Non-Orthogonal Access with SIC Using Inter-Cell Interference Coordination Based on Coordinated Power Control for Cellular Uplink

Abstract

This paper comprehensively compares our two previously reported inter-cell interference coordination (ICIC) methods based on frequency block-dependent coordinated transmission power control (TPC) in non-orthogonal access with a successive interference canceller (SIC) in the cellular uplink. First ICIC method uses different target signal-to-noise ratios (SNRs) and compensation factors in fractional TPC (FTPC) among frequency blocks, which are coordinated among neighboring cells. Second ICIC method uses TPC based on inter-cell interference power in addition to the conventional received signal power-based FTPC, where the allowable inter-cell interference power among multiple frequency blocks within the system bandwidth are coordinated among neighboring cells. Based on computer simulation, we show that ICIC using either of our previously reported TPC methods enhances the system-level throughput compared to the conventional universal frequency reuse (UFR) without ICIC and fractional frequency reuse (FFR) since the proposed ICIC methods alleviate the degradation in multiuser diversity and the non-orthogonal user multiplexing effect compared to the conventional FFR, which achieves a similar ICIC effect. Between the two previous ICIC methods, the ICIC method using TPC based on inter-cell interference power achieves the best throughput performance.