tailieunhanh - Báo cáo hóa học: " Research Article Modeling the Lion Attack in Cognitive Radio Networks"

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 Modeling the Lion Attack in Cognitive Radio Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 242304 10 pages doi 2011 242304 Research Article Modeling the Lion Attack in Cognitive Radio Networks Juan Hernandez-Serrano 1 Olga Leon 1 and Miguel Soriano2 1 Department of Telematics Engineering Universitat Polit ecnica de Catalunya 08034 Barcelona Spain 2Centre Tecnol gic de Telecomunicacions de Catalunya CTTC 08860 Barcelona Spain Correspondence should be addressed to Olga Leon olga@ Received 1 June 2010 Accepted 23 July 2010 Academic Editor Christos Verikoukis Copyright 2011 Juan Hernandez-Serrano et al. 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. Cognitive radio is a promising technology aiming to improve the utilization of the radio electromagnetic spectrum. A cognitive radio is a smart device which runs radio applications software to perform signal processing. The use of this software enables the device to sense and understand its environment and actively change its mode of operation based on its observations. Unfortunately this solution entails new security challenges. In this paper we present a cross-layer attack to TCP connections in cognitive radio networks analyze its impact on TCP throughput via analytical model and simulation and propose potential countermeasures to mitigate it. 1. Introduction Traditionally spectrum has been allocated by regulatory agencies such as the Federal Communications Commission FCC in a static and inefficient manner. All frequencies below 3 GHz are assigned to specific services which operate under license leading to a lack of spectrum for new wireless applications. However recent studies show that most of the time the allocated spectrum is vastly underutilized. In this context Cognitive Radio Networks CRNs emerge as a possible .