TY  - JOUR
T1  - An Overview of Mobility Enhancement Technologies for Non-Terrestrial Networks in 3GPP 5G Standards
AU  - Park, Soyeon 
AU  - Jang, Junmo 
AU  - Choi, Suhan 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2025
DA  - 2025/1/1
DO  - 10.7840/kics.2025.50.2.280
KW  - 5G
KW  - NR
KW  - Non-Terrestrial Network
KW  - NTN
KW  - 3GPP
KW  - LEO
KW  - Handover
KW  - Tracking area
KW  - Switchover
AB  - This paper describes mobility enhancement technologies for Non-Terrestrial Networks (NTNs) based on the 3GPP 5G standards, focusing on differences from existing Terrestrial Networks (TN). It introduces difficult problems to support mobility according to the structural characteristics of non-terrestrial networks and deals in detail with tracking area, conditional handover, and feeder link switchover to overcome them. By introducing issues related to mobility in non-terrestrial networks discussed in 3GPP Release 18, which was standardized at the end of 2023, the future development potential and trends of mobility technologies for non-terrestrial networks are also described.