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001-es BibID:	BIBFORM071719
Első szerző:	Nemouchi, Hamza
Cím:	Performance simulation of finite-source cognitive radio networks with servers subject to breakdowns and repairs / H. Nemouchi, J. Sztrik
Dátum:	2017
Megjegyzések:	The present paper deals with the performance evaluation of a cognitive radio network by the help of a queueing model. The queueing system contains of two interconnected, not independent sub-systems. The first part is for the requests of the Primary Units (PU). The number of sources is finite and each source generates high priority requests after a generally distributed time. The requests are sent to a single server unit or Primary Channel Service (PCS) with preemptive priority queue. The service times are supposed to be also generally distributed. The second part is for the requests of the Secondary Units (SU). There are finite sources, too, the inter-request times and service times of the single server unit or Secondary Channel Service (SCS) are assumed to be generally distributed, respectively. A generated high priority packet goes to the primary service unit. If the unit is idle, the service of the packet begins immediately. If the server is busy with a high priority request, the packet joins the preemptive priority queue. When the unit is engaged with a request from SUs, the service is interrupted and the interrupted low priority task is sent back to the SCS. Depending on the state of secondary channel the interrupted job is directed to either the server or the orbit. In case of requests from SUs if the SCS is idle, the service starts, if the SCS is busy, the packet looks for the PCS. In case of an idle PCS, the service of the low priority packet begins at the high priority channel (PCS). If the PCS is busy the packet goes to the orbit. From the orbit it retries to be served after a generally distributed time. The novelty of our investigation is that each server is subject to random breakdowns in which case the interrupted request is send to the queue or orbit, respectively. The operating and repair times of the servers are supposed to be generally distributed. Finally, all the random times included in the model construction are assumed to be independent of each other. The main aim of the paper is to analyze the effect of the non-reliability of the servers on the mean and variance of the response time for the SUs by using simulation.
Tárgyszavak:	Műszaki tudományok Informatikai tudományok előadáskivonat könyvrészlet
Megjelenés:	XXXIV. International Seminar on Stability Problems for Stochastic Models 25-29 August 2017 Debrecen, Hungary : Book of abstracts. - p. 71.
További szerzők:	Sztrik János (1953-) (informatikus, matematikus)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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