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Optimal Design of Energy-Efficient HetNets: Joint Precoding and Load Balancing

Jingya Li (Institutionen för signaler och system, Kommunikationssystem) ; Emil Bjönson ; Tommy Svensson (Institutionen för signaler och system, Kommunikationssystem) ; Thomas Eriksson (Institutionen för signaler och system, Kommunikationssystem) ; Mérouane DEBBAH
IEEE International Conference on Communications, ICC 2015, London, United Kingdom, 8-12 June 2015 (1550-3607). p. 4664-4669. (2015)
[Konferensbidrag, refereegranskat]

This paper considers the downlink of a heterogeneous network, where multiple base stations (BSs) can serve the users by non-coherent multiflow beamforming. We assume imperfect channel state information at both BSs and users. The objective is to jointly optimize the precoding, load balancing, and BS operation mode (active or sleep) for improving the energy efficiency of the network. The considered problem is to minimize the weighted total power consumption (both circuit power and dynamic transmit power), while satisfying per-user quality of service constraints and per-BS transmit power constraints. This problem is non-convex, but we prove that for each combination of BS modes, the considered problem has a hidden convexity structure. Thus, the global optimal solution is obtained by an exhaustive search over all possible BS mode combinations. Furthermore, by iterative convex approximations of the non-convex power consumption functions, a heuristic algorithm is proposed to obtain a local optimal solution with low complexity. Simulation results illustrate that our proposed algorithms significantly reduce the total power consumption, compared to the scheme where all BSs are continuously active. This implies that putting a BS into sleep mode by proper load balancing is an important solution for energy savings in heterogeneous networks.



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Denna post skapades 2015-01-15. Senast ändrad 2016-04-28.
CPL Pubid: 210848

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Kommunikationssystem (1900-2017)

Ämnesområden

Informations- och kommunikationsteknik
Kommunikationssystem
Telekommunikationsteori
Signalbehandling

Chalmers infrastruktur

C3SE/SNIC (Chalmers Centre for Computational Science and Engineering)