3 March 2025 – KT has collaborated with Rohde & Schwarz and VIAVI Solutions to develop non-terrestrial network (NTN) technology that overcomes the disadvantages of long propagation delays in satellite communication environments. With this technology, a bandwidth of more than 10 Mbps is possible even between a geostationary (GEO) satellite and user device. This increased transmission efficiency was leveraged to successfully transmit full HD video. KT successfully demonstrated 5G non-terrestrial network (NTN) technology in a satellite communication environment with long propagation delays. It used a method that accurately calculates path loss between the satellite and device based on their varying distance over time, without using retransmission techniques (HARQ-less). As a result, a bandwidth of more than 10 Mbps was achieved at approximately 35,000 km between the satellite and user device, enabling full HD video transmission. Read more