5G meets satellite: Non‐terrestrial network architecture and 3GPP

Abstract

SummaryWith 3GPP Release‐17, global 5G standards now support non‐terrestrial mobile networks comprising radio access network, terminals, and core network. This enables multi‐vendor interoperability as well as interoperability with 3GPP‐compliant 5G systems. This paper describes the key features enabling the NG‐RAN architecture defined for 5G to support non‐terrestrial networks. Starting from a general overview of NG‐RAN and of the new paradigms of NTN, we introduce the NTN functionality in NG‐RAN specifications with respect to feeder link switchover, cell handling, terminal registration, and OAM aspects. We also discuss different scenarios combining satellite access with 3GPP‐defined core networks. We also describe some further enhancements expected to be seen in the next 3GPP release (Rel‐18). We believe current and upcoming 3GPP work for NTN represents a solid basis on which 5G satellite networks can be built in the upcoming future.