Abstract
5G introduces massive multiple-input multiple-output (M-MIMO) with analog beamforming (BF) in millimeter-wave (mmW) bands. 5G Evolution (5GE), which will be actualized around 2025, is expected to replace analog BF with hybrid or fully digital BF that can improve mmW-band downlink and uplink transmission performances. In addition, base station (BS) cooperation technologies are required for 5GE to provide stable and reliable cell-edge transmission in the mmW bands, even when mobile stations (MSs) travel at high speed. This paper introduces our developed 28 GHz-band trial equipment employing our proposed BS cooperation technologies with digital BF and distributed MIMO. It also shows evaluation results of outdoor experimental trials at two MSs' velocity of 90 km/h. Three M-MIMO antennas are deployed in the trials, and the BS cooperation selects one M-MIMO antenna instantly or performs BS cooperative transmission. It is verified that the BS cooperation can improve areal throughput and maintain high throughput in a wider area than non-BS cooperation.
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