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TKN Technical Report Series

Spectrum Efficient QoS Support for Secondary Users in Cognitive Radio Systems
Citation key willkomm09spectrum_efficient_qos
Author Willkomm, Daniel
Year 2009
Number TKN-09-008
Month December
Institution Telecommunication Networks Group, Technische Universität Berlin
Abstract The fundamental performance criterion for Dynamic Spectrum Access (DSA) approaches is the protection of the Primary User (PU). However, for DSA to become a reality, it is crucial to also ensure some Quality of Service (QoS) support for the Secondary User (SU) commu- nication. In this paper, we propose sensing based opportunistic spectrum access approaches achieving both, protection of the PU, as well as QoS support for the secondary communica- tion. Given the requirements of PU protection and secondary QoS support, we show that there is a tradeoff between the spectral overhead needed to achieve both requirements. PU protection is realized by a sensing process, for which the amount of spectral overhead drives the probability of false positives (the probability of declaring the PU to be present although it is not). This probability in turn in uences the amount of spectral overhead required for secondary QoS support. We introduce performance metrics to quantify the spectral overhead and the spectral efficiency of DSA approaches. Furthermore, for a secondary QoS metric of uninterrupted data transmission, we show performance results for selected link maintenance approaches with respect to their spectral efficiency.
Bibtex Type of Publication TKN Technical Report Series
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