International Conference on Emerging Technologies for Communications


Session Number:B4



28 GHz-Band Outdoor Experimental Trials of Base Station Cooperation with Digital BF in High-Mobility Environments

Tatsuki Okuyama,  Nobuhide Nonaka,  Satoshi Suyama,  Yukihiko Okumura,  Takahiro Asai,  


Publication Date:2020/12/2

Online ISSN:2188-5079


PDF download


The fifth-generation (5G) mobile communications system initially introduced massive multiple-input multiple-output (M-MIMO) with analog beamforming (BF) to compensate for the larger path-loss in millimeter-wave (mmW) bands. 5G Evolution (5GE), which should be actualized around 2025, will replace analog BF with hybrid or fully digital BF that improves the mmW-band downlink/uplink transmission performance. In addition, 5GE requires base station (BS) cooperation technologies 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 a BS cooperation technology with digital BF to track the MS mobility. We present evaluation results of outdoor experimental trials at a maximum MS velocity of 120 km/h. Two M-MIMO antennas are deployed in the trials, and the BS cooperation selects one M-MIMO antenna based on the maximum received power criterion of a reference signal transmitted by the MS. The trials clarify that the BS cooperation maintains the maximum throughput in a wider area than non-BS cooperation at 120 km/h.