Credit: Electronics and Telecommunications Research Institute(ETRI) Researchers in Korea have developed a important network technology that allows users to enjoy 5G services seamlessly in indoor environment. It is expected to be of great help in expanding the 5G coverage area and further improving the domestic telecommunications infrastructure. Electronics and Telecommunications Research Institute (ETRI) announced that it has successfully developed the world's first 5G indoor DAS 1) that can receive millimeter wave (28GHz) - based broadband 5G signals from base stations and transmit them into buildings. About 80% of mobile data used in daily life is consumed indoors. This new technology allows accessing 5G technology at its peak speed of 20Gbps in indoor environments such as airports, stations, and large shopping malls. In particular, this new technology significantly improves transmission capacity, equipment size, deployment cost, etc. compared to the conventional one, so it is expected to have a diverse range of applications.