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研究生:劉崇汎
研究生(外文):Chung-Fann Liu
論文名稱:網路整合之研究與可靠行動通訊之建立
論文名稱(外文):The Study of Network Integration and the Construction of a Reliable Mobile Communication Environment
指導教授:陳祈男陳祈男引用關係
指導教授(外文):Chyi-Nan Chen
學位類別:博士
校院名稱:國立成功大學
系所名稱:工程科學系碩博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:105
中文關鍵詞:網路整合容錯SAGCoM漫遊網際網路行動通訊
外文關鍵詞:InternetRoamingSAGCoMMobile CommunicationNetwork IntegrationFault-Tolerant
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  • 被引用被引用:1
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  • 下載下載:318
  • 收藏至我的研究室書目清單書目收藏:1
  一個行動通訊網路必須能夠滿足目前許多使用者多樣化的無線數位行動通訊的需求。如何把無線區域網路與網際網路整合是一個相當大的挑戰。在本篇論文中,我們提出一個以滑動代理器群組通訊模式(Sliding-Agent-Group Communication Model, SAGCoM)來支援建立一個在網際網路上多形(Multi-tiers)容錯漫遊的環境。一般來說,網路的整合方式有兩大研究方向:All-IP approach跟application layer approach。All-IP approach是一個相當不錯的整合方式,但是他要求所有的網路必須是IP為基礎的網路,這樣的限制使得他在整合現有非IP基礎的網路時顯得格外的困難。而Application layer approach在整合不同的網路時則相對的非常簡單。由於所有的環境都是架設在應用層之上,因此不論是開發、測試、維護等各方面都相對簡單許多。除此之外,他還可以很容易的重新調整或修改系統的行為運作模式。
  SAGCoM是屬於Application layer approach的一種。他是一個以代理器以及群組通訊為基礎的通訊模式。由於採用了代理器,使得兩的相連結的網路得以分離,避免一方的錯誤干擾蔓延到另一方,此外也簡化了不同網路間的整合。而群組通訊則是提供了較高的容錯能力,使得整個環境不會因為單一的軟體或是硬體的錯誤而中斷,因而能夠持續提供通訊服務。此外,這個通訊模式同時還能提供不同通訊設備間的切換,對於使用者來說完全不需要擔心設備間的切換,各個通訊設備或網路因此可以交替互補的使用。
  在本論文中除了探討與說明了SAGCoM的觀念、架構、運作模式、容錯方式以及他的效能分析與量測之外,一個雛型系統的設計方式,各個模組的架構、演算法、功能描述也已詳細說明。最後,這個雛型系統的測試方式與結果也會一並討論。
  Mobile networking technology supports the requirements of contemporary Internet users as they roam about with sophisticated mobile computers and digital wireless data communication devices. Integrating wireless networks into the global Internet poses a new challenge. In this dissertation, a model called SAGCoM (Sliding-Agent Group Communication Model) is proposed to integrate different networks and to construct a robust multi-adapter roaming environment over Internet. The study of network Integration can be classified into two categories: All-IP approach and application layer approach. All-IP approach is a good way to integrate networks, but it requires that the network must be an IP-based network. This limitation makes it need more efforts to integrate existing networks without IP protocol support. On the other hand, it is much easier to integrate networks in application layer. The whole environment can be implemented, tested and maintained much easier. It is very easy to configure and modify the behavior of the system.
  SAGCoM, one of the application layer approaches, is based on the concept of agent and group communication. The concept of agent reduces the coupling of two connected individual networks, so the error occurring within a network will not propagate to the other one. The operation of different communication adapters (also called tiers) can also be easily integrated through the operation of the agent. The group communication provides the ability of error recovery when one of the components, either hardware or software, crashes. The integration of the operation of different adapters make mobile host use the adapters in a complementary way, i.e., the adapters can be used interchangeably, but transparent to the user. Subsequently, the building of a seamless roaming environment becomes easier.
  The dissertation manifests the features of SAGCoM, i.e., the concept, the operational model, the architecture, the fault tolerance, and the performance. The implementation of a prototype system is also described. The architecture, algorithms and functions of each component are described as well. Finally, some testing results of this prototype system are shown and discussed.
ACKNOWLEDGEMENT 1
中文摘要 2
ABSTRACT 3
CONTENTS 5
LIST OF FIGURE 9
NOTATION 11
1. INTRODUCTION 12
2. RELATED WORK 15
2.1 MOBILE IP 15
2.1.1 Route Optimization Scheme 16
2.1.2 Hierarchical Foreign Agent Management Scheme 17
2.1.3 Anchor Chain Scheme 19
2.1.4 Point Forwarding for Location Tracking and Multi- tunneling in Handoff 20
2.1.4.1 Packet Delivery and Handoffs 22
2.1.4.2 Pointer Update and the Lifetime Threshold 24
2.1.4.2 Multi-tunneling Threshold in Handoffs 25
2.2 MOBILE IPV6 27
2.2.1 Route Optimization 28
2.2.2 Binding Management 29
2.2.3 Movement Detection 30
2.2.4 Home Agent Discovery Mechanism 30
2.3 GSM 31
2.4 IMT-2000 34
2.5 ALL-IP NETWORK 35
2.6 MOBILE AGENT 36
2.7 GROUP COMMUNICATION 37
3. NETWORK INTEGRATION 40
3.1 ALL_IP APPROACH 41
3.2 APPLICATION LAYER APPROACH 42
4. THE DESIGN OF A RELIABLE COMMUNICATION ENVIRONMENT 44
4.1 THE PROBLEMS 44
4.2 THE REQUIREMENTS 45
4.3 THE CONECPTS OF SAGCOM 47
4.4 THE DESIGN ISSUES OF SAGCOM 50
4.5 THE STRUCTURE OF SAGCOM 55
4.6 THE COMPONENTS 56
5. MOBILITY MANAGEMENT AND FAULT-TOLERANT PROTOCOLS 58
5.1 REGISTRATION 58
5.2 BS HAND-OFF 59
5.3 TIER HAND-OFF 61
5.4 LOCATION TRACKING 62
5.5 ERROR DETECTION AND RECOVERY 63
5.5.1 Error Detection 64
5.5.2 Error recovery 65
6. SYSTEM ANALYSIS 68
6.1 PERFORMANCE 70
6.1.1 Handoff 70
6.1.2 Location Tracking 72
6.1.3 Message Forwarding 73
6.2 RELIABILITY 75
6.3 DISCUSSION 78
7. IMPLEMENTATION 79
7.1 PACKET FORMAT 79
7.2 THE PROTOCOL BETWEEN COMPONENTS 81
7.3 THE DETAIL OF COMPONENTS 81
7.3.1 The MH Daemon 81
7.3.2 The BS Daemon 85
7.3.3 The Agent 87
7.3.4 The Tier Adapter 90
7.4 TEST 91
7.4.1 Testing Environment 91
7.4.2 Testing Result 92
7.5 DISCUSSION 93
8. CONCLUSIONS AND FUTURE WORK 95
8.1 SUMMARY 95
8.2 FUTURE WORK 96
REFERENCE 98
APPENDIX-A 101
APPENDIX-B 103
CURRICULUM VITAE 105
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