A mobile network is a set of IP subnets connected to the Internet through one or more mobile routers. When a mobile router moves into or out of a subnet, it suffers from the same handover problems as a mobile node does in the Mobile IP. A seamless handover scheme with dual mobile routers is proposed for a large and fast moving network such as trains. Each of the dual mobile routers is located at each end of the moving network for space diversity, but they perform a handover as one logical mobile router. Since one of the two mobile routers can continuously receive packets from its home agent, the proposed scheme can provide no service disruption time resulting in no packet losses during handovers. Performance evaluation showed that the proposed scheme can provide excellent performance for realtime service, compared with existing schemes.
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