Joint Base Station Activation and Coordinated Downlink Beamforming for HetNets: Efficient Optimal and Suboptimal Algorithms

In cellular heterogeneous networks (HetNets), a number of distributed base stations cooperatively provide services to multiple mobile users. This paper addresses joint base-station activation and coordinated beamforming design for downlink transmission in HetNets. To this end, a mixed integer progra...

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Bibliographic Details
Published inIEEE transactions on vehicular technology Vol. 68; no. 4; pp. 3702 - 3712
Main Authors Bi, Siguo, Fang, Zhaoxi, Yuan, Xiaojun, Wang, Xin
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2019
Subjects
Array signal processing
base station activation
Base stations
Benders’ decomposition
Cellular heterogeneous networks
Complexity theory
coordinated transmission
Downlink
downlink beamforming
Heterogeneous networks
Interference
Power demand
subgradient method
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ISSN0018-9545
1939-9359
DOI10.1109/TVT.2019.2901064

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Summary:In cellular heterogeneous networks (HetNets), a number of distributed base stations cooperatively provide services to multiple mobile users. This paper addresses joint base-station activation and coordinated beamforming design for downlink transmission in HetNets. To this end, a mixed integer program is formulated to optimize the total power consumption of a HetNet. A novel approach based on Benders' decomposition is then put forth to obtain the optimal solution for the problem of interest with guaranteed convergence. Building on our new formulation, a dual-subgradient algorithm is also proposed to find an approximate solution in polynomial time. The proposed approaches can be generalized to more general setups, including robust beamforming designs under channel uncertainty, and coordinated beamforming for multi-cell scenarios.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2019.2901064