System Times and Channel Availability for Secondary Transmissions in CRNs: A Dependability Theory based Analysis
| Autor: | Vicent Pla, Frank Y. Li, Indika A. M. Balapuwaduge |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Reliability theory
Computer Networks and Communications Computer science Aerospace Engineering 02 engineering and technology Communications system 0203 mechanical engineering 0202 electrical engineering electronic engineering information engineering Dependability Cognitive radio networks (CRNs) Resource management Electrical and Electronic Engineering Spectrum access Markov chain Cumulative distribution function Guaranteed availability 020206 networking & telecommunications 020302 automobile design & engineering INGENIERIA TELEMATICA Uniformization (probability theory) System times Reliability engineering Cognitive radio Channel availability Automotive Engineering Continuous-time Markov chains (CTMCs) Unavailability Communication channel |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | [EN] Reliability is of fundamental importance for the performance of secondary networks in cognitive radio networks (CRNs). To date, most studies have focused on predicting reliability parameters based on prior statistics of traffic patterns from user behavior. In this paper, we define a few reliability metrics for channel access in multichannel CRNs that are analogous to the concepts of reliability and availability in classical dependability theory. Continuous-time Markov chains are employed to model channel available and unavailable time intervals based on channel occupancy status. The impact on user access opportunities based on channel availability is investigated by analyzing the steady-state channel availability and several system times such as mean channel available time and mean time to first channel unavailability. Moreover, the complementary cumulative distribution function for channel availability is derived by applying the uniformization method, and it is evaluated as a measure of guaranteed availability for channel access by secondary users. The precision and the correctness of the derived analytical models are validated through discrete-event-based simulations. We believe that the reliability metric definitions and the analytical models proposed in this paper have their significance for reliability and availability analysis in CRNs. The work of V. Pla was supported by the Ministry of Economy and Competitiveness of Spain under Grant TIN2013-47272-C2-1-R. The review of this paper was coordinated by Dr. B. Canberk. |
| Databáze: | OpenAIRE |
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