Date Added: Jan 2011
In this paper, the authors develop an opportunistic spectrum scheduling scheme for multi-channel cognitive radio networks. In the proposed scheme, the primary user activity and channel quality (SNR at the receiving secondary user) vary on a slot-by-slot basis. The scheduling is performed at the beginning of the frame which consists of multiple slots. The scheduling algorithm estimates the expected number of packets which can be transmitted over the frame by each secondary user for each licensed channel. They present a Markov chain formulation to calculate the expected number of packets which can be transmitted over the frame for a secondary user corresponding to each licensed channel.