In recent years, due to the development of innovative satellite launch vehicle technologies, the cost of launching and producing satellites has rapidly decreased. Consequently, a large number of operators have emerged to provide global communication services through low-orbit satellite clusters such as OneWeb, SpaceX, Project Kuiper, and Telesat. Also, the global market of unmanned aerial vehicles such as smart airlines, flying taxis (air taxis), and drones is expected to increase rapidly. The area of communication that provides Gbps grade internet service will be expanded to non-terrestrial networks (NTN) to support not only service enhancement and coverage extension on the ground, but also in a three-dimensional (3D) space and at sea. Therefore, terminals will be able to receive Gbps grade internet service anytime, anywhere. In order to provide such a service, B5G/6G NTN technologies for providing communication coverage in the 3D space are required beyond the limit of a ground-oriented mobile communication service. It is expected that it will be possible to provide reliable internet services to various moving vehicles in the air and on the ground through integrated satellite and terrestrial network technologies. The integrated satellite-terrestrial networks leverage on various technologies to make the architecture of heterogeneous networks operationally effective as seamless service coverage, robust service supporting ability, and high-efficiency performance. New handover schemes to tackle frequent handover due to satellite movement will be developed. The improvement of beam management will be required for mobility of satellites and aerial vehicles, long round-trip time (RTT), wide beam coverage, and various beam types. Antenna technologies for LEO satellite payload will be crucial. Also, the support of mobile edge cloud and edge intelligence through NTN connectivity will be important. 3GPP NTN Standardisation Roadmap Networks Detached from Ground – the Rise of NTN in 5G Advanced and 6G Taming Aerial Communications with 6G Smart Surfaces What about Satellite Communication in 6G? TIP's Open RAN Approach for Non-Terrestrial Connectivity Solutions