We study the aggregated behaviour of the Transmission Control Protocol (TCP) with and without Explicit Congestion Notification (ECN) over a wide range of traffic conditions using different Active Queue Management (AQM) schemes. A new AQM scheme called Adaptive Rate-Queue Utilisation AQM (ARQUA) which attempts to provide high throughput while maintaining a target delay is proposed. We demonstrat...

The paper discusses how Explicit Congestion Notification (ECN) can be used to devise an Internet congestion control mechanism that is more rapidly reactive and allows best-effort flows to rapidly adjust to fluctuations in available capacity. Our ECN-mod protocol involves simple modifications to TCP behavior and leverages more aggressive marking-based router feedback. Simulations show that ECN-m...

As the Internet adapts to meet consumer demands for high performance in ubiquitous networking environments, congestion must be addressed using novel approaches to ensure system stability over increasingly unreliable and dynamic media. Our work focuses on implementing and studying the performance of two recent explicit congestion control protocols: XCP, eXplicit Control Protocol, and RCP, Rate C...

In this paper we study the energy cost (protocol processing and communication cost) and goodput of di erent avors of TCP (Transmission Control Protocol) in ad hoc networks. We implemented a testbed and measured the actual energy cost as well as goodput of running TCP Reno, Newreno, SACK (Selective ACKnowledgement) and a version that combines Explicit Link Failure Noti cation (ELFN) [7] and Expl...

A rate-based congestion control algorithm regulates cell emission rate of source end systems based on feedback information from the network. It was standardized by the ATM Forum for application to an ABR (Available Bit Rate) service class. In the standard, two types of congestion notification methods of the switch are specified: EFCI marking and explicit-rate marking. In this paper, we focus on...

IETF Pre-Congestion Notification (PCN) working group is working on mechanisms to ensure quality of service of voice and video traffic within a DiffServ domain in the Internet. These mechanisms operate at the domain boundary based on congestion information from within the domain. The reaction mechanisms at the boundary consist of flow admission and flow termination. In this paper, we present a s...

In this paper we present result from an application integrated congestion control mechanism designed for time-sensitive traffic based on the principle of direct protocol interactivity. In contrast to classical transport protocols we envision a transport mechanism, which is interactive and can provide event notification to the subscriber of its communication service. We then show a friendly adap...

AbstmctIn wireless mobile networks, loss of packets is mostly because of corruption of data on the wireless link. TCP responds to these losses as if they are due to congestion, and this results in poor throughput. We suggest enhancements to TCP that, if implemented, will help the receiver in separately identifying corruption losses and congestion losses. Based on this information, the receiver ...

Active queue control aims to improve the overall communication network throughput, while providing lower delay and small packet loss rate. The basic idea is to actively trigger packet dropping (or marking provided by explicit congestion notification (ECN)) before buffer overflow. In this paper, two artificial neural networks (ANN)-based control schemes are proposed for adaptive queue control in...

The PCN working group of the IETF discusses the use of pre-congestion notification (PCN) to implement flow admission control. Packet meters and markers are used on all network links and packet markings are recorded as congestion level estimates (CLEs) the egress nodes. The working group currently discusses the pros and cons of possible marking algorithms that play a major role in this new archi...