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Real time network applications require effective mechanisms for managing Internet traffic in order to avoid or at least limit the level of congestion. We propose, design and analyze an Active Queue Manager (AQM) for controlling jitter using robust control theory. We used an output feedback controller and this controller is based on discrete-time model of TCP. The natural properties of robust controller...
Although TCP is one of the key protocols of the Internet infrastructure, it is not optimized for either wireless environment or multimedia streaming applications. It fails to meet the service requirement of streaming applications because of its strict adherence to congestion control. Besides, non-congestion packet loss fools TCP to slow down its sending rate over wireless links. Fast TCP and TCP Westwood+...
The simulation of congestion control algorithms of TCP networks is discussed in this paper. Simulation is a widespread procedure for testing and understanding how real systems evolve. Internet has a great impact in our society. Everyone wants fast and reliable links, but sometimes congestion happens because the network delay and the number of users fluctuate from one moment to the next. There are...
Active Queue Management (AQM) algorithms play an important role in fair bandwidth allocation. In order to guarantee Quality of Service (QoS) to diverse Internet services, it is important to employ effective buffer management schemes at Internet routers. Controlling the size of the buffer is determined by the dynamics of TCP's congestion control algorithms. Therefore, effectively constraining the mean...
As the Internet owes its scalability and stability to TCP, congestion control also plays a key role in the performance, efficiency, and stability of datacenters, as evidenced by the efforts to standardize congestion management (CM) for 10+ Gbps networks. The next step up from datacenters is CM for clouds. New solutions are necessary for clouds because, while the recent CM schemes have been tested...
As other signaling protocols in the past, also SIP suffers of server overload leading to performance collapse. In this framework, recent Internet drafts propose the improvements of overload control mechanisms already presented in SIP and/or a closed loop system model for overload avoidance. In this framework, the paper presents the system simulator developed extending the network simulator (ns-2)...
DDoS attacks has brought severe damage to the Internet Today's internet security has increasingly become a severe threat. For DDoS attacks characteristics we judge abnormal flow of data by RaiiTa criterion and control flow by token barrels filter to avoid abrupt flow.
We present data acceleration and reduction technology (DART), a new rate based congestion control and scheduling mechanism with integrated data compression. DART has been implemented in the 7-ip satellite gateway products and is based on SCPS-TP framework. We evaluate the performance of this scheme on two live commercially available satellite systems, IPSTAR and Inmarsat BGAN and compare it to the...
A wireless mesh network (WMN) is a collection of wireless network nodes that communicate among themselves. Unlike wireless local area networks, WMNs are self configuring systems, where each node can relay messages on behalf of others. This allows coverage of a much larger geographical area than if all nodes needed to be able to communicate directly with a central node. WMNs promise to deliver wireless...
Supporting Quality of Service (QoS) in a core transport is an important feature of a next generation network. This feature not only enables real-time communication services such as Voice over IP (VoIP) and video telephony, but also helps create new applications. However, access gateway such as Packet Data Gateway (PDG) in IMS WLAN Interworking, located at the edge of an IMS core network, must inspect...
Vehicle traffic congestion is reflected as delays while traveling. Traffic congestion has a number of negative effects and is a major problem in today's society. Several techniques have been deployed to deal with this problem. In this paper, we have proposed an innovative approach to deal with the problem of traffic congestion using the characteristics of vehicular ad-hoc networks (VANET). We have...
As bandwidth in the Internet continues to grow, there will be more and more long fat network pipes with abundant residual bandwidth. At the same time, there is also a gradual and steady increase in the deployment of Internet endpoints equipped with different variants of high speed TCP. In this work, we first illustrate drawbacks associated with two widely deployed high speed TCP variants, namely:...
In this paper, we propose a new routing algorithm which combines source routing and intermediate routing in order to meet the requirement of node disjointed path and scalability. We also discover the existing of key nodes which we call KN, KN are the transmission congestion host spots, also in multi-path routing, they will lead to a low performance in disjointed path. We give a simple, effective method...
The interest in solving the issue of congestion or flow control in network established from the first discovery and increase popularity of the Internet in 1967 or earlier. As the use of the network deployed and the popularity increase, the issue grows and the demand for an optimal or tentative solution becomes obvious. Since that time there has been an intensive effort from the scholars and researchers...
End-to-end rate-based congestion control algorithms are advocated for audio/video transport over the Internet instead of window-based protocols. Once the congestion controller has computed the sending rate, all rate-based algorithms proposed in the literature schedule packets to be sent spaced at intervals that are equal to the inverse of the desired sending rate. In this paper we show that such an...
RED is the only active queue management mechanism recommended by IETF. Though RED is successful in network congestion control and link utilization enhancement, it suffers from two problems, the stability and the fairness. The fairness problem means 1) RED has little affects on unresponsive flows in congestion control - the UDP flow for example; 2) responsive flows with different packet size or round...
Since the TCP protocol implements in the Internet, the AIMD algorithm has always been the dominating congest control algorithm for about 20 years, and most of the common operating systems follow the recommendation of the IETF to adopt the AIMD algorithm in their TCP variations. But in recent years, many high-speed congest control algorithms have been proposed for fast data transfer over high speed...
Fuzzy Control has been a research highlight in network congestion control field. But many existed fuzzy algorithm's parameters and fuzzy rules are static, so it have defect in respond speed, stability and environment sensitivity. As to these problems mentioned above, Based on the existed FREM (Fuzzy Random Exponential Marking) algorithm, this thesis explores adaptive FREM algorithm-AFREM(adaptive...
Modelling traffic generated by Internet-based multiplayer computer games has attracted much attention in the past few years. This has been driven by a need to simulate correctly the network impact of highly interactive online game genres such as the first person shooter (FPS). Packet size distributions and autocovariance models are important elements in the creation of realistic traffic generators...
A mechanism for reducing reverse traffic in the fuzzy logic based dual explicit congestion notification mechanism is proposed for satellite TCP/IP networks. A linguistic hedge based backward explicit congestion notification (BECN) activation function is employed in order to ensure that reverse traffic is generated only when congestion is extremely high. A source initiated RTT reverse traffic reduction...
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