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(A Multicast Tree Extension Scheme in Mobile IP)  

Kim, Byung-Soon (Dept.of Computer Information, Daegu Technology College)
Han, Ki-Jun (Dept.of Computer Engineering, Kyungpook National University)
Abstract
This paper proposes a Multicast Tree Extension (MTE) scheme for multicast in IP-based wireless networks. If a group receiver Joins a multicast group in a visited foreign network, multicast service may be disrupted when the foreign network does not have a multicast router. To avoid disruption, our scheme creates a bi-directional tunnel between the previous foreign agent (FA) and new foreign agent, if a mobile node (MN) moves from a foreign network with multicast capability to another foreign network with non-multicast capability. The MN thus continues to receive the multicast packets through the tunnel from the previous FA. Our scheme can avoid a long latency due to a long tunneling for group membership as well as multicast service disruption, even if the MN enters foreign networks with non-multicast capability. Simulation results show that our scheme offers lower costs for multicast delivery, tunneling and handoff latency than the existing scheme.
Keywords
IP-based wireless network; Multicast Handoff; Multicast Tree Extension;
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