Performance Simulation of Non-reliable Servers in Finite-Source Cognitive Radio Networks with Collision

  • Hamza Nemouchi
  • Janos SztrikEmail author
Conference paper
Part of the Communications in Computer and Information Science book series (CCIS, volume 800)


This paper introduces a finite-source retrial queueing system which models cognitive radio networks. We assume two non-independent frequency bands servicing two classes of users: Primary Users (PUs) and Secondary Users (SUs). A service unit with a priority queue and another service unit with an orbit are assigned to the PUs and SUs, respectively.

In this work, we focus on the non-reliability of the servers and the collisions at the secondary servers. The primary and secondary servers are subject to random breakdowns and repairs. A collision is introduced at the retrial part of the cognitive radio network. This conflict invokes the interruption of a servicing packet when a new arriving call requests the server unit.

The novelty of the investigation is the non-reliability of servers and the inclusion of conflicts at the secondary server.

By the use of simulation, we analyze the effect of the non-reliability of the servers on the mean response time of the secondary users.


Finite source queuing systems Simulation Cognitive Radio Networks Performance and reliability measures Collision Non-reliable servers 



The work of Nemouchi H. was supported by the Stipendium Hungaricum Scholarship.


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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Faculty of InformaticsUniversity of DebrecenDebrecenHungary

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