218 research outputs found
Video TFRC
TCP-friendly rate control (TFRC) is a congestion control technique that trade-offs responsiveness to the network
conditions for a smoother throughput variation. We take
advantage of this trade-off by calculating the rate gap between the theoretical TCP throughput and the smoothed TFRC throughput. Any rate gain from this rate gap is then
opportunistically used for video coding. We define a frame
complexity measure to determine the additional rate to be used from the rate gap and then perform a rate negotiation to determine the target rate for the encoder and the final sending rate. Results show that although this method has a more aggressive sending rate compared to TFRC, it is still TCP friendly, does not contribute too much to network congestion and achieves a reasonable video quality gain over the conventional method
Queue Management Performance Evaluation of REM, GRED, and DropTail Algorithms
As the new user applications and Internet traffic are increased rapidly Rapid growth, the need for developing the Internet infrastructure that guarantee good level of quality of service became necessary. Congestion that is caused by uncontrollable amount of traffic remains as a main problem that threats the Quality of Service (QoS) on the Internet. Proactive Queue Management Mechanisms employed in the Internet routers help in improving the performance of responsive applications such as TCP applications. The selection of Active queue management mechanism plays an important role that leads to well network performance and utilization. In this project, we performance evaluation for examining the performance of the some of the known queue management mechanisms, namely DropTail, REM, and RED proposed for IP routers to achieve performance among competing sources. The purpose of this performance examination is to identify the key parameters to improve the fairness and link utilization in TCP/IP networks. In addition, this will help obtaining a better understanding of these mechanisms by identifying and clarifying factors that influence their performance in order to improve TCP/IP networks performance overall
Simulation of the Effect of Data Exchange Mode Analysis on Network Throughput
Emergence of large scale specialized networks with a large number of computers
marked a new stage in network infrastructure development. In connection with the wide
variety of modern network equipment used for construction of large-scale networks and
increasing complexity of such networks and applications, a developer or system
administrator can no longer depend mainly on intuitive decisions. Optimum network configuration for realization of concrete tasks and effective deployment of applications in modern terms is not possible without conducting a proper research with the use of specialized simulation tools. Increase in bandwidth is followed by a commensurate increase
in the amount of traffic sent over the Internet. Optimizing the use and allocation of bandwidth continues to be an ongoing problem. We present a simulation model to resolve
the technological challenges of increasing the efficiency of data exchange in computer networks
RED behavior with different packet sizes
We consider the adaptation of random early detection (RED) as a buffer
management algorithm for TCP traffic in Internet gateways where different
maximum transfer units (MTUs) are used. We studied the two RED variants
described in [4] and point out a weakness in both. The first variant where drop
probability is independent from the packet size discriminates connections with
smaller MTUs. The second variant results in a very high packet loss ratio
(PLR), and as a consequence low goodput, for connections with higher MTUs. We
show that fairness in terms of loss and goodput can be supplied through an
appropriate setting of the RED algorithm.Comment: 13 pages, submitted to IEEE symposium on computer communications
(ISCC2000
Wormhole - An Active HTTP Tunnel
Browsing the world wide web over a high-latency network connection is frustrating. We propose an āactiveā
HTTP Tunnel, Wormhole, to significantly reduce webpage load times in such a scenario
Congestion-Free Network using Network-Based Protocol
The Internetļæ½s exceptional scalability and sturdiness results in the formof end-to-end Internet crowding control. End-to-end crowding control algorithms are not responsible for preventingcrowdingdownfall and inequityproduced by applications that are impassive to network crowding. To overcome these, we have proposed a newcrowding-avoidance tool called Congestion Free Router (CFR). CFR involves the give-and-take of response between routers at the boundaries of a network in order to sense and curbimpassive traffic flow before they enter the network, thereby preventing crowding within the network
GTFRC, a TCP friendly QoS-aware rate control for diffserv assured service
This study addresses the end-to-end congestion control support over the DiffServ Assured Forwarding (AF) class. The resulting Assured Service (AS) provides a minimum level of throughput guarantee. In this context, this article describes a new end-to-end mechanism for continuous transfer based on TCP-Friendly Rate Control (TFRC). The proposed approach modifies TFRC to take into account the QoS negotiated. This mechanism, named gTFRC, is able to reach the minimum throughput guarantee whatever the flowās RTT and target rate. Simulation measurements and implementation over a real QoS testbed demonstrate the efficiency of this mechanism either in over-provisioned or exactly-provisioned network. In addition, we show that the gTFRC mechanism can be used in the same DiffServ/AF class with TCP or TFRC flows
A Comparison of Performance between TFRC and UDP over a Mobile IP Network
In this project we will study three performance metrics (packet loss, packet delay and jitter) of two different transport layer protocols over a Mobile IP Network. The researcher will be implementing TFRC and UDP in the Mobile IP Network, to identify which protocols could support mobility. Network Simulation NS-2 was proposed for implementing previous items and to present and interpret the results
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