在有線-無線複合式網路利用延遲變異之壅塞控制機制增進資料流控制傳輸協定的效能

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姓名

王健任(Jian-Ren Wang) 查詢紙本館藏

畢業系所

資訊工程學系

論文名稱

在有線-無線複合式網路利用延遲變異之壅塞控制機制增進資料流控制傳輸協定的效能
(Jitter-based SCTP: Improving SCTP performance by jitter-based congestion control over wired-wireless networks)

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摘要(中)

隨著通訊技術的演進，無線網路在下一代網際網路中逐漸成為最受歡迎的通訊技術。現今的主機例如桌上型電腦以及行動裝置，可能都配備著多個有線或是無線的網路接取設備。近年來，Stream Control Transmission Protocol (SCTP) 被提出用來做可靠的資料傳輸協定，其multihoming的特徵可以有效使用主機上的多個網路接取設備來增進效能及可靠性。然而，就如TCP，SCTP同樣在有線-無線之異質性網路會遇到不必要的效能損失。其主因是因為SCTP的壅塞管理機制無法判別封包遺失的原因，以至於不恰當的降低壅塞窗口。為了解決上述問題來增進效能，我們提出一個應用於有線-無線網路中以延遲變異為基礎、並且擁有點對點特性的壅塞控制機制來增進效能，另外，我們加強延遲變異為基礎的封包遺失判別方針，使整體方法更加強健。此外還整合了預測可利用頻寬的機制，穩定傳輸時的瓶頸流量，實驗結果顯露出我們提出的方法JSCTP的確可以在異質性網路下有效地使效能顯著的提升。

摘要(英)

With the evolution of communication networks, wireless networks gradually become the most adaptive communication networks in next generation internet. Desktops and mobile devices may be equipped with multiple wired and/or wireless network interfaces. Stream Control Transmission Protocol (SCTP) has been proposed for reliable data transport and its multihoming feature makes use of network interfaces effectively to improve performance and reliability. However, like TCP, SCTP suffers unnecessary performance degradation over wired-wireless heterogeneous networks. The main reason is that original congestion control scheme of SCTP cannot differentiate loss events so that SCTP reduces the congestion window inappropriately. In order to solve this problem and improve performance, we propose a jitter-based congestion control scheme with end-to-end semantics over wired-wireless networks. Besides, we amend decision policy of jitter ratio loss distinction to make it more correctness and robustness. Available bandwidth estimation scheme will be integrated into our congestion control mechanism to make the bottleneck more stabilized. Simulation experiments reveal that our scheme (JSCTP) gives prominence to improve performance effectively over wired-wireless networks.

關鍵字(中)

★ 無線網路
★ 延遲變異
★ 端對端壅塞控制
★ 資料流控制傳輸協定
★ 封包遺失判斷
★ 頻寬估計

關鍵字(英)

★ stream control transmission protocol (SCTP)
★ jitter
★ wireless
★ bandwidth estimation
★ loss differentiation
★ end-to-end congestion control

論文目次

Chapter 1. Introduction 1
1-1. SCTP BackGround 1
1-2. SCTP congestion control over wireless link 3
1-3. Contribution of the thesis 4
1-4. Thesis organization 5
Chapter 2. Related Work 6
2-1. Wireless enhancement on SCTP 6
2-1-1. Collaborative SCTP 7
2-1-2. ECN-D SCTP 8
2-1-3. WiSE 10
2-2. Wireless enhancement on TCP end-to-end approaches 12
2-2-1. TCP Vegas and TCP Veno 12
2-2-2. TCP Jersey 14
2-2-3. JTCP 15
Chapter 3. JSCTP 20
3-1. Jitter-based loss differentiation scheme over SCTP 20
3-1-1. Collect samples of inter-arrival jitter 20
3-1-2. Independent jitter ratio for different path 23
3-1-3. Decision rule for loss differentiation 23
3-1-4. Ineffective jitter ratio problem 25
3-2. Congestion control policy of JSCTP 28
3-2-1. Rate-based congestion control 28
3-2-2. Operation of JSCTP congestion control 29
Chapter 4. Simulation Results 33
4-1. Comparion of different JSCTP parameter settings 35
4-2. Wireless SCTP throughput comparison 37
4-3. Inter-protocol Fairness 41
4-4. TCP-Friendly 43
Chapter 5. Conclusions and Future works 46
References 48

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指導教授

吳曉光(Eric Hsiao-Kuang Wu)

審核日期

2006-7-23

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