Interference Coordination in Femtocell Networks for QoS Performance Optimization

Heterogeneous networks with dense small cell deployment cause high inter-cell interference. To mitigate inter-cell interference, many interference coordination (IC) approaches have been proposed. For dense deployment with high interference among cells, traditional forward link IC approaches target on improving edge user throughput for infinite buffer traffic (i.e., FTP download), not necessarily improve QoS performance for delay sensitive (i.e., VOIP) traffic. This research proposes dynamic centralized interference coordination approaches called utility-based SFR (USFR) and utility-based PFR approach (UPFR), to improve forward link performance for both infinite buffer and delay sensitive traffic on dense deployed Enterprise LTE femtocell networks. The cell throughput and user cell edge throughput of infinite buffer traffic, packet loss rate (PLR) of VOIP traffic, have been characterized and compared between proposed approaches and traditional approaches.