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National Science and Technology Research Council
South Korean researchers have developed an important network technology that allows users to seamlessly enjoy 5G services in indoor environments. It is expected to be of great help to expand the coverage of 5G and further improve the construction of domestic telecommunications infrastructure.
The Electronics and Telecommunications Research Institute (ETRI) announced that it has successfully developed the world's first 5G indoor distributed antenna system that can receive millimeter wave (28GHz)-based broadband 5G signals from base stations and transmit them to buildings.
About 80% of mobile data in daily life is consumed indoors. This new technology allows access to 5G technology at peak speeds of 20Gbps in indoor environments such as airports, stations, and shopping malls. In particular, compared with the traditional technology, this new technology significantly improves the transmission capacity, equipment size and deployment cost, and is expected to be widely used.
The core technology developed by the researchers includes RoF technology and 5G base station interface technology. RoF technology converts 5G wireless signals into optical signals and transmits them without distortion within a distance of up to 5km. On the other hand, 5G base station interface technology connects outdoor 5G base stations and indoor distributed antenna systems through OTA technology.
The 5G base station interface installed on the roof of the apartment receives 5G signals from nearby base stations, uses RoF technology in the basement of the apartment to convert the 5G signals into optical signals, and then transmits them to buildings with multiple antennas distributed in each area on each floor.
Because this technology can multiplex 5G signals into 32 frequency bands for transmission, its transmission capacity is very high. Compared with the previous system, the construction cost can be reduced by 5 times, because only relatively simple functions are required.
The researchers revealed that they developed a notebook-sized RoF optical transceiver and installed it in the host unit and antenna unit that constitute the indoor distributed antenna system. The 5G base station interface technology is also developed in the form of an independent module the size of a laptop, which is convenient for linkage with the host unit.
According to the research team, the recent rapid increase in the use of high frequency bands and large-capacity data has led to the use of RoF technology that has been studied since the 1990s. They were able to achieve this feat based on the accumulation of original technology and know-how.
ETRI demonstrated the world’s first millimeter wave-based 5G pilot service based on 5G indoor distributed antenna system technology at the Pyeongchang Winter Olympics in February 2018. Upgrade to the current level.
"We hope that this technology will help create new converged industrial ecosystems such as interactive entertainment and smart factories, as well as revitalize the domestic stagnant industrial ecosystem related to mobile communication repeaters, while ensuring service quality and eliminating radio-eaves that shelter indoors. Area," said Sunmi Kim, head of ETRI's network research department.
The research team is also studying next-generation communication infrastructure construction technology to provide 6G mobile networks beyond 5G in the future indoor environment. It plans to develop next-generation 6G communication network technology based on ultra-wide frequency bands while ensuring future intellectual property rights and leading the development of domestic related industries.
Companies that have acquired technology from ETRI are now exporting related products to Japan and the United States through active commercialization. Therefore, ETRI's technology is contributing to the construction of global 5G infrastructure. Exploring to further improve the performance of future 5G cellular networks Provided by the National Science and Technology Research Committee: The team developed the world's first 5G indoor distributed antenna system (January 26, 2021) Retrieved on November 25, 2021 from https://techxplore.com/ news/2021-01-team-world-5g-indoor-antenna.html This document is protected by copyright. Except for any fair transaction for private learning or research purposes, no part may be copied without written permission. The content is for reference only.
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