In this paper we propose a new paradigm for a Differential Service (DiffServ) network consisting of two-color marking at the edges of the network using token buckets coupled with differential treatment in the core. Using fluid-flow modelling, we present existence conditions for tokenbucket rates and differential marking probabilities at the core that result in all edges receiving at least their...

FAST TCP is Fast Active queue management Scalable Transmission Control Protocol. FAST TCP is an alternative congestion control algorithm in TCP. It is designed for high speed data transfers over large distance. FAST TCP is assumed to be the “successor” of TCP. Lot of people already worked on this subject. Their research work and results yield a new dimension for the entertainment and scientist ...

This paper proposes a Particle Swarm Optimization (PSO) method for determining the optimal parameters of a first-order controller for TCP/AQM system. The model TCP/AQM is described by a second-order system with time delay. First, the analytical approach, based on the D-decomposition method and Lemma of Kharitonov, is used to determine the stabilizing regions of a first-order controller. Second,...

A TCP/RED (Transmission Control Protocol/Random Early Detection) system with multiplebottleneck links could be unstable even if its system parameters are set the same as those in a stable single-bottleneck system [D. Bauso, L. Giarre, G. Neglia, Active queue management stability in multiple bottleneck networks, IEEE ICC’04, vol. 4, June 2004, pp. 2267– 2271]. In this paper, we study the stabili...

The congestion control mechanisms used in TCP have been the focus of numerous studies and have undergone a number of enhancements. However, even with these enhancements, TCP connections still experience alarmingly high loss rates, especially during times of congestion. To alleviate this problem, the IETF is considering active queue management mechanisms, such as RED, for deployment in the netwo...

In this paper we study a previously developed linearized model of TCP and AQM. We use classical control system techniques to develop controllers weU suited for the application. The controllers are shown to have better theoretical properties than the wetll known RED controller. We present gnidetines for designing stable controllers subject to network parameters tike load level, propagation delay...

In this paper we explore a control architecture that can implement active queue management and transport control. For queue management, two independent metrics — utilization factor and burstiness factor , are used to characterize queueing congestion state. Consequently, two information bits are generated to guide the sender’s adaptation of traffic intensity and burstiness. Transport control is ...

Mobile networks are intriguing in recent years due to their practical implications. Previous routing strategies for improving transport efficiency have little attention what order should the packets be forwarded, just simply used first-in-first-out queue discipline. Here we apply priority queueing discipline to shortest distance routing strategy on mobile networks. Numerical experiments show it...

Video streaming on the Internet often suffers from high frame loss rates due to fragmentation of large frames and inter-frame dependencies needed for high compression. We propose adding lightweight, priority-based queue management to Internet routers to significantly improve performance of video streaming. We extend a Rate-Based RED approach to support three priority classes and apply it to MPE...

The basic idea behind an active queue management (AQM) is to sense the congestion level within the network and inform the packet sources about, so that they reduce their sending rate. In literature a lot off mechanisms of AQM are studied. But there are not used in the context of the DiffServ architecture where different types of packet with different requirements of QoS share the same link. In ...