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  • Research Article
  • Open Access

Admission Control and Interference Management in Dynamic Spectrum Access Networks

  • 1Email author,
  • 1,
  • 1 and
  • 1
EURASIP Journal on Wireless Communications and Networking20102010:708029

  • Received: 6 October 2009
  • Accepted: 9 May 2010
  • Published:


We study two important aspects to make dynamic spectrum access work in practice: the admission policy of secondary users (SUs) to achieve a certain degree of quality of service and the management of the interference caused by SUs to primary users (PUs). In order to limit the forced termination probability of SUs, we evaluate the Fractional Guard Channel reservation scheme to give priority to spectrum handovers over new arrivals. We show that, contrary to what has been proposed, the throughput of SUs cannot be maximized by configuring the reservation parameter. We also study the interference caused by SUs to PUs. We propose and evaluate different mechanisms to reduce the interference, which are based on simple spectrum access algorithms for both PUs and SUs and channel repacking algorithms for SUs. Numerical results show that the reduction can be of one order of magnitude or more with respect to the random access case. Finally, we propose an adaptive admission control scheme that is able to limit simultaneously the forced termination probability of SUs and what we define as the probability of interference. Our scheme does not require any configuration parameters beyond the probability objectives. Besides, it is simple to implement and it can operate with any arrival process and distribution of the session duration.


  • Primary User
  • Admission Control
  • Secondary User
  • Dynamic Spectrum Access
  • Admission Policy

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Authors’ Affiliations

Departamento de Comunicaciones, Universidad Politécnica de Valencia (UPV), Camino de Vera s/n, 46022 Valencia, Spain


© Jorge Martinez-Bauset et al. 2010

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.