平行TCP連線在多模網路下穩定性及提升效能之研究

Stable and Efficient Parallel TCP overMulti-mode Communications

張志欣(Chih-Hsin Chang)

指導教授 ： 鍾添曜

元智大學/資訊學院/資訊工程學系/碩士(2008年)

https://doi.org/10.6838/YZU.2008.00301

摘要

多模網路是下一代行動通訊系統主要特色之一，它主要描述一個行動通訊設備具有多個網路介面，而應用程式可以同時利用這些網路介面連接網路。因為TCP是普遍性最高的通訊協定，所以已經有許多學者在研究如何將TCP擴充到多模網路。此外，TCP在無線網路是無效率的，這是因為封包錯誤率太高所致。所以有人建議用平行TCP 連線以增加在無線網路的吞吐量。在單一路徑下已有許多研究去估計要用多少平行TCP連線。然而在有多個路徑且有可能分享共同瓶頸頻寬下仍然不知如何估計。我們利用協議賽局架構去解決這個問題，提出一個解決方案叫做MPTC：每個玩家都評估別人的影響程度，之後在以這些資訊去估計連線數量，最後若每個玩家都同意大家的協議，則執行此協議。模擬結果顯示MPTC可以穩定的估計最大TCP連線數目而達到合理的網路吞吐量。

關鍵字

多路徑 ； 平行TCP連線 ； 協議賽局架構

並列摘要

The next generation of mobile wireless system is expected to allow multimode terminal to simultaneously access multiple network for a variety of services with an appropriate quality of service. Since TCP is the most popular transport layer protocol in network, many studies proposed a mechanism to handle TCP over multiple paths. In addition, TCP over Wireless Network or Long Fat Network is underutilization of bandwidth and parallel TCP connection can full utility of bandwidth. A key challenge in parallel TCP is finding optimal number of connections. Although many researches have been proposed adjusting connection number algorithm to improve TCP throughput on single path, how to configure the number of TCP connection on multipath that may share a common bottleneck is still lacking. For solving above problem, we use Nash Bargaining Game framework to model parallel TCP connections over multiple paths and design a mechanism, called MPTC, to estimate the number of connection according to the effect of other paths. Simulation results show that MPTC can maintain stable and low number of TCP connection while achieving reasonable good transport throughput.

並列關鍵字

Multipath ； Parallel TCP Connections ； Nash Bargaining Game Framework.

參考文獻

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