South Korean operator SK Telecom, in partnership with Samsung Electronics and Nokia, has demonstrated 5G communications using the 3.5GHz band. SK Telecom partnered with Samsung Electronics to develop a 3.5GHz 5G network, comprised of 5G virtualized core, virtualized RAN, Distributed Unit (baseband unit and radio unit) and test device, based on the 3GPP 5G New Radio (5G NR) standards elements established to date.
The two companies’ 5G NR system is built with a subcarrier spacing of 60 kHz, Transmit Time Interval (TTI) length of 0.25ms, and Low-Density Parity-Check (LDPC) channel coding for data communications. The two companies completed the 5G network trial using the 3.5GHz spectrum at Samsung Electronics’ R&D Center located in Suwon, Korea.
SK Telecom and Nokia co-developed 5G base station equipment and test device for the 3.5GHz spectrum and realized Gbps-level throughput during a field trial held near its Bundang Office Building through the application of carrier aggregation techniques to expand bandwidth. The two companies also measured link quality (BLER) depending on the distance between a moving vehicle and base station, collecting data for designing optimal 5G commercial networks in the 3.5GHz band.
SK Telecom plans to continue to work with Samsung Electronics and Nokia to further enhance transmission speeds, expand coverage and improve communication stability while on the move.
Through trials of 3.5GHz 5G networks, SK Telecom says it has secured all essential technologies to deploy 5G networks using above-6GHz and below-6GHz frequencies. SK Telecom plans to deploy commercial 5G networks using 28GHz in downtown areas where data traffic is most concentrated, while covering wide areas with 3.5GHz 5G networks or a combination of 3.5GHz and 28GHz 5G networks.
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