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In opportunistic channel access, the user needs to make real time decisions on when and which channel to access with uncertainty. Assuming perfect channel statistics, several studies have applied optimal stopping theory to derive control strategy for sequential sensing/probing based opportunistically accessing (<bold>s</bold>-SPA), exploiting temporary opportunities among multiple channels...
In this work, we address the spectrum utilization problem in cognitive radio networks. The difficulty of the problem comes from the need to balance exploring new channels and exploiting existing channel, and the fact that the channel availability and channel quality, which are potentially heterogeneous and time-dependent, are unknown or hard to know for CRs due to the large number of channels and...
In this paper, we consider sequential channel sensing and accessing with unknown channel availability probabilities. In such sequential channel sensing framework, it is critical important to arrange the channel sensing order properly at the beginning of each time slot, so as to balance the tradeoff between finding an idle channel as soon as possible in current slot (exploitation by sensing currently...
A critical challenge in Cognitive Radio Networks (CRN) is to make decision in real-time on accessing and releasing available channels that maximize the spectrum utilization and the overall system throughput. In this work, we make investigations on optimal action point to explore and exploit the frequency-temporal diversity in addition to spectrum availability. By modeling the Rayleigh fading channel...
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