28 GHz-Band Experimental Trial at 283 km/h Using the Shinkansen for 5G Evolution
Nobuhide Nonaka, Kazushi Muraoka, Tatsuki Okuyama, Satoshi Suyama, Yukihiko Okumura, Takahiro Asai, Yoshihiro Matsumura
Abstract
To enhance 5G (5G Evolution) further, more stable high bit-rate transmission using high SHF bands including 28 GHz or EHF bands is provided even in high-mobility environments such as in high-speed trains. However, in future 5G use cases in the Shinkansen, a dynamic changes in the beam direction and a greater Doppler frequency shift may cause performance degradation in 28 GHz-band transmission. Thus, we conduct a 28-GHz band 5G experimental trial on an actual Shinkansen that runs at a maximum speed of 283 km/h. This paper introduces the world's first 28 GHz band 5G experimental system used in a 5G experimental trial in the Shinkansen travelling over 200 km/h. We detail the experimental configuration in which three base stations are deployed along the Tokaido Shinkansen railway with a mobile station located in the train. This paper also presents the downlink transmission performance measured in such a high-mobility environment. The experimental trial can achieve throughput exceeding 1.0 Gbps and consecutive handovers among the three BSs.