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Network mobility (NEMO) basic support protocol (NBS) enables mobile networks to work well under Internet, but leads to pinball routing problem. A MAP based route optimization scheme (MROS) is proposed to provide route optimization and reduce mobility management overhead for mobile networks. MROS uses MAP which is a mobility management technique in HMIPv6 to construct a hierarchical mobile network, MNpsilas registration cost is reduced with regional management. Moreover, a route optimization scheme is also introduced by MROS to eliminate pinball routing with regard to NBS.