Interference Coordination Based on Partial Frequency Band Random Allocation in LTE-Advanced HetNet for Internet of Things

Due to its high data rate support and other salient features, LTE-Advanced (LTE-A) has been chosen as a promising technology for Internet of Things with billions of devices being connected and managed. Sufficient frequency resource and appropriate interference coordination techniques are eagerly needed to accommodate the network requirements. In this paper, to deal with the inter-cell interference (ICIC) in the Macro base station (MBS)-Pico base station (PBS) scenario of LTE-A heterogeneous network (HetNet), a modified ICIC scheme with randomly occupying partial frequency band is proposed, which is developed from frequency division multiplexing (FDM) ICIC scheme. On the basis of that MBSs and PBSs mainly use the orthogonal frequency resources, let them could use each other´s main frequency resources randomly with a certain probability, thus the frequency resources could be used more sufficiently at the cost of introducing some interferences. Furthermore, the optimized values of probabilities, with which MBSs and PBSs randomly occupy each other´s frequency resources, are calculated to maximize the system average throughput. The simulation results show that the proposed scheme could obtain above 40% gain in terms of the average spectral efficiency, compared with the traditional FDM ICIC scheme.