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Cognitive Radio Networks (CRNs) have emerged as a promising solution to spectrum under-utilization and congestion. Supporting Quality of Service (QoS) aware services over CRNs is always challenging due to the randomness of the spectrum availability. In this paper, the authors consider a set of fully-connected cognitive radios (secondary users) operating over a time-slotted primary network, accessing the channel at the spectrum holes without interfering with primary users. As the capacity analysis is one of the basic steps to guarantee QoS, they analyze the on-off voice capacity of single-channel single-hop fully-connected CRNs under distributed channel access control.
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