一种基于组播的移动IP跨层切换机制

根据无线移动Internet的特点，利用跨层设计的方法，设计了一种无线移动IP切换机制。该机制在网络层利用组播协议将数据分组转发至移动主机，在链路层利用链路触发信息控制组播树的形成。理论分析表明，同传统的移动IP协议及分级移动IP协议相比，该机制能有效地降低移动主机的网络层切换时延，显著减少网络层切换引起的分组丢失。并有效减少无线链路上的无线信令数量，节省大量无线资源。

A Multicast-Based Cross Layer Handover Scheme for Mobile IP

According to the feature of mobile Internet over wireless link, a new handover scheme for mobile wireless IP networks is presented based on the idea of cross-layer design. The proposed scheme will forward the packets to the mobile host in the network layer with multicast protocol and employ the trigger information from the link layer in order to construct the multicast tree. The numerical analysis discloses that the proposed scheme can shorten more handover delay and reduce the packets loss ratio more efficiently than mobile IP protocol and hierarchical mobile IP protocol. The signaling cost during the handover also decreases obviously in the proposed scheme so that plenty of radio resource is saved.