Date Added: Mar 2012
The authors consider a time slotted cognitive radio network under Rayleigh fading where multiple Secondary Users (SUs) contend for spectrum usage over available primary users' channels. They analyze the performance of a channel access policy where each SU stochastically determines whether to access a wireless channel or not based on a given access probability. In the analysis, they focus on the queueing performance of an arbitrary SU with the channel access policy. To improve the queueing performance of SUs, the access probability in their channel access policy is adapted to the knowledge on the wireless channel information, e.g., the number of available channels and the non-fading probability of channels.