Working Timeline of 5G in Japan akihabaranews.com

2015March: NTT DoCoMo announces that it will conduct a three-way 5G technical collaboration with China Mobile Communications Corporation and KT Corporation.
Huawei and Mitsubishi Electric are added to the list of NTT DoCoMo 5G vendors.
NTT DoCoMo also achieves the world’s first 5G mobile communications between base stations and a high-speed bullet train in collaboration with Central Japan Railway Company.
2020January: NTT DoCoMo announces it will launch a video-streaming service based on 5G high-speed wireless technology beginning in March.
February: Ministry of Internal Affairs and Communications issues to Fujitsu the country’s first preliminary license to build a local 5G communications network.