I asked the person in charge of DOCOMO's "Instant Heart 5g" that could expand the large area this summer

　NTT DOCOMO aims to expand the area using a new frequency band assigned only for 5G.

　Aiming at the end of March 2022, about 55 %, about 70 % at the end of March of 2013, and about 80 % at the end of March 2014, the area expanded.

　The big difference is that among the three major companies, the coverage is expanded in a new frequency band for 5G without relying on frequency diversion from 4G.The new frequency band has a high frequency and a wide bandwidth, so it is easy to speed up.In DoCoMo, this is called "instantaneous 5G" and appeals.

　The new frequency band for 5G is 3.7GHz and 4.In the 5GHz band, the radio waves are highly advanced, and it is difficult to turn around into buildings.Therefore, the area was not enough at first, and the place where 5G could be used was limited.

　However, if you look at the area map released by DOCOMO, you can see that the area is rapidly expanding at the end of August, as of June 6 (at the time of this article) and two months later.It can be said that the spot -like area has been covered.

　On the other hand, while the area was rapidly expanding, a problem unique to 5G occurred.That is the fact that the communication quality is extremely reduced in the "end" of an area where the 5G radio waves are weak.Combined with 5G users at a stretch at the start of AHAMO, there are frequent voices on SNS that they cannot communicate even though they are 5G.In this magazine, I reported the trouble with "Everyone's Mobile Phone".

I can't communicate even though the antenna is the largest!?

　So why can DOCOMO expand the area in summer?Also, what kind of work will be taken to solve the current problems?

　Mr. Yoshiaki Hiramoto, the director of the Network Headquarters Radio Access Network, who is in charge of planning, design and operation of Network in DOCOMO, Takahiro Makiyama, the director of the area quality department, and Akito Mito, the section manager in charge of quality planning.We talked to three people.