Abstract
The Transmission Control Protocol (TCP) is traditional, dominant and has been de facto standard protocol, used as transport agent at transport layer of TCP/IP protocol suite. Basically it is designed to provide reliability and assure guaranty to end-to-end delivery of data over unreliable networks. In practice, most TCP deployments have been carefully designed in the context of wired networks. Ignoring the properties of wireless Ad Hoc Networks, therefore it can lead to TCP implementations with poor performance. The problem of TCP and all its existing variations within MANETs resides in its inability to distinguish between different data packet loss causes, whenever the data loss occur traditional TCP congestion control algorithm assumes loss is due to congestion episode and reduces sending parameters value unnecessary. Thus, TCP has not always the optimum behavior in front of packet losses which might cause network performance degradation and resources waste. In order to adapt TCP over mobile Ad hoc environment, improvements have been proposed based on RTT and BW estimation technique in the literature to help TCP to differentiate accurate causes between the different types of losses. But still does not handle all the problems accurately and effectively. In this paper, a proposed TCP-Costco Reno a New Variant, accurately estimates the available bandwidth over Mobile Ad Hoc networks and sets sending rate accordingly to maximize utilization of available resources and hence improves performance of TCP over mobile Ad hoc networks. The results of the simulation indicate an improvement in throughput over interference, link failure and signal loss validation scenarios. Further, it shows highest average of average throughput then those variants which are most successful over MANETs.
Highlights
The phenomenal growth experienced by the Internet over the last decade has been supported by a wide variety of evolving mechanisms to meet the requirements of emerging, demanding applications
In Transmission Control Protocol (TCP) Westwood, the setting of SSThreshHold and congestion window (CWND) is based on the bandwidth estimation, which is obtained by measuring the rate of the acknowledgments and collecting the information of the amount of packets delivered to the receiver in the ACK
TCP variants are well adapted to deal with all data packet loss situations that can be encountered within wireless ad hoc networks
Summary
The phenomenal growth experienced by the Internet over the last decade has been supported by a wide variety of evolving mechanisms to meet the requirements of emerging, demanding applications. TCP has been successful due to its robustness in reacting dynamically to changing network traffic conditions and providing reliability on an end-to-end basis. This Wide acceptance has driven the development of many TCP applications, motivating the extension of this protocol to wireless networks. MANET consists of unstable wireless communication links in compare to the wired network [1]. This instability is mainly due to mobility of nodes. Congestion control is the most controversial parts of TCP which degrades performance in front of packet loss [9].
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