TY  - JOUR
T1  - An Overview of Mobility Enhancement Technologies for 5G-Advanced Non-Terrestrial Networks (NTN)
AU  - Park, Soyeon 
AU  - Kim, Jaewoo 
AU  - Lee, Jongman 
AU  - Park, Hyun 
AU  - Chang, Jinyeong 
AU  - Choi, Suhan 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2025
DA  - 2025/1/1
DO  - 10.7840/kics.2025.50.12.1846
KW  - NTN(Non-Terrestrial Networks)
KW  - Mobility
KW  - 5G
KW  - 5G-Advanced
KW  - 3GPP Release 18
AB  - This paper analyzes and describes the mobility enhancement technologies standardized in 3GPP Release 18, corresponding to the 5G-Advanced specifications, for Non-Terrestrial Networks (NTNs). In particular, it provides a detailed discussion of key technologies such as NTN-TN mobility, RACH-less handover in NTN environments, satellite switch with re-synchronization, cell measurement methods and triggering events in moving-cell scenarios, and conditional handover enhancements. Furthermore, the paper examines the improvements introduced compared to previous Releases, and explains the concepts, protocol procedures, and future development directions of each technology.