摘要： 移动IP组播技术能有效缓解移动环境的资源受限问题，但同时也面临许多挑战. 文中提出了一个基于分层结构和快速切换的可靠移动组播方案(reliable mobile multicast scheme with hierarchical architecture and fasthandover capability, MMHFH)，该方案综合运用微移动和链路层触发技术，针对切换过程中的组播开销、切换延迟、切换丢包、同步丢失、可扩展性以及路由影响等移动特性进行优化设计. OPNET仿真实验表明，MMHFH方案具有组播树稳定、组播维护开销小、切换延迟短、切换丢包少、可靠性高、可扩展性好、组播包传送效率高等特点.

Although mobile IP multicast can adapt to scarce resource in wireless networks, it faces many technical challenges. A reliable mobile multicast scheme with a hierarchical architecture and fast handover capability (MMHFH) is proposed in this paper. MMHFH integrates micro-mobility and link-layer trigger methods, and emphasize on the mobile characteristics such as multicast maintenance overhead, handover latency, handover packet loss, out-of-synchronization, scalability and route stability. Results of simulation in an OPNET modeler show that MMHFH is an effective and reliable scheme with a more stable multicast distribution tree, less multicast maintenance overhead, shorter handover latency, lower packet loss rate, higher reliability, better scalability and higher multicast packet delivery efficiency.