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The LTE (Long-Term Evolution) technologies defined by 3GPP are the last step toward the 4th Generation (4G) of radio technologies designed to increase the capacity and speed of mobile telephone networks. Mobility management for supporting seamless handover is the key issue for the next generation wireless communication networks. The Evolved Packet Core (EPC) standard adopts the Proxy Mobile IPv6 protocol (PMIPv6) to provide the mobility mechanisms. However, the PMIPv6 still suffers the high handoff delay and the large packet lost. The protocol provides a new secure handover protocol to reduce handoff delay and packet lost with the assistance of relay nodes over LTE networks. In this paper, the authors consider the security issue when selecting relay nodes during the handoff procedure.
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