QoS-Aware Joint Policies in Cognitive Radio Networks
One of the most challenging problems in Opportunistic Spectrum Access (OSA) is to design channel sensing-based protocol in multi Secondary Users (SUs) network. Quality of Service (QoS) requirements for SUs have significant implications on this protocol design. In this paper, the authors propose a new method to find joint policies for SUs which not only guarantees QoS requirements but also maximizes network throughput. They use Decentralized Partially Observable Markov Decision Process (Dec-POMDP) to formulate interactions between SUs. Meanwhile, a tractable approach for Dec-POMDP is utilized to extract sub-optimum joint policies for large horizons.