International Journal of Engineering Trends and Technology
In this paper, the authors consider the problem of spectrum sharing among primary (or "Licensed") and secondary (or "Unlicensed") users. Specifically, multi-phase cooperation architecture is proposed including cooperation partner selection (Intermediate Users IUs) and spectrum sharing among Secondary Users (SUs). In this paper, they use an intelligent cluster-based cooperative spectrum sensing scheme, based on centralized energy and distance criteria, for the appropriate selection of IUs so that IUs communicate efficiently with the PU. Also, an energy efficient cluster based TDMA protocol is proposed for the communication between IUs and SUs.