臺灣博碩士論文加值系統

IETF提出了Stream Control Transmission Protocol （SCTP），這個協定有高度的延展性與相容性，除了可以取代目前常用的TCP與UDP外，並且具有Mutli-stream與多宿（Mutli-homing）的特性，因此有許多針對SCTP在Handoff的研究，希望利用SCTP的特性來提高影音串流在WLAN與3G整合環境中傳送的效能。目前的SCTP雖然提供Mutli-stream的特性，可以將多個應用程式的影音串流綁定（Bundle）在一個關聯（Association）中傳送，但基於SCTP是以round robin循環的方式綁定不同串流的基本傳送單位區塊（Chunk），因此當同一個關聯中不同的串流針對接收的bit rate所提出的不同要求，就無法提供相符的服務品質，因此本論文提出了一個動態調整區塊大小的機制，使得每條影音串流在關聯中都能分配到適當的傳輸量，來達到不同的服務品質要求。另外，我們考慮到當Handoff到3G的過程中，為了避免Mutli-stream的特性，將使Handoff之後要求的頻寬變大，容易造成3G系統無法提供關聯所要求的頻寬給使用者，且又不能使用閒置的小頻寬頻道，使得系統的效能下降，我們將採取解除關聯（Deassociation）來解決這個問題。
為了驗証我們的機制，我們利用NS-2模擬器來建立WLAN與3G整合環境的拓墣並在這個環境下模擬Handoff的情況，然後觀察、量測與討論分析我們所提出的機制，與原來的SCTP比較後，使用我們的機制確實可以提升符合服務品質的要求，而且也可以提高在3G網路的使用率。

SCTP (Stream Control Transmission Protocol) was proposed by IETF. It shows superior extensibility and compatibility as compared to other transport layer protocols, such as TCP and UDP. In addition, it supports multi-streaming and multi-homing. Although an SCTP connection can convey many video streams from different applications, it lacks the provision of different QoS for different streams in the same association. On the other hand, more and more mobile devices are equipped with multiple network (e.g., UMTS/WLAN) interfaces to transmit packets over 3G cellular networks or wireless local area networks. This thesis presents a dynamic chunk adjustment scheme for SCTP-based video streaming in an integrated UMTS and WLAN network. The proposed scheme can support QoS guarantees for different streams in an SCTP association whenever a mobile node moves across the two networks or remains service by either network. Besides, when a mobile node roams from a WLAN to a UMTS, the proposed “deassociation” capability is applied to increase the channel utilization in 3G cellular networks. Performance evaluations on NS-2 are presented to demonstrate the effectiveness and the advantage of our proposed scheme over the original SCTP.

第一章 導論 1
1.1 研究動機 1
1.2 研究方向 2
1.3 章節介紹 3
第二章 SCTP 在3G 與WLAN 整合環境的介紹及相關研究 4
2.1 SCTP 簡介 5
2.2 Handoff Solution 相關問題研究 6
2.2.1 Mobile IP（MIP） 7
2.2.2 mSCTP 機制 8
2.3 無線與行動網路服務品質要求機制 10
2.3.1 WLAN 服務品質要求的機制 10
2.3.2 3G 服務品質要求的機制 11
2.3.3 WLAN/3G整合環境相關研究 13
2.4 WLAN/3G整合環境機制的比較 14
2.5 本論文的動態調整機制 15
第三章 SCTP 的動態調整 16
3.1 動態調整區塊大小機制 16
3.1.1 新增Chunk Adjustment 16
3.1.2 區塊大小的計算方式 17
3.2 SCTP 在3G 環境的Deassociation 23
3.3 運作流程 27
第四章 模擬與量測 30
4.1 NS 模組架構 30
4.2 模擬實驗架構與參數設定 33
4.2.1 網路拓墣 33
4.2.2 參數設定 33
4.3 模擬結果與分析討論 35
4.3.1 在WLAN 與3G 下動態調整 36
4.3.2 3G Admission Control 與Deassociation 39
第五章 結論與未來工作的方向 46
5.1 結論 46
5.2 未來工作 47
REFERENCE 48
索引(Index 52
附錄 57

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[17]Mi Kyoung Kim, Kiho Nam, Jaeki Lee, and Hwang-Soo Lee, “A Case Study of Policy-based QoS Management in 3G Networks,” The 57th IEEE Semiannual Vehicular Technology Conference, Jeju, Korea, Volume 4, pp.2755 - 2759, April 2003.
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[20]Eero Wallenius, Timo Hämäläinen, Timo Nihtilä, Jyrki Joutsensalo, and Kari Luostarinen, “3G Interworking with WLAN QoS 802.11e,” IEEE 58th Vehicular Technology Conference, Orlando, USA, Volume 3, pp.1803 – 1806, Oct. 2003.
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[23]R.Stewart, M. Ramalho, Q. Xie, M. Tuexen, and P. Conrad, “SCTP Partial Reliability Extension,” IETF RFC 3758, May 2004.
[24]The Network Simulator – ns2. http://www.isi.edu/nsnam/ns/.
[25]UMTS Module http://www.ti-wmc.nl/eurane/.