Overlay secondary spectrum sharing with independent re-attempts in cognitive radios

Muthukrishnan Senthil Kumar, Aresh Dadlani, Kiseon Kim, Richard O. Afolabi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Opportunistic spectrum access (OSA) is a promising reform paradigm envisioned to address the issue of spectrum scarcity in cognitive radio networks (CRNs). While current models consider various aspects of the OSA scheme, the impact of retrial phenomenon in multi-channel CRNs has not yet been analyzed. In this work, we present a continuous-time Markov chain (CTMC) model in which the blocked/preempted secondary users (SUs) enter a finite retrial group (or orbit) and re-attempt independently for service in an exponentially distributed random manner. Taking into account the inherent retrial tendency of SUs, we numerically assess the performance of the proposed scheme in terms of dropping probability and throughput of SUs.

Original languageEnglish
Title of host publication37th IEEE Sarnoff Symposium, Sarnoff 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781509015405
Publication statusPublished - Feb 7 2017
Externally publishedYes
Event37th IEEE Sarnoff Symposium, Sarnoff 2016 - Newark, United States
Duration: Sep 19 2016Sep 21 2016


Conference37th IEEE Sarnoff Symposium, Sarnoff 2016
CountryUnited States

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture

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