Joint Precoding and Load Balancing Optimization for Energy-Efficient Heterogeneous Networks

This paper considers a downlink heterogeneous network, where different types of multiantenna base stations (BSs) communicate with a number of single-antenna users. Multiple BSs can serve the users by spatial multiflow transmission techniques. Assuming imperfect channel state information at both BSs...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2015-10, Vol.14 (10), p.5810-5822
Main Authors: Jingya Li, Bjornson, Emil, Svensson, Tommy, Eriksson, Thomas, Debbah, Merouane
Format: Article
Language:English
Subjects:
Approximation
Channels
Energy efficiency
Engineering Sciences
heterogeneous networks
Interference
Joints
load balancing
Load balancing (computing)
Load management
Mathematics
Networks
Optimization
Power demand
precoding design
Quality of service
Radio equipment
Signal to noise ratio
Stations
Statistics
Wireless communication
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Summary:This paper considers a downlink heterogeneous network, where different types of multiantenna base stations (BSs) communicate with a number of single-antenna users. Multiple BSs can serve the users by spatial multiflow transmission techniques. Assuming imperfect channel state information at both BSs and users, the precoding, load balancing, and BS operation mode are jointly optimized for improving the network energy efficiency. We minimize the weighted total power consumption while satisfying quality-of-service constraints at the users. This problem is nonconvex, but we prove that for each BS mode combination, the considered problem has a hidden convexity structure. Thus, the optimal solution is obtained by an exhaustive search over all possible BS mode combinations. Furthermore, by iterative convex approximations of the nonconvex objective function, a heuristic algorithm is proposed to obtain a suboptimal solution of low complexity. We show that although multicell joint transmission is allowed, in most cases, it is optimal for each user to be served by a single BS. The optimal BS association condition is parameterized, which reveals how it is impacted by different system parameters. Simulation results indicate that putting a BS into sleep mode by proper load balancing is an important solution for energy savings.
ISSN:1536-1276
1558-2248
1558-2248
DOI:10.1109/TWC.2015.2443044