Conclusions and Future Directions

Abstract

The objective of this Brief is to study the voice capacity of CRNs and the mean response time of elastic/interactive data traffic over the CRNs with different service processes. As there is an uncertainty in spectrum resource availability, rather than a strict delay requirement, a stochastic delay requirement is considered as the main QoS parameter for voice capacity analysis. For data applications, we have shown that the variations of the mean channel available/non-available durations have a significant impact on the mean response time even when the mean channel availability is constant. Therefore, the mean response time evaluations based on the mean channel availability are not suitable in the context of the CRNs. We have obtained a relationship between the mean response times of elastic data traffic and interactive data traffic under the Poisson approximation of the request arrivals at the base station, which can be used for QoS provisioning in Web traffic over CRNs.