Introduction -- Sustainable Ultra-Dense Heterogeneous Networks -- Non-Orthogonal Multiple Access: Achieving Sustainable Future Radio Access -- Space-Time Network Coding with TAS -- Space-Time Network Coding with Antenna Selection -- Compressive Sensing Based Dynamic Estimation -- Energy-Efficient Power Control for D2D Communications -- Energy-Efficient Resource Allocation in Heterogeneous OFDMA Networks -- Energy-Efficient User Scheduling and Power Control for Multi-Cell OFDMA Networks based on CDI -- Energy-Efficient Base Station Association and Beamforming for Multi-Cell Multiuser Systems -- Summary.