Cooperative Game in Dynamic Spectrum Access With Unknown Model and Imperfect Sensing
The authors consider dynamic spectrum access where distributed secondary users search for spectrum opportunities without knowing the primary traffic statistics. In each slot, a secondary transmitter chooses one channel to sense and subsequently transmit if the channel is sensed as idle. Sensing is imperfect, i.e., an idle channel may be sensed as busy and vice versa. Without centralized control, each secondary user needs to independently identify the channels that offer the most opportunities while avoiding collisions with both primary and other secondary users. They address the problem within a cooperative game framework, where the objective is to maximize the throughput of the secondary network under a constraint on the collision with the primary system.