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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Reference Chaser Bandwidth Controller for Wireless QoS Mapping under Delay Constraints | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 961690 8 pages doi 10.1155 2010 961690 Research Article Reference Chaser Bandwidth Controller for Wireless QoS Mapping under Delay Constraints M. Marchese and M. Mongelli Department of Communications Computer and Systems Science DIST University of Genoa Via Opera Pia 13 16145 Genova Italy Correspondence should be addressed to M. Marchese mario.marchese@unige.it Received 14 January 2010 Accepted 11 October 2010 Academic Editor Dilip Krishnaswamy Copyright 2010 M. Marchese and M. Mongelli. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Telecommunications networks are composed of functional layers acting in cascade. Quality of Service QoS derives from the action of each layer that must assure a specific level of quality to the upper layer in terms of performance parameters e.g. loss delay jitter of the packets . Appropriate algorithms are needed to compute the bandwidth necessary so to assure the requested QoS when information is transferred from one layer to the next one below. This paper proposes a scheme that adapts the bandwidth to be allocated to a buffer which conveys heterogeneous traffic both concerning traffic sources and QoS requirements in a layer-in-cascade model. The proposal is focused on delay constraints. The proposed algorithm is based only on measures and does not use closed-form expressions a priori information about traffic statistical properties and assumptions about buffer dimension. Simulation results show the reliability of the approach in comparison with other techniques at the state of the art thus corroborating the application of the algorithm for a large set of operative situations including fading conditions. 1. Introduction Modern telecommunication networks are .
