IEEE International Conference on Communications (ICC)
Institute of Electrical and Electronics Engineers
Place of Publication
In cognitive radio networks, dynamic spectrumaccess is achieved by allowing secondary users (SUs) to probethe spectrum and utilize available channels opportunistically.Spectrum probing mechanisms should be efficient and fast toavoid harmful interference with primary users (PUs). Periodicprobing has been commonly adopted as a default spectrumprobing mechanism. In this paper, we attempt to study differentspectrum probing mechanisms and evaluate a performance metriccalled the probing delay, i.e., how quickly a probing mechanismcan detect a channel change. We find that randomization in theprobing strategy does affect the probing delay. Specifically, in theindependent sensing scenario, periodic probing indeed achievesthe smallest probing delay. In the cooperative sensing scenario,however, randomization can drastically reduce the probing delay.
dynamic spectrum access, cognitive radio
Digital Communications and Networking | Engineering | Systems and Communications
Chao Chen, Zesheng Chen, Todor Cooklev, and Carlos Pomalaza-Ráez (2010).
On Spectrum Probing in Cognitive Radio Networks: Does Randomization Matter. IEEE International Conference on Communications (ICC). United States: Institute of Electrical and Electronics Engineers.