Efficient QoS Support for Secondary Users in Cognitive Radio Systems

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Executive Summary

The fundamental condition for the legal approval of Dynamic Spectrum Access (DSA) approaches is the protection of the Primary User (PU). However, for DSA to become an attractive service reality, it is crucial to ensure also some Quality of Service (QoS) support for the Secondary User (SU) communication. In this paper, the authors discuss sensing based opportunistic spectrum access approaches, in which PU protection is achieved by a properly organized sensing process and SU communication reconfiguration. While the required reliability of the sensing process can be expressed in terms of rarely enough overlooking the PU, they assume that the proper QoS for the SU is given by maintaining - with a given confidence level - minimum bandwidth availability for the SU in spite of PU dynamics.

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