Time domain coordination for inter-cell interference reduction in LTE hierarchical cellular systems

In this paper, we present an interference-aware slot allocation technique to improve system performance of the hierarchical picocell/macrocell system, where low-power picocells are underlying a high-power macrocell. Although a hierarchical picocell/macrocell system can improve capacity, it also poses a challenging inter-cell interference (ICI) issue. To control the ICI between pico-cells and macro-cells, one enhanced inter-cell interference coordination (eICIC) technique, called almost blank subframes (ABS), was proposed in the 3rd Generation Partnership Project (3GPP) Long-Term Evolution-Advanced (LTE-A) system. Nevertheless, the current ABS mechanism in 3GPP only defines the fixed ABS ratio, which is not very spectrum efficient and can affect the macrocellular system performance. In this paper, we propose an interference-aware ABS ratio adaptation technique to enhance the total spectrum efficiency of the hierarchical picocell/macrocell system. Compared with the current fixed ABS ratio approach, the proposed method can improve the spectral efficiency of pico-cells and macro-cells by 13% and 7% at the cell edge, respectively.

[1]  Ashwin Sampath,et al.  Cell Association and Interference Coordination in Heterogeneous LTE-A Cellular Networks , 2010, IEEE Journal on Selected Areas in Communications.

[2]  Stefania Sesia,et al.  LTE - The UMTS Long Term Evolution, Second Edition , 2011 .

[3]  Krishna Balachandran,et al.  Cell Selection with Downlink Resource Partitioning in Heterogeneous Networks , 2011, 2011 IEEE International Conference on Communications Workshops (ICC).

[4]  Naga Bhushan,et al.  LTE-Advanced: Heterogeneous networks , 2010, 2010 European Wireless Conference (EW).

[5]  András Rácz,et al.  Intercell Interference Coordination in OFDMA Networks and in the 3GPP Long Term Evolution System , 2009, J. Commun..

[6]  Volker Pauli.  Inter-Cell Interference Coordination for LTE-A , 2011 .

[7]  Hirotaka Sato,et al.  Pico Cell Range Expansion with Interference Mitigation toward LTE-Advanced Heterogeneous Networks , 2011, 2011 IEEE International Conference on Communications Workshops (ICC).

[8]  Yongbin Wei,et al.  Downlink FTP Performance of Heterogeneous Networks for LTE-Advanced , 2011, 2011 IEEE International Conference on Communications Workshops (ICC).

[9]  Raj Jain,et al.  A Quantitative Measure Of Fairness And Discrimination For Resource Allocation In Shared Computer Systems , 1998, ArXiv.

[10]  Philippe Godin,et al.  Additional Features of LTE Release 10 , 2011, LTE - The UMTS Long Term Evolution.

[11]  Yongbin Wei,et al.  Coordinated downlink multi-point communications in heterogeneous cellular networks , 2012, 2012 Information Theory and Applications Workshop.