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Energy Efficient Power Control and Resource Allocation in Downlink OFDMA HetNets with CrossTier Interference Constraint
Guodong ZHANG Wei HENG Jinming HU Tian LIANG
Publication
IEICE TRANSACTIONS on Communications
Vol.E99B
No.7
pp.15991608 Publication Date: 2016/07/01 Online ISSN: 17451345
DOI: 10.1587/transcom.2015EBP3436 Type of Manuscript: PAPER Category: Terrestrial Wireless Communication/Broadcasting Technologies Keyword: HetNets, crosstier interference constraint, GDA, EE, fairness, global EE,
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Summary:
Heterogeneous network (HetNet) is now considered to be a promising technique for enhancing the coverage and reducing the transmit power consumption of the next 5G system. Deploying small cells such as femtocells in the current macrocell networks achieves great spatial reuse at the cost of severe crosstier interference from concurrent transmission. In this situation, two novel energy efficient power control and resource allocation schemes in terms of energy efficiency (EE)fairness and EEmaximum, respectively, are investigated in this paper. In the EEfairness scheme, we aim to maximize the minimum EE of the femtocell base stations (FBSs). Generalized Dinkelbach's algorithm (GDA) is utilized to tackle this optimization problem and a distributed algorithm is proposed to solve the subproblem in GDA with limited intercell coordination, in which only a few scalars are shared among FBSs. In the EEmaximum scheme, we aim to maximize the global EE of all femtocells which is defined as the aggregate capacity over the aggregate power consumption in the femtocell networks. Leveraged by means of the lowerbound of logarithmic function, a centralized algorithm with limited computational complexity is proposed to solve the global EE maximization problem. Simulation results show that the proposed algorithms outperform previous schemes in terms of the minimum EE, fairness and global EE.

