臺灣博碩士論文加值系統

無線網路通常包含了一個主幹網路來連結各種無線通訊裝置，透過這個主幹網路的連結，行動式通訊器可以到處移動但仍維持通訊不中斷。我們的研究重點在探討行動式無線網際網路上行動管理的問題。行動式無線網際網路是一個無線的服務網路，他的核心網路是由網際網路路徑器所組成，而無線的存取網路則可以使用任何支援網際網路的無線電網路。在我們的研究中，我們將探討兩個與行動式無線網際網路相關的行動管理問題，首先我們討論行動式無線網際網路中，在無線網路部分因行動式通訊器移動位置所形成的換手問題；其次則是研究改進連結無線網路的主幹網路技術，使其能夠支援行動通訊的需求。
目前有兩種主要的通訊技術可以讓行動式無線網際網路使用：行動式網際網路通訊協定和無線區域網路。行動式網際網路通訊協定是以網際網路通訊協定為基礎來處理行動式通訊的問題，而無線區域網路則是提供在一區域內的無線通訊，通常這兩種技術都是在不同的網路層次互相獨立的運作，因此會有一些問題的產生，例如延遲換手、封包遺失和無效率的路徑。我們將這些問題定義清楚，分析發生的原因，並評估這些問題對網路效能所產生的影響，我們也提出一個新的智慧型換手方法來解決這些問題，這個新的方法主要是將行動式網際網路通訊協定與無線區域網路的換手方法加以擴充，讓兩種技術中所包含的資訊能夠互相交流，這樣的做法可以使不同網路層次共同運作來防止封包遺失以及減少換手延遲。
在行動式無線網際網路中，我們使用標籤交換式網路當成主幹網路來連結無線的存取網路，我們討論如何在標籤交換式網路支援行動式通訊。以簡單、有效率的標籤交換技術為基礎，我們設計了一個重找路徑的方法來將行動式網際網路資料流導向到最短的路徑，這個方法與現有的行動式網際網路通訊協定相容而且可以達到路徑最佳化，而網際網路資料流在標籤交換式網路上的傳輸也可以更有效率。

Wireless networks are usually composed of a wired backbone and
one or more hops connecting mobile hosts to the wired part.
Our research deals with the mobility management scheme for
Mobile Wireless InterNet (MWIN). MWIN is a wireless service
network wherein its core network consisting of Internet routers
and its access network can be built from any Internet-capable
radio network. In our research, we inspect two mobility
issues of MWIN. At first, we address the handoff problems in
the wireless part of MWIN. Next, we discuss the mobility support in the backbone networks which interconnect the wireless access networks.
Currently, two major standards are available for MWIN, i.e., the Mobile IP and wireless LAN. Mobile IP solves address mobility problem with the Internet protocol while wireless LAN provides a wireless Internet access in the local area.
However, these two schemes solve problems independently at different layers, thereby some additional problems occur, e.g., delayed handoff, packet loss, and inefficient routing. We will identify these new problems and performs analyses on the handoff within MWIN. Then, a new handoff architecture that extends the features of both mobile IP and wireless LAN handoff mechanism is proposed. This new architecture consists of Mobile IP extensions and a modified wireless LAN handoff algorithm. The effect of this enhancement provides a linkage between different layers for preventing packet loss and reducing handoff latency.
For the wired backbone network of MWIN, we consider to use the
label switching networks to connect the wireless access networks. We address the problems of adding mobility support to label switching networks. Based on the simple and efficient label switching technology, we design a rerouting scheme to redirect the IP flow into shortest path route to mobile nodes. This scheme is compatible with the existing IP and Mobile IP protocols. Using the proposed rerouting scheme, route optimization can be accomplished. Moreover, IP traffic transmitted through label switching networks experience less delay.

封面
中文論文
Coverr
Abstract
Acknowledgements
Contents
List of Figures
List of Tables
1. Introduction
1.1 Mobile Wireless Internet Architecture
1.2 Mobility Management in Mobile Wireless Internet
1.3 Backbone Networks for Wireless Internet
1.4 Outline of the Dissertation
2. Related Work
2.1 Mobile IP
2.2 Label Switching Networks
3. Intelligent Handoff for Mobile Wireless Internet
3.1 Movement Detection in Mobile IP
3.2 Some Problem with Mobile Wireless Networks
3.3 Analysis and Measurement
3.4 Intelligent Handoff Architecture
4. Mobility Support in Label Switching Networks
4.1 Rerouting Mechanism in Label Switching Networks
4.2 A Simple Crossover Switching Discovery Scheme
4.3 Optimal Reutes Rerouting
4.4 Flow Redirection at the Crossover Switch
4.5 An Example
4.6 Simulation and Comparison
5. Conclusions
A Implementing Mobile IP for Windows System
Bibliography

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