臺灣博碩士論文加值系統

本論文針對在傳統 Mobile IP 換手後，HA (Home Agent)、FA (Foreign Agent)、MN (Mobile Node) 之間只能建立一條隧道 (Tunnel) 進行資料傳輸的缺點做改進，提出了一套多重通道分流技術，建立起次要隧道 (Secondary Tunnel)來協助主要隧道 (Primary Tunnel)，讓主要隧道的路由處於高負載時，HA 能主動將影音串流分流到次要隧道，讓 MN 影音串流品質不會受到影響。
為了驗證本論文的機制，我們在實驗室中實作了以 Linux 為平台建立了支援多重隧道分流的 HA、FA 和 MN，並在 HA 上實作了 MPEG-4 影片串流封包過濾器，讓 HA 在偵測到主要隧道的 FA 處於高負載時，能將 MPEG-4 影片串流封包依不同的畫面類型分流到次要隧道，接收端 MN 再將主要隧道和次要隧道的影片串流合併後播放。最後論文設計了三項實驗，來分別測試我們自己撰寫的簡易 Mobile IP 換手、分流機制啟動後的 bit rate、與自動依負載狀況啟動不同程度的分流，來證實多重隧道對影片串流品質的改善。

Traditional Mobile IP supports only one tunnel between HA (Home Agent) and FA (Foreign Agent) for MN (Mobile Node) to transmit data from CN (Corresponding Node) to MN during handoff. To alleviate traffic load, in this Thesis, we propose a multiple-tunnel approach by setting up a secondary tunnel in addition to the primary tunnel. HA can split the video stream from the primary tunnel to the secondary tunnel when the former encounters high traffic load. Thus, quality of video stream from CN to MN can be guaranteed through the proposed multiple-tunnel schemes.
For the purpose of validation, we implement the multiple-tunnel schemes on Linux platform for HA, FA, and MN to support video stream splitting. Specifically, if HA detects that high system load occurs on FA, an MPEG-4 packet filter is activated on HA to split some portions of video packets from the primary tunnel to the secondary tunnel based on I/B/P frame types. Video receiver on MN can then successfully recover these two divided video packets and playback the complete stream smoothly.
Three experiments for validation are developed. They are (i) a simple Mobile IP handoff, (ii) Different bit rates to activate the stream splitting mechanism, and (iii) automatic adjustment of stream splitting according to system load. The experimental results have proved that the proposed multiple-tunnel schemes can substantially improve the quality of video streams.

第一章 導論 1
1.1 研究動機 1
1.2 研究方向與方法 1
1.3 章節介紹 3
第二章 多媒體串流品質的改進 4
2.1 多媒體串流的相關技術 4
2.1.1 MPEG-4 簡介 4
2.1.2 Mobile IP 簡介 5
2.2 影音串流品質的研究 7
2.3 本論文所提出的方法 10
第三章 多通道分流機制 11
3.1 拓樸架構介紹 11
3.2 機制流程與演算法 12
3.2.1 簡易 Mobile IP 換手機制 14
3.2.2 MPEG-4 Frame 的封包分類 16
3.2.3對 FA 作 Queue Length 的量測 19
3.2.4分流機制的演算法 19
第四章 實作結果與分析 21
4.1 Linux 平台上的實作 21
4.1.1 簡易 Mobile IP 的實作 21
4.1.2更改 IPv4 表頭目的地位址的模組實作 24
4.1.3辨認 MPEG-4 封包類型的實作 26
4.1.4量測 FA 佇列長度 (Queue Length) 的實作 27
4.1.5 影片壓縮 28
4.2 實驗拓樸架構 29
4.3 實驗結果與分析 31
4.3.1 移動換手實驗 32
4.3.2 影片分流實驗 33
4.3.3 影片分流實驗 37
第五章 結論與未來工作的方向 39
5.1 結論 39
5.2 實作經驗 40
5.3 未來工作 41
參考文獻 (REFERENCES) 42
同義字 (ACRONYMS) 46
索引 (INDEX) 47

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[33]mp4creator - http://mp4creator.sourceforge.net/
[34]iptables - http://www.netfilter.org/
[35]iperf - http://iperf.sourceforge.net/