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Báo cáo hóa học: " Research Article Persistent RCSMA: A MAC Protocol for a Distributed Cooperative ARQ Scheme in Wireless 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 Persistent RCSMA: A MAC Protocol for a Distributed Cooperative ARQ Scheme in Wireless Networks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 817401 13 pages doi 10.1155 2008 817401 Research Article Persistent RCSMA A MAC Protocol for a Distributed Cooperative ARQ Scheme in Wireless Networks J. Alonso-Zarate 1 E. Kartsakli 2 Ch. Verikoukis 1 and L. Alonso2 1 Centre Tecnològic de Telecomunicacions de Catalunya CTTC Avinguda Del Canal Olimpic S N Parc Mediterrani de la Tecnologia 08860 Castelldefels Barcelona Spain 2 Department of Signal Theory and Communications Escola Politecnica Superior de Castelldefels EPSC Universitat Polit ecnica de Catalunya UPC Avinguda Del Canal Olimpic S N Parc Mediterrani de la Tecnologia 08860 Castelldefels Barcelona Spain Correspondence should be addressed to J. Alonso-Zarate jesus.alonso@cttc.es Received 15 November 2007 Accepted 2 April 2008 Recommended by J. Wang The persistent relay carrier sensing multiple access PRCSMA protocol is presented in this paper as a novel medium access control MAC protocol that allows for the execution of a distributed cooperative automatic retransmission request ARQ scheme in IEEE 802.11 wireless networks. The underlying idea of the PRCSMA protocol is to modify the basic rules of the IEEE 802.11 MAC protocol to execute a distributed cooperative ARQ scheme in wireless networks in order to enhance their performance and to extend coverage. A closed formulation of the distributed cooperative ARQ average packet transmission delay in a saturated network is derived in the paper. The analytical equations are then used to evaluate the performance of the protocol under different network configurations. Both the accuracy of the analysis and the performance evaluation of the protocol are supported and validated through computer simulations. Copyright 2008 J. Alonso-Zarate 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