隨著無線網路技術的不斷精進，與無所不在的網路環境願景，IETP早已經訂定Mobile IP[1][2]的通訊協定來解決因Mobile Node的移動造成IP層連線中斷的問題。為了因應將來的移動裝置不只是單單的Node移動，也可能伴隨一整個Network的移動，IETF的NEMO(NEtwork MObility) Working Group[3]正在討論這樣的問題。在NEMO Working Group所提供的NEMO Basic Support[4]中，存在著許多缺點。例如Ping Pong Routing，Tunnel Header Overhead，Handover Delay，造成網路連線品質的不佳。
在傳統討論Host Mobility議題當中，Micro-Mobility Protocol[21][22][23][24][25] [26]被認為用來解決Handover Delay的有效方法。Micro-Mobility Protocol利用Domain的架構將Binding Update的次數減到最低。我們利用這樣的Domain概念，提出了新的Network Mobility Protocol，VIPv6，且相容於Host Mobility Protocol。並且再與另一個Domain架構的方法HMIPv6比較，分析效能的差異。
VIPv6讓在封包傳送路徑上的每個router紀錄所有底下每個MN和MR的domain care-of address以及遞送方向，讓每個router皆有得知目前網路連結狀況的能力。而HMIPv6的方法僅將網路連結狀況紀錄在MAP的一個Gateway上。
分析結果顯示，我們進一步的改善在Domain內的封包遞送延遲，並且減少遞送所需要的Tunnel層數，間接改善頻寬的使用效率。另外，我們散佈封包遞送的查詢紀錄，將進一步的減少封包因查詢所造成的延遲。

[1] IETF MIP4 working group, http://www.ietf.org/html.charters/mip4-charter.html
[2] IETF MIP6 working group, http://www.ietf.org/html.charters/mip6-charter.html
[3] IETF NEMO working group, http://www.ietf.org/html.charters/nemo-charter.html
[4] V. Devarapalli, R. Wakikawa, and A. Petrescu," Network Mobility (NEMO) Basic Support Protocol", RFC3969, January 2005.
[5] D. Johnson, C. Perkins, and J. Arkko, "Mobility Support in IPv6," RFC3775, June 2004.
[6] E. Perera, R. Hsieh, and A. Seneviratne, "Extended Network Mobility Support," (draft-perera-nemo-extended-00.txt), Internet Draft, IETF, July 2003, Work in Progress.
[7] K. Lee, J. Jeong, J. Park, and H. Kim, "Route Optimization for Mobile Nodes in Mobile Network based on Prefix Delegation," (draft-leekj-nemo-ro-pd-02.txt), IETF, Internet Draft, February 2004, Work in Progress.
[8] K. Lee, J. Park, and H. Kim, "Route Optimization for Mobile Nodes in Mobile Network based on Prefix Delegation," IEEE Vehicular Technology Conference, vol. 3, pp. 2035-2038, 2003.
[9] J. Na, S. Cho, C. Kim, S. Lee, H. Kang, and C. Koo, "Secure Nested Tunnels Optimization using Nested Path Information," (draft-na-nemo-nested-path-info-00.txt), Internet Draft, IETF, September 2003, Work in Progress.
[10] J. Na, S. Cho, C. Kim, S. Lee, H. Kang, and C. Koo, "Route Optimization Scheme based on Path Control Header, " (draft-na-nemo-path-control-header-00.txt), IETF, Internet Draft, April 2004, Work in Progress.
[11] P. Thubert and M. Molteni, "IPv6 Reverse Routing Header and its application to Mobile Networks," (draft-thubert-nemo-reverse-routing-header-05.txt), IETF, Internet Draft, June 2004, Work in Progress.
[12] R. Wakikawa and M. Watari, "Optimized Route Cache Protocol (ORC)," (draft-wakikawa-nemo-orc-00.txt), IETF, Internet Draft, July 2004, Work in Progress.
[13] R. Wakikawa, S. Koshiba, K. Uehara, and J. Murai, "ORC:Optimized Route Cache Management Protocol for Network Mobility,"International Conference on Telecommunications, vol. 2, pp. 1194-1200, 2003.
[14] C. Ng and J. Hirano, "Securing Nested Tunnels Optimization with Access Router Option," (draft-ng-nemo-access-router-option-01.txt), IETF, Internet Draft, July 2004, Work in Progress.
[15] H. Cho, E. K. Paik, and Y. Choi, "R-BU : Recursive Binding Update for Route Optimization in Nested Mobile Networks,"IEEE Vehicular Technology Conference , vol. 3, pp. 2063-2067, 2003.
[16] J. Jeong, K. Lee, J. Park, and H. Kim, "ND-Proxy based Route and DNS Optimizations for Mobile Nodes in Mobile Network," (draft-jeong-nemo-ro-ndproxy-02.txt), IETF, Internet Draft, February 2004, Work in Progress.
[17] J. Jeong, K. Lee, J. Park, and H. Kim, "Route Optimization based on ND-Proxy for Mobile Nodes in IPv6 Mobile Networks," IEEE Vehicular Technology Conference , vol. 5, pp. 2461-2465, 2004.
[18] T. Narten, E. Nordmark, and W. Simpson, "Neighbor Discovery for IP Version 6 (IPv6)," RFC2461, December 1998.
[19] S. Thomson and T. Narten, "IPv6 Stateless Address Autoconfiguration," RFC2462, December 1998.
[20] H. Kang, K. Kim, S. Han, K. Lee, and J. Park, "Route Optimization for Mobile Network by Using Bi-directional Between Home Agent and Top Level Mobile Router," (draft-hkang-nemo-ro-tlmr-00.txt), IETF, Internet Draft, June 2003, Work in Progress.
[21] A. T. Campbell and J. Gomez, "An Overview of Cellular IP", IEEE Wireless Communications and Networking Conference, vol. 2, pp. 606-610, 1999.
[22] R. Ramjee, K. Varadhan, L. Salgarelli, Sandra R. Thuel, Shie-Yuan Wang, and Thomas La Porta, "HAWAII:A Domain-Based Approach for Supporting Mobility in Wide-Area Wireless Networks", IEEE/ACM Transactions on Networking, vol. 10, pp. 396-410, June 2002.
[23] H. Soliman, C. Catelluccia, K. E. Malki, and L. Bellier, "Hierarchical Mobile IPv6 mobility management (HMIPv6)," (draft-ietf-mipshop-hmipv6-04.txt), IETF, Internet Draft, December 2004, Work in Progress.
[24] A. T. Campbell and J. Gomez, "IP micro-mobility protocols", ACM SIGMOBILE Mobile Computing and Communications Review, vol. 4, pp. 45-53, October 2000.
[25] A. T. Campbell, J. Gomez, S. Kim, C.-Y. Wan, Z. R. Turanyi, and A. G. Valko, "Comparison of IP micromobility protocols", IEEE Wireless Communications, vol. 9, pp. 72-82, February 2002.
[26] L. Cerda, F. Vena, and O. Casals, "Study of the TCP Dynamics over Wireless Networks with Micromobility Support Using the ns Simulator", ACM Wireless Networks, vol. 10, pp. 17-27, January 2004.
[27] H. Ohnishi, K. Sakitani, and Y. Takagi, "HMIP based Route optimization method in a mobile network," (draft-ohnishi-nemo-ro-hmip-00.txt), IETF, Internet Draft, October 2003, Work in Progress.
[28] T. Oiwa, M. Kunishi, M. Ishiyama, M. Kohno and F. Teraoka, "A network mobility protocol based on LIN6", IEEE Vehicular Technology Conference, vol.3 , pp. 1984-1988, 2003.
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[30] S. K. Bose, An introduction to queueing systems, Plenum US, 2002.