Most people who use smartphones use Wi-Fi at home and 4G / 5G outside.It's convenient, but I think there are many negative reasons such as "I want to save giga" and "Videos are jerky with 4G".In addition, since FTTH and CATV services, which are the foundations of Wi-Fi, and 4G / 5G services are provided by different communication infrastructures, authentication methods, communication quality, contracts, and fee formats are also different.This "natural" has finally come to an end.This is because the standardization body is developing the "5G WWC (Wireline-Wireless Convergence)" specification that integrates the two networks.As shown on the right side of Chart 1, we aim to integrate fixed access networks such as FTTH in a 5G core (5GC)."FMC (Fixed Mobile Convergence)" once attracted attention even in the 3G era.In Japan as well, a fixed-line and mobile phone cooperation service has been realized, but it is only an application-level story, and it is just a bundle of two types of telephone charges.