Design And Implement Of Mobile IPv4 Extended Protocol(HMIPv4+PMIPv4)

Nowadays, with the rapid widespread of Internet and profound developments on new technologies like broadband and wireless communications technologies, it is becoming an imminent trend that emerging communication techniques should be able to provide users with more advanced multimedia service including voice and video images onto their mobile devices. The demands to be able to access Internet with high flexibility with fewer spatial and temporal limitations are becoming more and more urgent. Furthermore, it is also a general demand for network to be capable of supporting more advanced multimedia features such as live multimedia, high mobility, and various network access methods which include wireless, cable, Internet and/or combination of different ways together.Besides detailed analysis of mobile IPv4 technology, the authors in this paper also analyze the main problems existing in current mobile IPv4 (MIPv4) techniques to meet the needs of future advanced multimedia network, while providing some potential solutions to the problems of high time delay between handovers in current MIPv4 technique and problems like how to remove complicity in Mobile Nodes (MNs) in developing mobile service software.On one hand, a more sophisticated hierarchical MIPv4 is adopted in this paper to solve the problem of high time delay during handovers by adding an extra GFA (Gateway Foreign Agent) entity layer to the original MIPv4 layers. When real-time handovers are needed, GFA can deal with coming registration requests to decrease time delay by reducing transition time of re-establishment between GFA and HA (Host Agent). By smart design and careful implementation of hierarchical MIPv4 combined with relevant robustness tests, we arrive at the conclusion that hierarchical MIPv4 can significantly reduce time delay during, which in turn increases reliability of the network. We also performed comparisons between our hierarchical MIPv4 and traditional MIPv4, and we find hierarchical MIPv4 simplifies the structure of routering, decreases the the number of message handovers, and increases the efficiency of general network handovers.On the other hand, regarding the general mobility support and security concerns, the paper proposes a PMIPv4 (Proxy MIPv4) solution under the WLAN environment. In PMIPv4 solution, PMA (Proxy Mobile Agent) can send registration requests to HA instead of MNs to simplify the complicity of original MNs, which can also lessen the needs for an additional MIP software to reconnect to wireless network after relocation. Furthermore, the proposed PMIPv4 solution can verify the validity of MNs by verifying the implementation of multiple servers. After carefully designing PMIPv4 implementation, we have already obtained a basic frame in which all fundamental features are achieved to satisfy the needs for MIPv4. The authors would expect to a better platform could be established for future MIPv4 research by successfully carrying out the proposed PMIPv4 solution.This paper is supported by the grant from China National Development and Reform Commission under the project "Research on Integrated Services of Internet and Mobile Communications".