When building mobile phone base stations, Japanese telecommunications companies are focusing on introducing a method called "Open RAN" The method reduces costs by not integrating various devices into one manufacturer. NTT Docomo announced last month that it would establish a new company jointly with NEC in order to expand its introduction to overseas mobile phone companies.
American telecommunications giant AT&T moving forward with a joint implementation plan with telecommunications giant Ericsson. The problem is that there is less freedom for improvement and it is difficult to reduce costs.