By Attahiru S. Alfa, Vicent Pla, Jorge Martinez-Bauset, Vicente Casares-Giner (auth.), Vicente Casares-Giner, Pietro Manzoni, Ana Pont (eds.)
This publication constitutes the refereed post-conference lawsuits of 4 workshops colocated with NETWORKING 2011, held in Valencia, Spain, in could 2011: the Workshop on functionality review of Cognitive Radio Networks: From concept to fact, PE-CRN 2011, the community Coding purposes and Protocols Workshop, NC-Pro 2011, the Workshop on instant Cooperative community safety, WCNS 2011, and the Workshop on Sustainable Networking, sundown 2011. The 28 revised complete papers provided have been rigorously reviewed and chosen from various submissions. The papers conceal a variety of themes addressing the most examine efforts within the fields of community coding, sustainable networking, safeguard in instant cooperative networks, and function overview of cognitive radio networks.
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Extra resources for NETWORKING 2011 Workshops: International IFIP TC 6 Workshops, PE-CRN, NC-Pro, WCNS, and SUNSET 2011, Held at NETWORKING 2011, Valencia, Spain, May 13, 2011, Revised Selected Papers
A measurement-based model for dynamic spectrum access in WLAN channels. In: Proc. IEEE Military Comms. Conf. (MILCOM 2006), pp. 1–7 (October 2006) 5. : Dynamic spectrum access in the time domain: Modeling and exploiting white space. IEEE Comms. Magazine 45(5), 66–72 (2007) 6. : A framework for statistical wireless spectrum occupancy modeling. IEEE Trans. on Wireless Comms. 9(1), 38–55 (2010) 7. : Spectrum survey in Singapore: Occupancy measurements and analyses. In: Proc. 3rd Int’l. Conf. on Cognitive Radio Oriented Wireless Networks and Comms.
1 Introduction In Cognitive Radio Networks (CRNs) , when multiple channels are available, Secondary Users (SUs) can decide to aggregate them together as one channel to support services with higher data rate or still to treat them as individual channels. The former alternative, channel aggregation, has been proposed in many Media Access Control (MAC) protocols [2–4] in CRNs. The research work on spectrum access in CRNs can be categorized into two phases. The first phase is MAC protocol design itself, which aims at proposing feasible schemes to make CRNs access spectrum more efficiently [2–4].
We denote it as No aggregation in our numerical results presented later. 3 CTMC Models for the Channel Aggregation Strategies To model different strategies, we develop CTMCs by assuming that the service arrivals of SUs and PUs to these channels are Poisson processes with arrival rates λS and λP respectively. Correspondingly, the service times are exponentially distributed with service rates μS and μP in one channel. The newly arrived PU services will access channels that are not occupied by PU services with the same probability.
NETWORKING 2011 Workshops: International IFIP TC 6 Workshops, PE-CRN, NC-Pro, WCNS, and SUNSET 2011, Held at NETWORKING 2011, Valencia, Spain, May 13, 2011, Revised Selected Papers by Attahiru S. Alfa, Vicent Pla, Jorge Martinez-Bauset, Vicente Casares-Giner (auth.), Vicente Casares-Giner, Pietro Manzoni, Ana Pont (eds.)