Analysis and Optimization of Inter-Tier Interference Coordination in Downlink Multi-Antenna HetNets With Offloading

Heterogeneous networks (HetNets) with offloading is considered as an effective way to meet the high data rate demand of future wireless service. However, offloaded users suffer from strong inter-tier interference, which reduces the benefits of offloading and is one of the main limiting factors of sy...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2015-12, Vol.14 (12), p.6550-6564
Main Authors: Yueping Wu, Ying Cui, Clerckx, Bruno
Format: Article
Language:English
Subjects:
Antennas
Approximation methods
Constraining
Demand
Downlink
Economic models
Fading
Heterogeneous networks
inter-tier interference coordination
Interference
Mathematical analysis
Mathematical models
multiple antennas
Networks
offloading
Optimization
rate coverage probability
stochastic geometry
Wireless communication
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Summary:Heterogeneous networks (HetNets) with offloading is considered as an effective way to meet the high data rate demand of future wireless service. However, offloaded users suffer from strong inter-tier interference, which reduces the benefits of offloading and is one of the main limiting factors of system performance. In this paper, we investigate an interference nulling (IN) scheme in improving system performance by carefully managing the inter-tier interference to the offloaded users in downlink two-tier HetNets with multi-antenna base stations. Utilizing tools from stochastic geometry, we first derive a tractable expression for the rate coverage probability of the IN scheme. Then, by studying its order, we obtain the optimal design parameter, i.e., the degree of freedom that can be used for IN, to maximize the rate coverage probability. Finally, we analyze the rate coverage probabilities of the simple offloading scheme without interference management and the multi-antenna version of the almost blank subframes (ABS) scheme in 3GPP LTE, and compare the performance of the IN scheme with these two schemes. Both analytical and numerical results show that the IN scheme can achieve good performance gains over both of these two schemes, especially in the large antenna regime.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2015.2456174