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We have designed and investigated a new congestion control scheme, called the OFEX (Optimal and Fully EXplicit) controller. Different from the existing relatively explicit controllers, this new scheme is able to provide not only optimal bandwidth allocation but also fully explicit congestion signal to sources. It overcomes the drawback of the relatively explicit controllers that “bias” the multi-bottlenecked...
The goal of this work is to characterize scientific data transfers and to determine the suitability of dynamic virtual circuit service for these transfers instead of the currently used IP-routed service. Specifically, logs collected by servers executing a commonly used scientific data transfer application, GridFTP, are obtained from three US super-computing/scientific research centers, NERSC, SLAC,...
This paper proposes an intelligent rate controller for the Internet traffic. Called the IntelRate (Intelligent Rate), it is a router-based controller and uses the fuzzy logic control approach to adjust the source sending rate based on the instantaneous queue size of the router. Unlike other explicit congestion control protocols, the IntelRate controller need not evaluate the link states (such as bottleneck...
Admission and rate control are key components for providing QoS (Quality of Service) flows in multi- rate wireless ad hoc networks where transmission rate at the physical layer is adapted dynamically according to the channel condition. Key to these controls is the formulation of a rate constraint that can regulate the flow rate passing through each node. This paper formulates a cross-layer rate constraint...
As an explicit congestion control protocol, API-RCP (Adaptive PI rate control protocol) was originally proposed for best-effort traffic control in the IP networks with high bandwidth-delay product. The original API-RCP adopts a truncated network model for IP router in order to simplify the control system design while still achieving various designed performance measures at steady-state. A further...
TCP becomes inefficient and prone to instability when its bandwidth-delay product increases. By sending explicit congestion information from routers to end hosts, both XCP and API-RCP have been proposed to solve the stability issue of TCP in high bandwidth-delay product networks. Since the estimation errors of the network parameters are unavoidable, we would like to design a robust controller to address...
TCP is an important communication protocol as more and more multimedia technologies are deployed in the Internet nowadays. However, existing TCP control mechanism has some shortcomings in supporting real-time streaming traffic. Although UDP can be used as an alternative to transmit real-time application data, it lacks congestion control. Introducing a new TCP-friendly protocol that supports the multimedia...
The uplink performance of a 4G LTE system, which includes an eNodeB modem and higher layer network elements, is presented in this paper. The physical layer link performance of this pre-commercial prototype, along with comparisons to simulations, is presented. The performance characterization in the lab is done for the shared channel as well as the control channel. Further, we present a demonstration...
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