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系統識別號 U0026-1112200923224200
論文名稱(中文) 優先重覆位址偵測機制於FMIPv6之改善
論文名稱(英文) Improved aDAD Mechanism in Fast Mobile IPv6 implementation
校院名稱 成功大學
系所名稱(中) 電信管理研究所
系所名稱(英) Institute of Telecommunications and Management
學年度 98
學期 1
出版年 99
研究生(中文) 黃俊維
研究生(英文) Jun-Wei Huang
學號 R9696109
學位類別 碩士
語文別 中文
論文頁數 47頁
口試委員 口試委員-林福林
口試委員-林易泉
指導教授-陳文字
口試委員-胡守任
中文關鍵字 行動式IP  預先重覆位址偵測  換手延遲 
英文關鍵字 Mobile IP  NS2  DAD  aDAD  IPv6 
學科別分類
中文摘要 隨著無線通訊的服務近年來越來越受到注目,使用者對於即時應用的需求也隨著蓬勃成長。然而,行動網路要達到廣泛的應用依然有許多技術問題需要克服。在IP網路中,封包係透過IP位址來轉送到目的地,這個特性使得使用者在行動網路中漫遊時,會因為IP位址的改變而形成某些換手(handover)上的問題,特別是換手的延遲(handover latency)。
行動IP (Mobile IP)即是設計來解決此類的問題。然而IPv6為避免IP位址衝突,會進行重覆位址偵測(duplicate address detection, DAD)的機制,而這項動作花費的時間,這對許多即時性的應用而言,將會造成嚴重的延遲現象。為了縮短MIPv6應用在換手時的延遲,有專家提出預先重覆位址偵測(advanced DAD, aDAD)之技術,能夠省略了重覆位址偵測的步驟,進而大幅減少了IPv6在換手上的延遲。
本研究目的在於改進aDAD的換手協定,主要是減少移動節點在提出換手要求後,換手訊息在基地台之間傳遞與處理的時間,如此一來,待移動節點提出換手的要求後,即可以更快地得到能夠在下一個子網路使用的IP位址。
研究將利用Network Simulator version2 (NS2)程式來進行新協定的模擬,並針對換手延遲、連線的吞吐量(throughput)等評量指標,來比較本研究所提出之協定與原始預先重覆位址偵測在換手延遲的差別。
英文摘要 While wireless technology is more and more popular nowadays, there are still some technical obstacles that must be overcome before mobile networking can become wide-spread.
Mobile IP technology is used to maintain users’ network connections when mobile hosts are traveling between different subnetworks. However, in order to avoid the address collisions, MIPv6 must perform the address duplicate detection (DAD). The DAD procedure is defined in RFC 3775 standard and is a time-consuming task. Although techniques such as advanced DAD (aDAD) and optimistic DAD (oDAD) have improved this latency, both methods have limitations.
In this thesis, we enhance aDAD handover protocol by reducing the delay while handover messages are exchanged between base stations. Therefore, mobile users can immediately receive responds from serving-router after they make their requests to handover to new subnetworks.
We use the “Network Simulator version 2” to evaluate the performance of the proposed mechanism. Furthermore, we set up different simulation scenario to compare the handover performance of our mechanism in this thesis with the ordinary aDAD handover strategy.
論文目次 Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivation and Objective 3
Chapter 2 Literature Review 5
2.1 Mobile IP 5
2.1.1 Mobile Networking Terminology 5
2.1.2 IP Packet Delivery 6
2.1.3 Comparison of Mobile IPv6 and Mobile IPv4 8
2.2 Enhanced Mobile IP Technology 10
2.2.1 Fast Mobile IP 10
2.2.2 Hierarchical Mobile IP 12
2.3 Handover Latency of the MIPv6 14
2.3.1 Duplicate Address Detection (DAD) 15
2.3.2 Fast Address-Acquisition Methods 16
Chapter 3 Methodology 20
3.1 The improved aDAD scheme 20
3.2 Performance evaluation 23
3.2.1 Handover Latency 23
3.2.2 Congestion Window Size 23
3.2.3 Variation in Queue Length 24
3.2.4 Throughput 24
3.2.5 Maximum Moving Speed 25
3.3 Network Simulator Version 2 27
3.4 Simulation Scenario 28
Chapter 4 Simulation Results 29
4.1 Reliable Data stream and Mobile Receiver 29
4.2 Unreliable Data Stream and Mobile Receiver 34
4.3 Robustness Analysis 38
4.4 Pressure Tests for Moving Speed 42
Chapter 5 Conclusion and Recommendations 44
References 46
參考文獻 [1] C. Perkins, IP Mobility Support. RFC 2002, October 1996.
[2] R. Koodli, Ed., Fast Handovers for Mobile IPv6. RFC 4068, July 2005.
[3] H. Soliman, C. Castelluccia, K. El Malki, and L. Bellier, Hierarchical Mobile IPv6 Mobility Management (HMIPv6). RFC 4140, August 2005.
[4] D. Johnson, C. Perkins, and J. Arkko, Mobility Support in IPv6. RFC 3775, June 2004.
[5] Y. H. Han and S. H. Hwang, “Care-of address provisioning for efficient IPv6 mobility support,” Elsevier Computer Communications Journal, vol. 29, pp. 1422-1432, 2006.
[6] N. Moore, Optimistic Duplicate Address Detection (DAD) for IPv6. RFC 2462, April 2006
[7] The ns Manual, http://nsnam.isi.edu/nsnam/index.php, May 2007.
[8] VINT project, http://www.isi.edu/nsnam/vint/
[9] L. M. Hsu, P. Bo and Y. Jau, “NS and network simulation”, Posts and Telecom Press, 2003.
[10] C. H. Ke, R. S. Cheng, S. K. Shie and W. S. Huang, “Computer Network Experiments---Using NS2”, Xbook Marketing, 2005.
[11] C. H. Ke, “Computer Network Experiments---Using NS2 to simulate wirelss network and multimedia communication”, Xbook Marketing, 2007.
[12] S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6) Specification, December 1998.
[13] A. T. Campbell, et al., "Comparison of IP Micro-Mobility Protocols", IEEE Wireless Communications Magazine, Vol. 9, No. 1, February 2002.
[14] C. C. Tseng, Y. C. Wong, L. H. Yen, K. C. Hsu, “Proactive DAD: A Fast Address-Acquisition Strategy for Mobile IPv6 Networks,” IEEE Internet Computing, vol. 10, pp. 50-55, November 2006.
[15] S. Yoon, J. Jeong, C. K. Kim, W. J. Yang, T. I. Kim, H. W. Jung, “New Approach for Reducing DAD delay using Link Layer Assistance in Mobile IPv6,” in Multimedia and Ubiquitous Engineering International Conference, 2007, pp. 1080-1085.
[16] S. Thomson, T. Narten, IPv6 Stateless Address Autoconfiguration. RFC 4429, December 1998.
[17] Y. Han, J. Choi and H. Jang, Advance Duplicate Address Detection, Internet Draft, Dec 2003, expired.
[18] N. B. Yoma, C. Busso and I. Soto, “Packet-loss modeling in IP networks with state-duration constraints,” IEE Proceedings Communications, Vol. 152, No. 1, February 2005.
[19] W. Stevens, TCP Slow Start, Congestion Avoidance, Fast Retransmit. RFC 2001, January 1997.
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