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Hybrid inter-cell interference management for ultra-dense heterogeneous network in 5G

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Abstract

The Ultra-dense Heterogeneous Network (HetNet), which consists of macro-cells and pico-cells, has been recognized as a key technique to improve network performance. However, the increasing number of pico-cells also causes severe interference including inter-cell interference and intra-cell interference. Therefore, interference management has become an important issue in ultra-dense HetNets, and the traditional enhanced inter-cell interference coordination (eICIC) scheme is no longer fit for the high density of small cells. In this paper, a hybrid interference management method based on dynamic eICIC and coordinated multi-point transmission (CoMP) is proposed. Firstly, a virtual cell is established based on the characteristics of ultra dense HetNets. Then, a novel joint dynamic eICIC scheme combined with multi-user beamforming is deployed to eliminate the inter-cell interference, and improve the throughput of virtual cell significantly without sharp decrease of throughput of macro-cell. Furthermore, a virtual cell based joint transmission scheme is deployed with a power control algorithm, which can obviously increase the spectrum efficiency of virtual cell edge. Simulation results verify that the proposed scheme can achieve better spectrum efficiency both at macro-cell and virtual cell edges, and the network throughput is also improved.

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Correspondence to Qianbin Chen.

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Huang, C., Chen, Q. & Tang, L. Hybrid inter-cell interference management for ultra-dense heterogeneous network in 5G. Sci. China Inf. Sci. 59, 082305 (2016). https://doi.org/10.1007/s11432-016-5556-2

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Keywords

  • interference management
  • coordinated multi-point transmission
  • ultra dense network
  • almost blank subframe
  • spectrum efficiency