Institute of Electrical & Electronic Engineers
3GPP LTE networks can provide a higher capacity by adopting advanced physical layer techniques and serve users with different Quality of Service (QoS) requirements. However, unbalanced user distributions and strong Inter-Cell Interference (ICI) still deteriorate network performances severely. Since Fractional Frequency Reuse (FFR) technique is recommended to mitigate ICI, the authors investigate the load balancing problem in a 3GPP LTE multi-cell FFR network with heterogeneous services in this paper. Firstly, they formulate a multi-objective optimization problem, whose objectives are intra- and inter-cell load balancing index for users with QoS requirements and total utility function for users without QoS requirements.