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Increasing attention is paid to mobile ad hoc networks last time. Application of such networks expands a range of opportunities in activity felds of man. The main objective of mobile ad hoc networks, as well as any other, is data transmission. It is provided by TCP. This paper is devoted to the performance evaluation of TCP under influence of various MANET aspects separately and together. The paper...
Because of the features of HAPs networks, TCP performance is challenged. In order to solve the TCP problems, optimization of TCP is researched in this paper. An optimized TCP for HAPs network (TCP-HAP) is proposed. It consists of three mechanisms which are rapid congestion notification, reason of packet loss recognition and traffic oriented congestion control. In TCP-HAP, the congestion message is...
In the current internet, Transmission Control Protocol (TCP) is used as the most popular transport layer protocol. However, the end-to-end throughput of TCP degrades significantly when operates in wireless networks. Frequent retransmission timeout is one of the well-known problems of TCP end-to-end throughput degradation over wireless networks. In wireless networks, a retransmission timeout is inevitable,...
The satellite communications are used more and more widely. But these kind of communications have a lot of different characteristics, such as long link delay and high bit error rate. Our research aims to find out the efficient protocol between TCP and SCPS-TP transport protocol through simulation topology method.
Having reliable communications during large scale emergency situations is of paramount importance in today's world. In particular, broadcasting critical information to both survivors and rescue teams is an important component of emergency communications. Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion...
High speed satellite communication networks are emerging as part of the future global wireless communication systems. However, existing transmission control protocols for satellite networks do not provide satisfactory performance over high speed satellite links due to their inefficient congestion avoidance algorithms. This paper identifies the reason for low throughput of a widely used protocol space...
Applications operating over airborne networks are known to perform quite sub-optimally. Transmission control protocol (TCP) based applications often experience very low data throughput, while the user datagram protocol (UDP) based applications suffer high packet loss as well as out-of-order delivery. This is due to the high bit error rate (BER) nature of the wireless links and the high mobility of...
In order to improve the performance of existing multicast congestion control mechanisms applied to wireless networks, in this paper, we propose an expert-control-based intelligent multicast congestion control mechanism for wireless networks, termed ECMCC. ECMCC detects the network congestion state according to network relative queuing delay and packet loss, feedbacks information to multicast source...
Congestion control of TCP protocol will reduce the size of congestion window to insure data transmission and reduce the degree of network congestion when a packet loss event that is regarded as a symbolic event of network congestion occurs. This method can be very effective in the low BER link, but it causes a sharp reduction of data transmission performance of TCP in a high BER link such as wireless...
Transmission Control Protocol was designed to work over the networks characterized by low delay and negligible bit error rates. Transmission Control Protocol (TCP) performance degrades when TCP traffic is carried over the satellite networks that have large latency, high bit error rates and path asymmetry. To comprehend the effect of satellite conditions over TCP, we have evaluated the TCP performance...
In this paper, we present a new analysis of the optimal throughput of a single user for transporting MPEG-4 video over universal mobile telecommunication system (UMTS) network. A wireless channel considers that bit errors associated with link-layer packets are due to the time-varying features of a wideband code-division-multiple access (WCDMA) channel. By this network, the perceived video quality...
Forward error correction (FEC) scheme has dual side-effects on the throughput performance for the satellite networks. One is to consume some extra bandwidth to send redundant information, and the other is to disable the corruption-aware TCP variants to differentiate the corruption events from the loss events. This may result in significant throughput jitter while satellite channel is in an unsteady...
Network simulation is one of the most important and flexible methods in studying protocol since it allows virtually endless numbers of network environments to be simulated and protocol of interest to be studied without requiring real-world complicated and costly experiment. However, depending on researchers, protocol can be implemented in different ways and different implementations may result in...
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