3GPP 23.501 v20.2.0 — the document's own text
5.31.7.1 General
Taught in 25. Small devices, small messages (The 5G system architecture, in depth).
To enable UE power saving and to enhance MT reachability while using MICO mode, e.g. for CIoT, the following features are specified in the following clauses:
- Extended Discontinuous Reception (DRX) for CM-IDLE and CM-CONNECTED with RRC_INACTIVE;
- MICO mode with Extended Connected Time;
- MICO mode with Active Time;
- MICO mode and Periodic Registration Timer Control.
If a UE requests via NAS to enable both MICO mode with Active Time and extended idle mode DRX, e.g. based on local configuration, Expected UE Behaviour, if available, UE requested Active Time value, UE subscription information and network policies etc, the AMF may decide to enable MICO mode with or without Active Time, extended idle mode DRX or both.
The functions and procedures to enable a UE using power saving functions to receive MBS service are defined in TS 23.247 [129].