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Previous work on the coverage of mobile sensor networks focuses on algorithms to reposition sensors in order to achieve a static configuration with an enlarged covered area. In this paper, we study the dynamic aspects of the coverage of a mobile sensor network that depend on the process of sensor movement. As time goes by, a position is more likely to be(More)
A stochastic model is introduced that accurately models the message delay in mobile ad hoc networks where nodes relay messages and the networks are sparsely populated. The model has only two input parameters: the number of nodes and the parameter of an exponential distribution which described the time until two random mobiles come with communication range(More)
We propose a general framework for obtaining asymptotic distributional bounds on the stationary backlog W A 1 +A 2 ;c in a buuer fed by a combined uid process A 1 + A 2 and drained at a constant rate c. The uid process A 1 is an (independent) on-oo source with average and peak rates 1 and r 1 , respectively, and with distribution G for the activity periods.(More)
The Differentiated services (diffserv) architecture has been proposed as a scalable solution for providing service differentiation among flows without any per-flow buffer management inside the core of the network. It has been advocated that it is feasible to provide service differentiation among a set of flows by choosing an appropriate “marking(More)
We propose a multiclass fluid model for BitTorrent-like content distribution systems. The new model can model heterogeneous peers, in which peers have different access bandwidths. The model can also model BitTorrent-like systems which provide differential service (for example, first class and second class service) to the participating peers. The fluid model(More)
—In this paper we propose an optimal on-line estimation algorithm for determining the size of a dynamic multicast group. By using diffusion approximation and Kalman filter, we derive an estimator that minimizes the mean square of the estimation error. As opposed to previous studies, where the size of the multicast group is supposed to be fixed throughout(More)