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Heterogeneous communication networks with their variety of application demands, uncertain time-varying traffic load, and mixture of wired and wireless links pose several challenging problem in modeling and control. In this paper we focus on the round-trip time (RTT), which is a particularly important variable for efficient end-to-end congestion control.(More)
— Heterogeneous communication networks with their variety of application demands, uncertain time-varying traffic load, and mixture of wired and wireless links pose several challenging problem in modeling and control. In this paper we focus on the packet delay, which is an important variable for efficient end-to-end congestion control. In particular , we(More)
— The purpose of this paper is to develop a comprehensive framework for modelling and performance analysis of TCP/IP transport protocol across WCDMA wireless interfaces of third and future generations. In this context, we provide a semi-analytical model that captures the behaviours of relevant components of the wireless architecture, such as power control(More)
A fundamental assumption of the tcp protocol is that packet losses indicate congestion on the network. This is a problem when using tcp over wireless links, because a noisy radio transmission may erroneously indicate congestion and thereby reduce the tcp sending rate. Two partial solutions, that improve the quality of the radio link, are power control and(More)
This paper proposes an analytical framework for performance evaluation of TCP (Transport Control Protocol) over adaptive wireless links. Specifically, we include adaptation of power, modulation format and error recovery strategy, and incorporate some features of wireless fading channels. This framework is then used to pursue joint optimization through(More)
— A new control structure is proposed to improve user experience of wireless Internet. Information on radio bandwidth and queue length available in the radio network controller (RNC), close to the base station, is used in a proxy that resides between the Internet and the cellular system. The control algorithm in the proxy sets the window size according to(More)
TCP Westwood+ is modelled and analyzed using stochastic recursive equations. It is shown that for links with Poisson losses and independent and varying delays, TCP Westwood converges to a stationary process with a finite average throughput. The resulting throughput is computed explicitly, and it is shown that it does not depend on the filtering coefficient(More)
link bandwidth and the queue level. The proxy transport layer takes appropriate actions on these reports. By doing so, it utilizes the air-interface spectrum more efficiently and keeps the layer-2 queue in the RNC close a predetermined level. These new control mechanisms are evaluated through ns-2 simulations. In a number of realistic use cases it is shown(More)