Inter-operator interference coordination for co-primary spectrum sharing in UDN

Co-primary spectrum sharing for multiple operators has been utilized to fully explore the spectrum resources and thus improve the spectrum efficiency. The inter-operator interference (MI) problem should be seriously considered in order to achieve the mentioned target, especially under the scenario of the ultra-dense network (UDN) in the fifth generation (5G) wireless systems. To solve this problem, we propose an asymmetrical power levels based soft KA coordination mechanism. The shared spectrum pool is consisted of three separated parts, where each part can be dynamically adjusted according to the minimal spectrum demand from each operator. Furthermore, different power masks are configured to different parts for each operator. The simulation results show that the proposed mechanism can improve the network spectrum efficiency significantly.