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Next generation heterogeneous networks require an effective handover scheme, optimized specially to support network mobility. The paper proposes an architecture to support seamless mobility of mobile networks across heterogeneous networks. We consider the vehicular scenario where a vehicle is provided with mobility through different Internet service providers (ISPs) and propose to use multiple mobile routers based handover scheme in vehicles. We carry out comparative performance evaluation of the handover performance of the proposed scheme in regard to UDP and TCP throughput, and signaling overhead. Moreover, we analyze the impact of vehicle speed and overlapping distance of access routers on packet loss. The simulation results show that the proposed scheme provides a mobile network with seamless mobility across heterogeneous networks and significantly reduces packet loss during handover.