Koenraad Laevens

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— The problem of sharing bandwidth in a communication network has been the focus of much recent research aimed at guaranteeing an appropriate quality of service to users. This is particularly challenging in an environment with a great diversity of users and applications, which makes it difficult, if not impossible, to tightly constrain user attributes and(More)
This paper describes the use of Congestion Pricing as a means of providing Congestion Control and Diierentiated Quality of Service. The application of the proposed technique to the Internet Protocol has the advantage that it can be simply implemented using Explicit Congestion Notiication. In particular: the network mechanism is independent of higher level(More)
In this paper we describe a study of an end-to-end architecture in a packet network where congestion is signalled to all contributing users, who then react accordingly. We assume a generic form of packet marking, where congested nodes set a single bit in the packets flowing through them using ECN (Explicit Congestion Notification). We briefly describe how(More)
We investigate the behaviour of an asynchronous optical buffer by means of a continuous-time queueing model. Through a limit procedure, previously obtained results for a discrete-time queueing model are translated to a continuous-time setting. We also show that the same results can be obtained by a direct analysis using Laplace transforms. Closed-form(More)
We consider congestion pricing as a mechanism for sharing bandwidth in communication networks, and model the interaction among the users as a game. We propose a decentralized algorithm for the users that is based on the history of the price process, where user response to congestion prices is analogous to " fictitious play " in game theory, and show that(More)
— We present a detailed analysis of the maximum channel utilization and loss performance in an optical buffer having access to a single outgoing channel. As opposed to a conventional electronic buffer, such a system-consisting of a number of fiber delay lines-can only realize a discrete set of delays to resolve output port contention. This leads to an(More)
Optical Burst Switching proposes a future-proof alternative to the current electronic switching in the backbone. The involved optical buffers are implemented with a set of Fiber Delay Lines, and suffer serious performance loss, when compared to RAM. Various existing models trace this loss, but either lack generality, accuracy, or effectiveness. The optical(More)