Spectrum Map Empowered Resource Management for QoS Guarantees in Multi-Tier Cellular Networks
Deploying picocells overlaying Macrocells as the second tier has been regarded as a promising approach to enhance the spectrum efficiency and thus high data rate services, but only if cross-tier interference can be effectively controlled. Since both tiers shall support considerable numbers of users, interference mitigation by centralized/collaborated radio resource allocation among two tiers is infeasible. The cognitive radio is consequently a potential technology for autonomous interference mitigation. However, the obstacle of applying cognitive radio to the picocell is an unacceptable amount of feedback of channel sensing results from users. To tackle this critical challenge, the authors propose the Spectrum Map Resource Management (SMRM) for picocells.