臺灣博碩士論文加值系統

Mobile IP是由網際網路工程工作小組(IETF)所提出的一個通訊協定，用來處理宏移動(Macro-mobility)無線網路與微移動(Micro-mobility)無線網路的IP變動問題。但是在微移動無線網路時頻繁的切換(Handoff)常導致大量的封包遺失。目前雖然已經有各種關於微移動的方案被提出，例如Cellular IP、Hawaii、Hierarchical Mobile IP，但是仍不能滿足現行服務的需求，因為這些機制在移動換手時還是會有明顯的封包遺失及切換延遲的問題存在。這些問題對許多即時影音服務而言是不能夠被接受的。
本論文中,我們應用現行移動IP的移動檢測機制 ,作為主要研究架構,並使用『主動預測切換』的方法來提出『鏈路預測換手機制』,將移動IP在無線網路切換時的作業時間降到最低，也減少了無線端切換時所產生的封包延遲。本論文使用模擬的方式來驗證所提出的機制，模擬結果顯示出此方案在切換處理時間方面都能夠優於Hierarchical mobile IP方案。

Mobile IP is an Internet Engineering Task Force (IETF) proposed standard communications protocol for supporting macro-mobility and micro-mobility in wireless networks. However, using Mobile IP for micro-mobility network leads to the frequently handoff, handoff delay, and heavy packet drops. Consequently, the complicated Mobile IP scheme is not adequate for micro-mobility. Cellular IP, Hawaii, Hierarchical Mobile IP, and many other proposals have been presented to cope with the problems of micro-mobility. Actuality, these methods still have some unfavorable conditions, like packet loss and long handoff delay, which are unacceptable in real-time applications services.
In this thesis, the motion examining mechanism of mobile IP is the main research focus. We utilize the link prediction to minimize the handoff processing time in wireless networks. The link predicted handoff solution can effectively reduce the handoff latency and guarantee the packet’s arriving in time. The results of our simulation show that the proposed mechanism is better than the Hierarchical Mobile IP management scheme.

摘要 I
ABSTRACT II
致謝 III
CONTENTS IV
LIST OF FIGURES VI
LIST OF TABLES VII
CHAPTER 1 Introduction 1
1-1 Research background 1
1-2 Research status of mobile IP 3
1-3 Main research contents of mobile IP 7
1-4 Main work and framework of this paper 9
CHAPTER 2 Handoff management schemes 12
2-1 Mobile IP related concepts and entity introduction 12
2-2 QoS theory and technology of mobile IP 15
2-3 Mobile detection scheme of existing mobile IP 22
2-4 Mobile IP handoff management under micro mobility situation 25
CHAPTER 3 Improvement plan analysis 37
3-1 Basic target and principle of improvement 37
3-2 The theory foundation of improvement plan 37
3-3 Hierarchical improvement scheme 43
CHAPTER 4 Simulation verification of handoff scheme under micro-mobility condition 54
4-1 OPNET modeling of mobile IP 54
4-2 TCP and its application protocol simulation under micro- mobility condition 60
4-3 Simulation process 62
4-4 Simulation result analysis 64
CHAPTER 5 Conclusions and Prospects 70
REFERENCES 74

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