Improving Communication Performance in High-mobility Environments by Millimeter-wave Base Station Cooperation for 5G evolution

Abstract

Although the 5th-generation mobile communications system (5G) commercial services are now being provided, further evolution of 5G is needed to meet a variety of future demands. As part of these studies, we consider the provision of millimeter-wave high-speed communications over a wide area to multiple mobile stations traveling at high speed. In a high-mobility environment, area construction must be performed over a wide area through the cooperation of multiple base stations. Additionally, to achieve simultaneous communications with multiple mobile stations, interference must be suppressed so that signals transmitted to each mobile station do not interfere with each other. To deal with these issues, we developed millimeter-wave base station cooperation technology to enable multiple base stations to cooperate with each other while suppressing inter-mobile-station interference by applying digital beamforming to base stations to generate and control beams by digital signal processing. We showed through outdoor experimental trials that high communication speeds could be achieved over a wide area.

Trends and Target Implementations for 5G evolution & 6G

“…Although this article has skimmed over the details of each technical area, discussions of related research and development activities can be found elsewhere in this issue [7][8][9].…”