A technology enables satellite communication with over 10 Mbps bandwidth without retransmission, allowing data transfer, including HD video, over long distances.
KT, in collaboration with Rohde & Schwarz and VIAVI Solutions, has developed non-terrestrial network (NTN) technology to address long propagation delays in satellite communication. This technology enables bandwidth exceeding 10 Mbps between a geostationary (GEO) satellite and a user device, allowing efficient data transmission, including full HD video.
KT have demonstrated 5G non-terrestrial network (NTN) technology in a satellite communication environment with long propagation delays. The method calculates path loss between the satellite and device based on their changing distance over time without using retransmission techniques (HARQ-less). This enabled a bandwidth of over 10 Mbps at approximately 35,000 km, supporting full HD video transmission. The technology was developed using the NTN digital twin testbed from Rohde & Schwarz and VIAVI Solutions, based on the CMX500 one-box signaling tester and the VIAVI TM500-AS2 Network Tester.
The CMX500 provides 5G NR testing with channel emulation and fading, supporting all 3GPP fading profiles and configurable RF units for various band combinations. The VIAVI TM500 Network Tester simulates thousands of mobile devices for functional, system integration, and performance testing of 5G base stations, working with the VIAVI TeraVM for application and security testing across wired and wireless networks.
Tae-hoon Kim, Managing Director of Rohde & Schwarz Korea, says: “Rohde & Schwarz has continuously worked to overcome technical challenges in satellite communication environments. This collaborative research with KT was conducted using the CMX500 platform, which meets the requirements of mobile communication technologies such as 5G and NTN, allowing us to secure the latest technology and validate advanced implementations.”
Beom-seok Seo, Country Director of VIAVI Solutions Korea, says: “We have achieved over 10 Mbps in long-distance satellite communication using HARQ-less technology. This technology has the potential in public safety operations and other similar applications.”
Jong-sik Lee, Executive Vice President of Future Network Laboratory, KT, says: “NTN is an essential technology for ubiquitous connectivity in the 6G era. In the future, KT will continue to expand communication coverage beyond terrestrial limits and into three-dimensional aerial spaces, leading the way into the 6G era.”
