Detection of traffic congestion is an important issue both for the transportation research community and everyday life of the motorists. A new type of information is needed for a more efficient use of road networks. Remote sensing sensors installed on aircrafts or satellites enable data collection for various traffic applications over large areas, especially areas not covered with other, e.g. t...

In multicast congestion control, receivers can misbehave by maliciously causing congestion to steal network bandwidth from well behaved flows. In source driven congestion control protocols (SDCC), receivers misbehave by sending a wrong feedback to the source. In receiverdriven congestion control protocols(RDCC), receivers misbehave by inflating their subscriptions. In this report, we present te...

In this paper, we present a mechanism called DWRED (Dynamic Weighted RED) that uses communicating agents in a Multi-Agents Systems to enhance the Random Early Detection (RED) congestion management algorithm, by providing service for multiple classes of traffic as well as cooperation between the network nodes to dynamically modify the running algorithm’s parameters in response to network congest...

This report documents the results of research on congestion issues in Delay Tolerant Networks carried out by Durga Prasad Pandey during the summer of 2003. It consists of a proposal for an experiment to test the effectiveness of a cognition based congestion detection program. The experiment is proposed to be carried out during the academic year 2003-2004 as a final year research project at the ...

Many applications want to use TCP congestion control to regulate the transmission rate of a data packet stream. A natural way to achieve this goal is to transport the data packet stream on a TCP connection. However, because TCP implements both congestion and error control, transporting a data packet stream directly using a TCP connection forces the data packet stream to be subject to TCP’s othe...

This paper describes the design and simulation of a new AAL protocol (AAL-X) for improving TCP performance over wireless ATM networks. The wireless links are characterized by higher error rates and burstier error patterns in comparison with the fiber-based links for which ATM was designed. Since the poor performance of TCP over wireless ATM networks is mainly due to the fact that TCP always res...

Random Early Detection (RED) was proposed as an active gateway queue-management mechanism. This paper proposes to alter the RED design guideline that unconditionally allows transient congestion, and evaluates its impacts. This unconditional allowance of transient congestion is shown to be harmful when the queue is near full, because it causes buffer overflow at a gateway. Buffer overflow at a g...

Using ns-2 simulations, this paper evaluates an Adaptive Explicit Congestion Notification (AECN) router. By receiving round-trip time (RTT) source hints from each TCP flow, AECN divides flows into flow groups based on RTT ranges. AECN uses distinct flow group drop probabilities and a mark front scheme to provide higher goodput and better fairness than Random Early Detection (RED) and Explicit C...

Best eeort traac in the Internet is managed by end to end congestion control mechanisms whose limitations are known. The continuous Internet growth leads to more and more applications that don't \play the rules" of the end-to-end congestion control scheme. Simple mechanisms inside the routers, refered as random early detection (RED), provide a more eecient congestion control. It can also be use...

Globalisation, perhaps paradoxically, implies increased regionalisation: nation states come more and more to resemble regions of the global economy as international factor mobility increases. The present paper presents a new perspective on the modelling of regional economies. The fixed-cost element of public infrastructure is emphasised: this allows both the tax-base effect and congestion to be...