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We introduce a transmission control protocol with a delay based congestion avoidance. The protocol design follows a control theoretical approach, uses session path estimators, and is adaptive and stable to a wide range of path characteristics and network conditions. We demonstrate the competitive performance of the protocol via open source based network experiments over a research network and the...
As an all-IP network provides not only services that have been traditionally provided on the Internet but also many other services, it has a dramatically higher risk than conventional networks that an occurrence of congestion in one service leads to congestion in other services. Unlike conventional networks, an all-IP network should provide not only bandwidth but also processing ability simultaneously...
This paper is concerned with the robustness of AQM controller in internet congestion control. For the parameter variety and disturbance in TCP/IP network, a robust H∞ optimal AQM controller is designed based on uncertain time-delay model of the systems. The existence condition of the observer is obtained by applying Lyapunov method and matrix inequalities, and the design method of the feedback controller...
Rate control plays an important role in delivering video traffic over the Internet due to highly bursty nature of the video data and variability of the network bandwidth. The researchers in this area are either controlling the video rate coding or optimizing the congestion control to support the video traffic transmission. As a consequence of layering principle of the network architecture, the algorithm...
Network congestion in the heterogeneous Internet, which is connected by millions of asynchronous systems, poses a serious threat to communication and intermediate nodes that falls under its path. The primary cause of network congestion is that data in networks are overloaded and available resources are inadequate to contain such traffic loads. An enormous amount of proposed approach towards network...
The most common broadband access technology today is the (Asymmetric) Digital Subscriber Line (A)DSL. As the name implies, ADSL allocates the bandwidth of upstream and downstream asymmetrically, significantly favoring the downstream direction. Popular applications that serve content over these networks in the upstream direction, such as peer-to-peer (P2P) applications, efficiently utilize the comparably...
Several congestion pricing proposals have been made in the last decade. Usually, however, those proposals studied optimal strategies and did not focus on implementation issues. Our main contribution in this paper is to address implementation issues for congestion-sensitive pricing. We propose a new congestion-sensitive pricing framework edge to edge capacity contracting (EECC), which is able to provide...
Existing traffic characterization systems today use passive monitoring techniques. Compared with active measurements, passive measurements have their own disadvantages: they are not easy to implement and need the cooperation of intermediate nodes along the path. Hence they require hardware change, which can significantly increase the cost of measurements. This makes active measurements an attractive...
Internet “Congestion” occurs when the aggregate demand for a resource (e.g. link bandwidth) exceeds the available capacity of the resource. Resulting effects from such congestion include long delays in data delivery, wasted resources due to lost or dropped packets, and even possible congestion collapse, in which all communication ceases in the entire network. “Congestion control” mechanism, implemented...
Data Center Networks represent the convergence of computing and networking, of data and storage networks, and of packet transport mechanisms in Layers 2 and 3. Congestion control algorithms are a key component of data transport in this type of network. Recently, a Layer 2 congestion management algorithm, called QCN (Quantized Congestion Notification), has been adopted for the IEEE 802.1 Data Center...
The growing popularity of the World Wide Web is placing tremendous demands on the Internet. The world wide can be considered as a large distributed information system that provides access to shared data objects. As one of the most popular applications currently running on the Internet, the World Wide Web is of an exponential growth in size, which results in network congestion and server overloading...
This paper researches on QoS (Quality of Service) control problems for web servers. A Fuzzy Adaptive PI Control system is proposed in this paper. Via a basic PI controller, the system can dynamically adjust the ratio of request-accepting time in a control period, in order to turn down requests when the server is overloaded. Considering that in a real Internet environment, the network and server load...
Due to the challenging nature of nonlinearity and time-varying behaviors in TCP dynamics, traditional active queue management (AQM) algorithms suffer from poor robustness under dynamic network scenarios. To address the above problem, a novel congestion control scheme named FSM-AQM is proposed via the fuzzy sliding mode control, which is robust against uncertainties and time-varying parameters of the...
A few months ago, BitTorrent developers announced that the transfer of torrent data in the official client was about to switch to a new application-layer congestion-control protocol using UDP at the transport-layer. This announcement immediately raised an unmotivated buzz about a new, imminent congestion collapse of the whole Internet. As the new congestion control aims at offering a lower than best...
Congestion control is the key techniques of Next-Generation-Networks. The classical TCP congestion control such as RED is difficult to configure parameters and the average queue length is related to the load level. A network-measurement based on congestion control algorithm is proposed, the essential idea is introduce macroscopic guidance according to network measurement, the measurement facilities...
Congestion control is an important research area in wireless mesh network(WMN). In order to solve congestion control in WMN, a random routing algorithm based on path weights (WA) is presented. The algorithm adopts multi-gateway wireless mesh network routing protocol to solve the congestion problem of single gateway. And anycast service was used to ensure the successful rate of service requests. Simulation...
This paper presents a protocol designed as an alternative to classical TCP for channels which experience high loss-rates. The protocol is simplified with respect to TCP by eliminating the need of retransmissions and the associated buffers. This is achieved by applying a rateless erasure correcting code to the data that is going to be transferred. A modified version of the TCP congestion control algorithms...
The traditional PID controller parameters are hard to tune timely under the rapid changes of the dynamic network circumstances, which affect the PID algorithm's control effects on network data flows. To alleviate the problem, a novel AQM algorithm based on PID controller is proposed, called the improved expert intelligent PID algorithm (IEI-PID). By combining expert knowledge with PID and adding more...
New rate control schemes are necessary for Internet streaming flows to smoothly use the available bandwidth. To equally share the Internet bandwidth with existing TCP flows, these schemes should meet the TCP-equivalent criterion, i.e. the same rate as TCP under the same network conditions. This work proposes a window-averaging rate control (WARC) scheme to sends packets at the average rate that a...
According to different priority based services, IEEE 802.16e WiMAX standard classifies packets as UGS, RTPS, eRTPS, nRTPS, BE. The standard treats all packets generated while browsing the internet as delay tolerant packets and classifies them as Best Effort (BE) packets. This includes BE packets generated while browsing secure websites. However, secure transactions are governed by time constraints...
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