Field Experiments on Combination of Downlink CoMP and Smart Vertical MIMO in LTE-Advanced

This paper focuses on the combination of coordinated multipoint (CoMP) transmission and Smart Vertical (SV)-Multiple-Input Multiple-Output (MIMO) base station (BS) antenna in the LTE-Advanced downlink to analyze the synergy effect on the combination, so that it presents experimental results on the combination. We investigate the gain of CoMP joint transmission (JT) and dynamic point selection (DPS) compared to non-CoMP transmission, and install a SV-MIMO antenna as BS antennas. Field experiments, which are conducted in a urban and suburban area in Japan, show that the achievable user throughput of CoMP DPS is from 20 % to 180 % greater than that for non-CoMP transmission, and no remarkable difference between CoMP JT and CoMP DPS within 5% throughput. With implementing SV-MIMO BS antenna for combination of CoMP DPS, up to 180 % throughput gain is achieved compared to using the conventional BS antenna. Finally comparing the throughput performance over different tilt angle, there is not remarkable difference for CoMP DPS transmission in both urban and suburban area.