Joint Optimization of Parameters for Enhanced Inter-Cell Interference Coordination (eICIC) in LTE-A HetNets

Yanzan SUN  Zhijuan WANG  Tao WANG  Yating WU  Yong FANG  

IEICE TRANSACTIONS on Communications   Vol.E100-B   No.5   pp.799-807
Publication Date: 2017/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016EBP3166
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
HetNet,  eICIC,  ABS,  CRE,  ABS power,  

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LTE-Advanced heterogeneous networks (HetNets), consisting of conventional Macrocells overlaid by Picocells and forming a hierarchical cell structure, constitute an attractive way of improving the Macrocell capacity and coverage. However, the inter-tier interferences in such systems can significantly reduce the capacity and cause unacceptably high levels of control channel outage. Thus time domain Enhanced Inter-cell Interference Coordination (eICIC), such as almost blank subframe (ABS) and cell range expansion (CRE) techniques, has been proposed to mitigate the interference and improve the system capacity in HetNets. In order to acquire the benefit of eICIC technology efficiently, the three parameters, i.e. ABS ratio, ABS power and CRE bias, should be carefully configured jointly. Motivated by the above considerations, we first propose a single parameter optimization algorithm that fixes the other two parameters and then optimizes them separately. Then, a heuristic joint parameter optimization algorithm is proposed to maximize the system throughput. Extensive simulation results illustrate that the proposed algorithms clearly outperform the fixed parameter configuration, and is close to that of the traversal search algorithm even though they have lower computation complexity