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1 $EVWUDFW AQUILA, a joint European research project funded by EU, defines and implements a new Resource Control Layer (RCL) to enable dynamic end to end QoS provisioning in IP networks for QoS sensitive applications in a scalable and efficient way. The RCL controls the resource usage in an IP backbone that supports different transport services through the 'LIIHUHQWLDWHG 6HUYLFHV (DiffServ) approach. In the DiffServ model the Admission Control (AC) is performed by the elements at the edge of the network. To gain scalability, the AC decision must be based on locally stored information at these elements – mainly resources availability – and keep low the amount of interactions with the rest of the network. To gain efficiency, the availability of resources within the network must be dynamically tracked to some extent. To meet these twofold objective, in the framework of the AQUILA architecture a distributed provisioning architecture is proposed based on the concept of dynamical Resource Pool (RP). The RCL do not fix resource partitioning completely but retains flexibility through the concept of RPs. Hierarchical sets of RPs are used for dynamic resource re-distribution. This paper describes the RP approach in detail. The algorithms governing the RP dynamically are presented and discussed, including some relevant implementation aspects. The performances and robustness of such algorithms are investigated through extended simulations, whose results are detailed presented. Finally, the relevant trade-offs and some possible refinements are illustrated.