Price-Based Resource Allocation in Cooperative Cognitive Wireless Powered Communication Networks

We consider a multicarrier cooperative cognitive wireless powered communication network consisting of multiple secondary users (SUs) communicating to a cognitive base station (CBS), in the presence of a wireless powered primary user (PU). The transmission time is divided into two phases, where the first phase is for the SUs transmitting information bearing signals to the CBS while the PU harvesting energy from these RF signals, and the second phase is for PU transmission. It is assumed that the PU prices the interference energy from the SUs caused to the PU. We model the interaction between the SUs and the PU as a Stackelberg game. Specifically, the SUs act as followers which determine their transmit powers in the first phase, while the PU acts as a leader which determines the transmit power of the PU in the second phase, the subcarrier allocation in the first phase, the prices charged to the SUs, and the time allocation. An algorithm is proposed to achieve the Stackelberg equilibrium. The effectiveness of the proposed algorithm is verified by simulation results.