One-shot games for spectrum sharing among co-located radio access networks

We consider an adaptive co-primary spectrum sharing scheme based on playing one-shot games between co-located distributed Radio Access Networks (RANs). Spectrum is divided into private and shared parts, and each RAN internally applies coordinated multi-point transmissions. Zero-forcing precoding is used in the private part, while unitary precoding is applied in the non-orthogonally shared part. A one-shot game is played such that each operator proposes a spectrum partition which maximizes its own sum utility, and the actual spectrum partition is resolved based on a priori decision rules that reflect the regulatory framework. Thus, adaptive spectrum sharing can be implemented with a minimal exchange of signaling information among operators. The existence of a unique Nash-equilibrium is shown for the game. Simulation results show that adaptive spectrum sharing is able to bridge between the baseline performance of orthogonal and full (non-orthogonal) spectrum in different signal-to-noise power ratio regions.