협대역 사물인터넷(NB-IoT) 적용 등을 위해 비용을 절감해야 하고, 기본 설계를 잘해서 특별한 문제가 없다는 판단에 따랐다.
It was necessary to reduce the cost for the application of NB-IoT, etc., and it was decided that there was no special problem as the basic design was good.