Coordinated 3D Beamforming for Interference Management in Cellular Networks
Journal article, 2014

We consider downlink transmission in a cellular network consisting of multi-antenna base stations (BSs), single-antenna mobile users, directional antennas each with a vertically adjustable beam, and control signaling delays in feedback and backhaul links. We propose a novel transmission technique in which intercell interference management is performed via coordinating the beamforming jointly in the horizontal and vertical planes of the wireless channel, denoted as coordinated 3D beamforming. In the horizontal plane, we focus on intercell interference cancelation (ICIC) and investigate its performance when the provided channel state information (CSI) is impaired due to delay/mobility. It is demonstrated that the superiority of ICIC over conventional intracell maximum ratio transmission is highly dependent on the CSI accuracy. In the vertical plane, we consider intercell interference control via coordinatively adapting the elevation angle of the BS antenna pattern, denoted as tilt, to the locations of the scheduled users. It is shown that with perfect CSI interference management should be performed in the horizontal plane using ICIC, while at high delay/mobility it should be done in the vertical plane via coordinated tilt adaptation. For intermediate values of delay/mobility, joint interference management in both planes is required.

base station coordination

Antenna tilt

channel state information (CSI) delay

interference management

3D beamforming


Nima Seifi


J. Zhang

Hong Kong University of Science and Technology

Robert W. Heath Jr.

The University of Texas at Austin

Tommy Svensson

Chalmers, Signals and Systems, Communication, Antennas and Optical Networks

Mikael Coldrey


IEEE Transactions on Wireless Communications

15361276 (ISSN) 15582248 (eISSN)

Vol. 13 10 5396-5410 2349981

Subject Categories


Communication Systems



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