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TCP does not perform well in networks with stochastic channels, with links that randomly drop packets or have long outages. Diversity routing has been proposed to improve TCP's performance in these networks. In diversity routing, a sublayer between TCP and the network replicates each transmitted packet and sends the multiple copies along parallel paths. As long as at least one of the copies reaches...
Satellite communication has become important in the current global data communication due to its large coverage area. Satellite links are affected by two major concerns: long propagation delays, and relatively high error rates. Standard TCP congestion control variants were not designed to address these challenges. They generally depend on round trip times (RTTs), and hence suffer heavily if the RTTs...
TCP shows poor performance in high speed networks with large latencies as well as in wireless networks where link error rates are high. The main two factors degrading TCP performance are related to its conservative policies for sending rate increase and treating all packet losses as congestion-related. In order to address these limitations a number of solutions have been proposed. Most of them either...
In this paper, we study the performance of active queue management algorithms for packet queueing in Internet routers in the presence of new versions of the TCP congestion control mechanism. In particular, we compare the performance of tail drop, adaptive RED, AVQ, PI, REM and AN-AQM queueing in four TCP cases: (i) the classic New Reno protocol, (ii) the Sack protocol, (iii) the Fack protocol, (iv)...
This paper proposes a new TCP congestion control supporting loss-fairness, which also contributes to improving RTT fairness. It has been well known that smaller RTT flows grab more bandwidth than larger ones when they compete on the shared link. This is called RTT unfairness and is caused by congestion control mechanism of the current TCP. To solve this problem, many protocols have been proposed....
TCP-Illinois aims to address TCP's low throughput when operating in high-speed, high-delay networks. Previous research has shown that, due to its linear increase behaviour and to its relatively long congestion epochs, TCP-Illinois exhibits suboptimal scaling behaviour with an increasing path Bandwidth- Delay Product (BDP). This paper discloses our contributions towards improving the aggressiveness...
Normal TCP/IP operation is for the routing system to select a best path that remains stable for some time, and for TCP to adjust to the properties of this path to optimize throughput. By executing TCP's congestion control algorithms on multiple paths at the same time, a multipath TCP can shift its traffic to a less congested path, thus maximizing both the throughput for the multipath TCP user and...
Various studies have shown that regular TCP is inefficient in high-speed networks. This paper proposes F-TCP, a delay-based TCP variant, which is able to operate efficiently in high-speed networks. The slowstart phase of F-TCP continues until a threshold determined from probing the available bandwidth. When competing with loss-based flows F-TCP reduces it's window to a value derived from the available...
TCP now is widely used in Transmission Control Protocol; however, in the wireless network environment, TCP congestion control typically has some defects such as high-error rate, long-latency, low-bandwidth and frequent-movement, etc. In the wireless network, the implementation difficulty of congestion control mechanism is the degree of congestion, which is not only relevant to the length of the queue,...
Research into the performance issues of TCP over wireless networks has been the focus of much attention in recent years. In this paper, based on TCP Reno, an improved TCP congestion control algorithm named TCP-RQB is proposed in mixed wired/wireless networks. To apply the algorithm into a TCP enhancement scheme, the ratio of the number of queuing packets to the buffer size in bottleneck link is estimated...
Due to the fundamental end-to-end design principle of the TCP/IP for which the network cannot supply any explicit feedback, today TCP congestion control algorithm implements an additive increase multiplicative decrease (AIMD) algorithm. It is widely recognized that the AIMD mechanism is at the core of the stability of end-to-end congestion control. In this paper we describe a new mechanism. The key...
A number of analytical models of the TCP behavior have been presented recently. Most of the studies on TCP assume a fixed number of persistent TCP connections. A few of the recent studies look at non-persistent TCP connections but with many limiting assumptions. Moreover, nearly all non-persistent studies are macroscopic and not scalable. This paper introduces a scalable stochastic reward Petri nets...
The Transmission Control Protocol - TCP has been widely researched in many different networking technologies such as wireless, optical, satellite, sensor, and wired since it is the most used protocol on the Internet. In Wireless mesh networks, this protocol still has challenges due to its origin and implementations for wired networks. This paper proposes an adaptation on the congestion control mechanism...
To improve the performance of VPN connections we investigate how the bandwidth of multiple access links can be aggregated with inverse multiplexing to create a single, higher capacity logical communication link. But achieving the maximum possible aggregated TCP throughput becomes extremely challenging if the underlying links either use different technologies (e.g., DSL, cable modem) or suffer different...
Transmission control protocol (TCP) provides reliable end-to-end communications between any two devices on the Internet. Slow start mechanism is used when a source machine starts sending data to a destination, or when a TCP connection suffers packet loss and a retransmission timeout has occurred. Congestion avoidance mechanism is then used to transmit information with sustainable data rate from the...
Among the promising solutions for next generation Internet backbone, one can consider the optical burst switching (OBS) technology. On the other hand, TCP protocol constitutes the most dominant transport protocol in the Internet. Thus, it is important to consider the implementation of TCP protocol over the OBS technology. The main issue in the implementation of TCP protocol over OBS networks is the...
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