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Low Extra Delay Background Transport (LEDBAT) congestion control algorithm is designed to address the unfairness problem of TCP aggravated by applications that use multiple TCP connections for data transfer. LEDBAT operates under the assumption that the queue delay at the access router of the bottleneck link will be the primary varying contributor to end-to-end one-way delay. However this assumption...
This paper designs a new scheme based on Controlled Vehicular Internet Access (CVIA), a protocol that divides a straight road into several segments. To avoid hidden nodes and reduce unnecessary CTS/RTS, vehicles send the packet to the road side unit (RSU) segment by segment. The features of CVIA include its high end-to-end throughput and fairness between road segments. However, a significant problem...
In mobile ad hoc networks (MANETs) where there exist multiple Internet gateways, performing load balancing among available gateways is vital in order to take full advantage of the network capacity and improve the performance. However, performing load balancing in a wireless environment is very challenging due to the inherently interfering and unreliable nature that characterize wireless communication...
Traffic management is the adaptation of source rates and routing to efficiently utilize network resources. Recently, the complicated interactions between different Internet traffic management modules have been elegantly modeled by distributed primal-dual utility maximization, which sheds new light for developing effective management protocols. For single-path routing with given routes, the dual is...
The enormous popularity of World Wide Web and its application of searching have caused a tremendous increase in network traffic and congestion in network. This project solves this problem by using the techniques of web caching and web prefetching implemented in our proxy system. Web caching has introduced as an effective solution to the problems of traffic congestion and effective bandwidth utilization...
We develop a protocol through which multipath enabled IP routers collectively engage in dynamic traffic engineering, to optimize performance in concert with legacy TCP congestion control. We build on recent theory which shows a globally optimum resource allocation across the TCP/IP layers can be achieved through control of rates and multipath routing fractions following a consistent congestion signal...
The volume of Internet traffic increases every year, caused by increased amounts of individual information. Quality of Service (QoS) controls is necessary to manage this traffic. Differentiated Service (Diffserv) is a promising technique to realize scalable QoS control in the internet; extensive efforts have been made for its practical use and it is already introduced in some networks. The control...
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...
In this paper, we propose a mechanism for packet marking called Probabilistic Congestion Notification (PCN). This scheme makes use of the 1-bit Explicit Congestion Notification (ECN) field in the Internet Protocol (IP) header. It allows the source to estimate the exact level of congestion at each intermediate queue. By knowing this, the source could take avoiding action either by adapting its sending...
Within the framework of a simple model, we are able to study the overall performance of a given informational network, depending on its uptaking as well as on the level of traffic control.We find that traffic control is useless in homogeneous networks but may improves global performance in inhomogeneous ones,enlarging the free-flow region in parameter space.Traffic control also introduces non-linear...
The objective of this paper is study the small signal stability of congested TCP networks. The starting point for this analysis is a fluid model describing the interaction of TCP-controlled traffic with congested routers. Assuming integral action in the active queue management scheme, we compute the network's equilibrium point about which we determine the network's small -signal dynamics. Some variations...
Delay-Tolerant Networks(DTN) are wireless networks where disconnections may occur frequently due to node mobility, power outages and propagation phenomena. In order to achieve data delivery, store-and-forward protocols are used in DTN and routing protocols based on epidemic message dissemination has been proposed, such as Epidemic routing. Under Epidemic routing, packets can be completely delivered...
Wireless mesh networks (WMNs) bring the convenience for daily access and infrastructure construction. To improve the throughput of WMN, more than one Internet gateway can be deployed to a WMN and the network throughput can be improved via well deployment of Internet gateways. Although the route redirection and the dynamic routing metrics can be used to improve the performance of WMNs, more available...
In this paper is introduced a FSC (Fuzzy Service Classification) algorithm. The algorithm adaptively changes weight coefficients that determine the amount of allowed bandwidth for each service class in the outputs of routers. New weight coefficients are calculated periodically on routers. The proposed fuzzy model simplifies the link sharing to two service classes: one for UDP and another for TCP....
After analyzing the rule of TCP congestion window protocol based on AIMD, the paper deduces the requisite route buffer and queuing delay of standard TCP and N-TCP when link reaches 100% utilization rate, and discusses the effect to the two achieving throughputs (bandwidth utilization) when the router buffer changes. Theoretical analysis and simulation show that, with the router buffer decreasing and...
In this paper, we study the interactions of user-based congestion control algorithms and router-based switch scheduling algorithms. We show that switch scheduling algorithms that were designed without taking into account these interactions can exhibit a completely different behavior when interacting with feedback-based Internet traffic. Previous papers neglected or mitigated these interactions, and...
This paper deals with the congestion control problem for queues in TCP/IP networks. In order to improve the congestion control performance for queues, based on the utility optimization source model proposed by Kelly, the linear and terminal sliding active queue management (AQM) algorithms are designed. Especially in the terminal sliding AQM algorithm, a special nonlinear terminal sliding surface is...
A wireless mesh network (WMN) is expected to be a key enabler for next generation networking due to its infrastructure-less strengths such as scalability, costefficient rapid deployment, and long distance communications. To boost the strength of WMNs, it is required to balance loads among multiple gateways as well as mesh nodes. However, there have been only few practical and easily-implementable...
Congestion control becomes the hot and difficulty issue of the Internet research. XCP provides a joint design of the end systems and the router, decoupling congestion control from bandwidth assignment strategy. However, the simulation experiment indicates VCP protocol have high link usage such as XCP, and it change present protocol a bit. This is helpful to put VCP into practice.
Currently, most multihomed-to-multiple providers need to control the flow of interdomain traffic for both performance and economical reasons. This is usually done by manual configuration of the Border Gateway Protocol (BGP) on routers to control interdomain traffic. In this paper, we approach the solution to the traffic engineering problem with BGP-based traffic engineering techniques and reservation...
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