In Fig. 1, we show the reliable mobility management architecture. The components of the architecture consist of mCSN, IMMS, and CWC. The IMMS maintains the local information of mCSN, e.g., IP addresses, Holding Flag (H_Flag), in the MMT. MMT stores the up-to-date mobility management information by keeping track of the changed IP address of a mCSN. The Local Binding Cache (LBC) at MMT locally maintains the permanent IP address P_Addr, temporary IP address T_Addr, and lifetime. T_Addr and lifetime are obtained from the edge router in visited network, either accessing DHCPv6 server or using stateless IP autoconfig mechanism.