Energy efficiency - spectral efficiency optimization with distributed interference alignment strategies in 4G cellular networks and beyond

LTE-advanced and beyond cells are required to serve an increasing capacity despite their densification and small cells deployment. Tri-sectorial BS with full-reuse (1×3×1) is usually admitted, where each sector behaves as an independent cell, to maximize the user (UE) capacity as well as to simplify the tedious planning phase. As a consequence, the whole time-frequency OFDMA frame is exploitable by each cell but edge users in turns pay the most and suffer from strong interference. The global capacity is anyhow affected when homogeneous traffic is effective (uniform rate condition).