Joint Optimization of FeICIC and Spectrum Allocation for Spectral and Energy Efficient Heterogeneous Networks

Xuefang NIE
Liqin DING
Jiliang ZHANG

IEICE TRANSACTIONS on Communications   Vol.E101-B    No.6    pp.1462-1475
Publication Date: 2018/06/01
Publicized: 2017/12/18
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3175
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
heterogeneous networks,  spectral efficiency,  energy efficiency,  spectrum allocation,  sleep mode,  FeICIC,  stochastic geometry,  

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Cellular heterogeneous networks (HetNets) with densely deployed small cells can effectively boost network capacity. The co-channel interference and the prominent energy consumption are two crucial issues in HetNets which need to be addressed. Taking the traffic variations into account, this paper proposes a theoretical framework to analyze spectral efficiency (SE) and energy efficiency (EE) considering jointly further-enhanced inter-cell interference coordination (FeICIC) and spectrum allocation (SA) via a stochastic geometric approach for a two-tier downlink HetNet. SE and EE are respectively derived and validated by Monte Carlo simulations. To create spectrum and energy efficient HetNets that can adapt to traffic demands, a non-convex optimization problem with the power control factor, resource partitioning fraction and number of subchannels for the SE and EE tradeoff is formulated, based on which, an iterative algorithm with low complexity is proposed to achieve the sub-optimal solution. Numerical results confirm the effectiveness of the joint FeICIC and SA scheme in HetNets. Meanwhile, a system design insight on resource allocation for the SE and EE tradeoff is provided.