Energy Conservation via Antenna Scheduling in Fiber-Connected Femto Base Stations
We formulated the energy consumption of previously proposed broadband wireless access with fibre-connected massively distributed antennas (BWA-FMDA) architecture under a generalized framework and developed an optimization tool in a femtocell cluster based on coordinated multipoint transmission (femto-CoMP) to maximize energy efficiency by adjusting the number of transmission antennas and controlling transmission power in zero-forcing beamforming. Based on the analysis results, we group every two neighboring antennas in multiple femto-CoMP configurations and proposed a new network configuration scheme that uses antenna scheduling to simultaneously improve spectral and energy efficiency. Compared with standalone femtocells, the proposed scheme is shown in a typical office building to increase energy efficiency by 64%?~?160% and spectral efficiency by 2%?~?36%. Compared with our previous BWA-FMDA configurations, the new scheme is able to improve energy efficiency by 6%?~?68% and spectral efficiency by 15%?~?55%. The exact gain depends on network configurations and transmission power levels.
femtocell comp radio over fiber