Voice Secondary User Call Prioritize Cognitive Radio Networks with Buffering

In this paper, a new dynamic access scheme is proposed which differentiates secondary users (SUs) on the basis of their type: voice or data call. A voice call is preferred over a data call in the paper. If a primary user (PU) wants to access the spectrum, then a SU with data call will be placed in buffer. If no SU with data call is accessing the spectrum, then one of the SU with voice call will give way for PU. The paper also uses elapsed time of SU calls in the buffer to allow the access of the spectrum. Comparison results shows that the buffering the SU data call significantly reduces the SU blocking probability of voice calls and non-completion probability with very minor increased forced termination probability. However, it leads to delay in data call SU completion.