| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 94 === For accessing various resources via mobile device anytime anywhere, the heterogeneous access technologies between wired and wireless networks have been developed and integrated actively. Such a heterogeneous network consists of different Application Service Providers (ASPs). Different ASPs on the heterogeneous wireless network need the demand for authentication while a mobile node roaming among these ASPs. Moreover, a mobile node will query for a new IP and then request to certificate and authenticate while initializing to handoff or roaming into a new mobile network that belongs to different ASP, which may bring long handoff delay and cause high packet loss rate. Real-time services, e.g., Voice over IP (VoIP) and video streaming suffer from long delay, and non-real-time connections, e.g., TCP connections, cause low transmission throughput while occurring timeout and high packet loss rate. Therefore, in this paper, we propose a hierarchical mobility management structure (FSSH) to achieve fast, seamless, secure handoff for mobile nodes roaming in heterogeneous wireless networks. The advantages of FSSH include: (1) Achieving the purposes of fast, secure, seamless handoff when they move between different sub-networks; (2) Reducing handoff delay and packet loss while roaming and reducing signaling overhead of integration of different mobility communication protocols; (3) Overcoming signaling control load caused by the NAT problem while mobile node uses SIP protocol for VoIP; and (4) Providing compatibility of the different ASP mobility network environments. Furthermore, the transport layer policies mechanism is adopted to guarantee the transmission quality of services for real-time and non-real-time connections and to provide transparently accessing remote resources while roaming among heterogeneous wireless networks. Numerical results demonstrate that FSSH outperforms other approaches in handoff delay and signaling cost. Meanwhile, FSSH provides fast and seamless handoff or roaming in heterogeneous wireless networks that belong to different ASPs. Finally, FSSH effectively reduces packet delay and packet loss due to secure authentication.
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