摘要
移动通信在人们的日常生活中发挥着越来越重要的作用,受到了越来越多的重视.人们希望能够在移动的时候获得与静态联网者相同的网络服务,这里最主要的就是要解决移动切换和无线网络带宽受限的问题.由于组播技术不仅能够提供很多新型的网络应用,而且能够高效地实现多点传送,并有效节省网络带宽,因此移动和组播的相互融合对两者的应用和发展都会带来较大的促进.提出了在移动环境中部署IP组播的框架体系,即基于快速组播切换的分层移动组播体系结构(fast multicast handoff based hierarchical mobile multicast architecture,简称FHMM).FHMM通过分层移动组播管理将节点在域内的移动对外屏蔽,提高了域间组播转发树主干的稳定性.FHMM还提出了快速组播切换机制,从而减少了切换延迟以及由此引发的分组丢失.另外,当节点移动到不支持组播的子网时,FHMM仍然可以为节点提供组播服务.模拟结果显示,FHMM具有分组丢失率低、组播分组传送效率高以及组播维护开销少等优点,是一种高效的移动组播解决方案.
Mobile communication is playing an increasing role in our lives, Mobile users expect similar kinds of applications to static ones. Multicast not only brings attractive applications, but also has the benefit of saving scarce bandwidth in wireless environment. It would be fruitful to combine these two technologies. This paper proposes a framework to provide multicast in mobile environment called Fast Multicast Handoff Based Hierarchical Mobile Multicast Architecture （FHMM）. It uses a hierarchical mobile multicast architecture to isolate the local movement from outside, and improve the stability of the main multicast delivery tree. It introduces a fast multicast handoff mechanism which can reduce handoff latency and packet loss rate for inter-domain handoff and intra-domain handoff. Furthermore, FHMM is a universal solution because it can still work even if the access network does not support multicast. Simulation results show that FHMM is effective with 1 ow packet loss rate, high multicast packet delivery efficiency and little multicast maintenance overhead.
出处
《软件学报》
EI
CSCD
北大核心
2006年第1期86-95,共10页
Journal of Software
基金
国家自然科学基金
国家重点基础研究发展规划(973)~~
关键词
移动
组播
快速切换
分层结构
移动IP
mobile
multicast
fast handoff
hierarchical architecture
mobile IP
