- 學位論文
傳輸控制協定和網路模擬分析無線通訊數據信號
Analysis of Packet Signal with TCP Protocol and Network Simulator in Wireless Communication
摘要
本論文主要利用傳輸控制協定及網路模擬軟體研究數據封包在無線通訊網路上所遇到的問題，經由分析無線封包的屬性及修改現有傳輸控制協定，我們提出幾個新的作法企圖去改善封包傳輸的效能，並由網路模擬的結果得知，確實能達到我們所設計的目標。 此篇論文有三個研究步驟，首先，分析出有線及無線情況下封包傳輸的不同，由於封包延遲的原因，傳統有線傳輸控制協定的方法，並不適用於無線網路的傳輸。根據前面的結果得知，當無線通訊時我們提出不同的方式，將有線傳輸控制協定做修正以適合於無線傳輸。最後，運用網路模擬軟體模擬我們所提的機制，經由實驗結果驗證，修改傳統有線傳輸控制協定，確實能改善無線封包的傳輸效能。 在我們提出改善無線傳輸控制的機制中，本研究有兩個具體的貢獻，分別如下： (1) 當通訊品質不良的無線網路中，適度的切割更小的封包大小，確實能增進傳輸的成功機率。 (2)運用區別出網路擁塞或中斷的技術，在我們所提出的機制中，確實能增進傳統傳輸控制協定的效能。 由本片論文的研究結果得知我們所提出的方法，比較現存的有線傳輸控制協定在無線傳輸控制上的應用，確實有較好的效能。
並列摘要
This thesis investigates the problem of analysis of package signal with TCP (Transport Control Protocol) protocol and network simulator for wireless communication. Via analyzing properties of wireless packages and modifying the existent TCP protocol, an attempt to improve the efficiency of package transaction is proposed by the authors. The simulation results based on NS-2 (Network Simulator version 2) tells us that the designed goals can be reached by this proposal. There are three steps in our proposal. At first, the difference between wired and wireless packet transaction is analyzed. The basic concept we obtain is that when packet delayed occurs, the control stratagem used in wired transmission is not suitable for the case of wireless transmission. Hence, another difference stratagem for wireless communication is proposed. Then, based on the result of the first step, the TCP protocol of wired transmission will be modified to adapt the case of wireless transmission. Finally, the application software named “Network Simulator” is used to simulate the new scheme our proposal. The result shows that the modified scheme from wired TCP can perform well in the packet transmission of wireless communication. There are two significant contributions to the study of how to improve TCP performance in the wireless communication in our proposal as follows： (1) In the wireless network, when the transmission quality of signals , by cutting the package into smaller size appropriate, it can really increase the successful probability of transmission. (2) By applying the technique of to distinguish the case of network congestion or network disconnection the working efficiency of traditional TCP can be enhance in our proposal. The simulation results show that our proposed mechanisms achieve better performance than the existent wired protocol. It is believed that the results of our study in this thesis will be probably practical and efficient on applications of the TCP.
參考文獻
延伸閱讀
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