作者: Igor Bisio , Annamaria Raviola , Luciano Mancuso , Mario Marchese , Maurizio Mongelli
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摘要: Abstract : A telecommunication network is composed of a number nodes. Each node can be either terminal host or web cache location. Objects are downloaded throughout the among An object represent file any other resource to shared (e.g. machine time). For memory saving and for safety reasons, each portions not all located within same node, because no should have complete knowledge object. It means that single only part file. strongly recommendable if accessed without authorization, information retrieved sufficient detect overall content. Concerning networking viewpoint following main issues will characterize performance exchange: Position information, Strategy reach Algorithm download Capacity Planning. The paper proposes control architecture consider mentioned issues. three layers: Local, Network Planning Controller. Local Controller acts locally at downloading time scale (seconds/minutes) and, after an "advanced flooding" signaling query get informed about portions' position, decides from which (or nodes) portion needs downloaded; may change distribution nodes, with larger (hours/day) it centralized; dimension increase/decrease physical link capacities. order magnitude its intervention weeks/months. problem modeled through mathematical formulation specific cost function, takes into account necessary details introduced controller as well minimization procedure.