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研究生:林柏豪
研究生(外文):Bo-hao Lin
論文名稱:MIP環境下經由預先設定路徑以達到快速換手功能的通訊協定
論文名稱(外文):A Pre-Setup-Path for Fast Handoff in Mobile IP
指導教授:賴威光賴威光引用關係
指導教授(外文):Wei-kuang Lai
學位類別:碩士
校院名稱:國立中山大學
系所名稱:資訊工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:40
中文關鍵詞:行動網際網路通訊協定路由最佳化預先路徑設定換手三角傳輸
外文關鍵詞:Route OptimizationMobile IPPre-Setup-PathHandoffTriangular Routing
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隨著無線網路的蓬勃發展與越來越多行動設備的出現,行動計算儼然成為一個重要的研究領域。如何在原有的IP架構下,使網路上的行動通訊設備能夠利用IP通訊協定來與Internet做溝通,已變成越來越重要的課題。因為就我們所知,原有的IP協定架構在有線網路上面,在無線環境下不一定適用。由IETF所提出的Mobile IP,藉由Home Agent tunnel封包給Foreign Agent的方法,來解決IP網路行動性上面的問題,使得上層的通訊協定感覺不出下層IP網路的移動性。然而,目前的Mobile IP仍有非對稱傳輸(triangular routing)與因為行動節點做換手(handoff)時所造成的傳輸延遲問題。在此篇論文中,我們提出一個新架構來解決上述的兩個問題。我們假設網路上的路由器(Home Agent、Foreign Agent、General Router)能夠裝載Mobile IP engine這樣的前置處理引擎,且搭配我們自行建立的Mobile IP Table,在IP封包進IP routing engine前,先經由Mobile IP engine來處理Mobile IP的註冊/更新程序,以及此封包的路由方向,再丟給IP routing engine來送。當網路上的路由器能做此更改時,每個欲跟Mobile Node做傳輸的Correspondent Node都會先做一個Path-Setup的動作來追蹤Mobile Node,並直接經由此Path來傳輸資料,這樣不只解決了三角傳輸的問題,更可經由這些預先設定好的路徑來降低因Mobile Node做換手(Handoff)時所造成的傳輸延遲。除此之外,我們使用重傳(Retransmission)與沖水(Flush)的機制來避免換手時的封包遺失與所謂的失序(Out-of-Order)問題。最後,我們把我們的方法與標準的Mobile IP做模擬與分析,發現我們不僅可以解決三角傳輸的問題,換手時所造成的傳輸延遲也有明顯的降低。
With recent growth in mobile components and advances in wireless communication technology, mobile computing is an increasingly important area of research. Enabling mobility in IP networks becomes more and more significant. Mobile IP is the only current means for offering seamless roaming to mobile computers in the Internet. It has recently progressed along the ladder to standardization within the Internet Engineering Task Force (IETF). However, Mobile IP suffers from so-called triangular-routing problem and packet loss due to handoff. In this paper, we propose a new architecture to solve these two problems noted above. We assume that network routers such as Home Agent、Foreign Agent、General Router can equip our Pre-Accessing Engine (Mobile IP Engine) to access IP packets before IP routing Engine. With our Mobile IP table established in Mobile IP Engine, we can set up a transmission path for each correspondent node (CN) to transmit data to mobile node (MN). Therefore, we not only solve triangular-routing problem by direct transmission path, but also decrease handoff latency from path updating function. Furthermore, we use retransmission and flush schemes to avoid packet loss and out-of-order problems. Finally, we use simulation to prove our architecture is useful.
I. 導論…1
1.1 Motivation…1
1.2 研究想法…3
II. Related Work…5
2.1 Mobile IP Overview…5
2.1.1相關的運作元件…7
Mobile Node(MN)…7
Home Agent(HA)…7
Foreign Agent(FA)…7
Correspondent Node(CN)…8
2.1.2 Mobile IP Functions…8
2.1.3 Mobile IP Operations…9
2.1.4 Mobile IP Process…11
Mobile Agent Discovery…11
Registration Request and Reply…11
Tunneling…12
Route Optimization…12
Smooth Handoffs…13
2.2 Hierarchical Foreign Agent…14
2.3 Movile IP所遭遇到的問題…15
III. The Proposed Scheme…16
3.1 Router Modification…16
3.2 The Packets that MIP Engine Access…18
3.3 Register/Update Process…20
3.4 Pre-Setup-Path…21
3.5 MIP Engine Process…24
3.5.1 Hit/Miss Process…24
3.5.2 Handoff Process…26
3.5.3 Path Update Process…27
IV. Simulation and Results…30
4.1 Simulation Model…30
4.2 Simulation Results…32
4.2.1 Standard Mobile IP…32
4.2.2 Route Optimization Mobile IP (ROMIP)…33
4.2.3 Pre-Setup-Path Mobile IP (PSP-MIP)…35
V. Conclusion…38
[1] I. F. Akyildiz, et al., “Mobility management in next-generation wireless systems,” Proceedings of the IEEE, vol. 87, No, 8, pp. 1347-1384, Aug.1999.
[2] C. E. Perkins, ed., “IPv4 Mobility Support,” RFC 2002, OCT. 1996.
[3] D. b. Johnson and C. E. Perkins, “Route Optimization in Mobile-IP,” draft-ietf-mobileip-optim-05.txt, Nov. 1996(work in progress).
[4] C. E. Perkins, Mobile IP: Design Principles and Practices, Addison-Wesley Longman, Reading, Mass., 1998.
[5] J. B. Postel, ed., “Transmission Control Protocol,” RFC 793, Sept. 1981.
[6] C. E. Perkins, C.E., Kuang-Yeh Wang, “Optimized Smooth Handoffs in Mobile IP”, IEEE International Symposium on Computers and Communications, 1999.
[7] E. Shim, H. Wei, Y. Chang, and R. D. gitlin, “Low latency handoff for wireless IP QOS with neighborcasting,” in Proc. of IEEE International conference on Communications (ICC2002), pp. 3245-3249, June 2002.
[8] K. El Malki et al., “Low Latency Handoffs in Mobile IPv4, “Internet draft, draft-ietf-mobileup-lowlatency-handoff-v4-03, work in progress, Nov. 2001.
[9] S. Ohzahata, S. Kimura, and Y. Ebihara, “A proposal of seamless handoff method for cellular internet environments,” IEICE Trans. on Commun., Vol. E84-B, No. 4, pp. 752-759, Apr. 2001.
[10] C. E. Perkins, “Mobile-IP Local Registration with Hierarchical Foreign Agents,” draft-perkins-mobileip-hierfa-00.txt, Feb. 1996(work in progress).
[11] S. Alexander and R. Droms, “DHCP Options and BOOTP Vendor Extensions,” RFC 1553, Oct. 1993
[12] S. E. Deering, ed., “ICMP Router Discovery Messages,” RFC 1256, Sept. 1991.
[13] C. E. Perkins, “IP encapsulation within IP,” Network Working Group, Request for comments 2003, October 1996.
[14] E. Gustafsson, A. Jonsson, and C. Perkins, “Mobile IP Region Registration,” Internet draft, draft-ietf-mobileip-reg-tunnel-03, work in progress, July2000.
[15] D. Lee, g. Hwand, and C. OH, “performance enhancement of Mobile IP by reducing out-of-sequence packets using priority scheduling”, IEICE Transaction Communication, August 2002, Vol E83-B, No 11, pp. 2501-2512.
[16] Perkins, C.E. “Mobile IP”, Communications Magazine, IEEE, Volume: 35, Issue: 5, May 1997.
[17] Z. Ren, C. Tham, C. Foo, and C. Ko, “Integration of Mobile IP and Multi-Protocol Label Switching”, ICC2001, June 2001.
[18] D. Johnson and C. Perkins, “Mobility Support in IPv6,” draft-ietf-mobileip-ipv6-03.txt, Nov. 1996(work in progress).
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