Randomized Multi-User Strategy for Spectrum Sharing in Opportunistic Spectrum Access Network

In this paper, we consider the problem of opportunistic spectrum access (OSA) for multiple secondary users over multiple channels occupied by primary users whose occupancy state is modeled as discrete-time Markov Process. Taking collisions among secondary users into consideration, we develop a randomized strategy that allows secondary users to seek independently for spectrum opportunities without cooperation, while at the same time maximizing the spectrum utility of the whole system. Our proposed scheme can achieve higher total throughput for all secondary users with no additional message exchange when compared with other similar works. Additionally, our proposed strategy can easily incorporate the spectrum detector in physical layer and interference constraints set by primary users.