CHO
Conditional Handover
MobilityIntroduced Rel-16
Definition
A handover in which the UE holds stored candidate configurations and applies one when its execution condition is fulfilled. Conditions include measurement events (condEventA3, A4, A5) and NTN distance and time events (condEventD1, D2, T1).
Evolution Across Releases
- condRRCReconfig-r16 in TS 38.331; condEventA4, D1 and T1 are -r17; condEventD2 is -r18.
Related Specifications
TS 38.300
NR; NR and NG-RAN Overall description; Stage-2
Architecture
Rel-19TS5G-AdvancedUpdated 2026-10-16
TS 38.331
NR; Radio Resource Control (RRC); Protocol specification
Protocol
Rel-19TSMobilityUpdated 2026-10-16
TS 38.423
NG-RAN; Xn Application Protocol (XnAP)
Protocol
Rel-19TSMobilityUpdated 2026-10-16