Japan, May 25 -- NTT, Inc., Kubota Corporation, and NTT DOCOMO, INC., conducted a joint demonstration experiment (hereinafter, "the demonstration") to stabilize communications and ensure continuous video transmission for the remote operation and remote monitoring of robotic agricultural machinery in mountainous areas. In the demonstration, optimal control was applied to video transmission required for robotic agricultural machinery operation by combining mobile and satellite communications, together with video control technology. As a result, visibility of transmitted video was maintained even under fluctuating communication conditions, demonstrating the effectiveness of the technology as a communications infrastructure supporting remote op...