臺灣博碩士論文加值系統

近年來，為因應現今的輕巧裝置和使用者習慣的改變，電腦網路的移動性越來越受到重視。目前有許許多多的研究是針對縮短接續程序所造成的延遲。這些研究當中，絕大多數致力於維持當行動節點跨越不同網域時與對應結點間的連線。這樣的策略在某一些應用上是不恰當的，例如同質性分散式系統。
在這篇論文中，提出一個包含任意播放和服務轉移的全新接續方法。在我們所提出的方法中，當一個行動節點進入新的網域時，我們利用任意播放協定來定位出一個新的最近伺服器，並且將正在接受的服務自動從較遠的伺服器轉移到距離使用者較近的新伺服器來。結果顯示，服務轉移可以提升服務品質以及改善頻寬使用，不論是對服務本身，或是整體網路環境，都能因此獲得好處。

In response to the presence of portable devices and the change in usage patterns, mobility support for computer networking has received increasing attentions in recent years. There has been wide variety of established works focusing on the shortening of the handover delay. Most of them had tried their best in maintaining the connections to their peer nodes as mobile nodes moving across different network domains. This might not be a best policy in certain applications, such as homogeneous content distribution systems.
A new handover scheme incorporating anycasting and service migration is developed and presented in this thesis. In the proposed approach, anycast is used to locate a new nearest server as a mobile node entering a new domain, and an ongoing service will be dynamically migrated from a distant server to a new server with shorter weighted network distance to the client. As a result, the individual service connection, as well as the global network environment, will benefit from the service migration, in terms of improved service quality and bandwidth utilization.

第一章 簡介 5
第二章 相關研究 7
2.1 名詞介紹 7
2.2 接續管理 (HANDOVER MANAGEMENT) 8
2.2.1 第二層觸發機制 9
2.2.2 快速接續協定 10
2.3 行程轉移 (PROCESS MIGRATION ) 12
2.4 ANYCAST 19
2.4.1 Anycast、Multicast與Unicast之比較 19
第三章 連線轉移之快速接續程序 24
3.1 方法簡介 24
3.2 核心機制 27
3.2.1 快速接續程序 27
3.2.2 轉移決策 (Migration Policy) 30
3.2.3 轉移機制 31
第四章 分析與模擬 36
4.1 使用新舊伺服器之效能比較 36
4.1.1 伺服器到使用者間距離對RTT之影響 36
4.1.2 伺服器到使用者間距離對傳輸速度的影響 41
4.2 實作連線轉移機制 44
4.3 降低網路負載之分析 47
第五章 結論 48
參考文獻 50

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