivery tree when mobile host enters the foreign network. It will decrease the frequency of multicast delivery tree reconstruction, and reduce the packet loss during handoff. Also the multicast delivery tree maintained by Keep Alive messages makes the signaling overload of networks diminished.