CTMS: a novel constrained tree migration scheme for multicast services in generic wireless systems

Ko-Shung Chen, Nen-Fu Huang, Bo Li

Abstract: This study considers the multicasting problem over mobile wireless systems in the context of generic wireless systems. Specifically, a novel constrained tree migration scheme (CTMS) is created to support multicast services in mobile wireless networks. The salient features of the novel CTMS include: (1) automatically recognizing the inefficiency of the multicast trees, then migrating them to better ones, while maintaining the QoS guarantees specified by mobile users; (2) conserving network resources by maintaining a low-cost multicast tree, thus accommodating more users; (3) operating efficiently in a truly distributed manner through event driven and diffusing computations, thus increasing the degree of scalability; (4) synchronizing data transmission flow for transparency during the tree migration, and thus providing seamless handoff control. Finally, the novel CTMS also handles the concurrent migration problem effectively within the wireless system, thus eliminating the oscillation paradox. Extensive simulation results show that CTMS can significantly reduce the resources used per multicast tree, thus achieving both low handoff-dropping/join-blocking rate and high resource utilization.