3GPP 38.300 v19.3.0 — the document's own text
8.1 UE Identities
Taught in 6. The three states a device sits in (TSG RAN — the group that specifies the radio, in depth), 8. Where the radio network meets the core (TSG RAN — the group that specifies the radio, in depth), 5. The layers a packet falls through, and the three states a device sits in (TSG RAN — the group that specifies the radio, overview).
In this clause, the identities used by NR connected to 5GC are listed. For scheduling at cell level, the following identities are used:
- C-RNTI: unique UE identification used as an identifier of the RRC Connection and for scheduling;
- CG-SDT-CS-RNTI: unique UE identification used for Configured Grant-based SDT in the uplink;
- CI-RNTI: identification of cancellation in the uplink;
- CS-RNTI: unique UE identification used for Semi-Persistent Scheduling in the downlink or configured grant in the uplink;
- INT-RNTI: identification of pre-emption in the downlink;
- MCS-C-RNTI: unique UE identification used for indicating an alternative MCS table for PDSCH and PUSCH;
- P-RNTI: identification of Paging and System Information change notification in the downlink;
- SI-RNTI: identification of Broadcast and System Information in the downlink;
- SP-CSI-RNTI: unique UE identification used for semi-persistent CSI reporting on PUSCH.
For power and slot format control, the following identities are used:
- SFI-RNTI: identification of slot format;
- TPC-PUCCH-RNTI: unique UE identification to control the power of PUCCH;
- TPC-PUSCH-RNTI: unique UE identification to control the power of PUSCH;
- TPC-SRS-RNTI: unique UE identification to control the power of SRS.
During the random access procedure, the following identities are also used:
- RA-RNTI: identification of the Random Access Response in the downlink;
- MSGB-RNTI: identification of the Random Access Response for 2-step RA type in the downlink;
- Temporary C-RNTI: UE identification temporarily used for scheduling during the random access procedure;
- Random value for contention resolution: UE identification temporarily used for contention resolution purposes during the random access procedure.
For NR connected to 5GC, the following UE identity is used at NG-RAN level:
- I-RNTI: used to identify the UE context in RRC_INACTIVE.
For UE power saving purpose, the following identities are used:
- PS-RNTI: used to determine if the UE needs to monitor PDCCH on the next occurrence of the connected mode DRX on-duration;
- PEI-RNTI: used to determine if the UE needs to monitor the associated PO.
For IAB the following identity is used:
- AI-RNTI: identification of the DCI carrying availability indication for soft symbols of an IAB-DU.
For Network-Controlled Repeater the following identity is used:
- NCR-RNTI: identification of the DCI carrying side control information.
For MBS, the following identities are used:
- G-RNTI: Identifies dynamically scheduled PTM transmissions of MTCH(s);
- G-CS-RNTI: Identifies configured scheduled PTM transmissions of MTCH(s) scheduled with configured grant;
- MCCH-RNTI: Identifies transmissions of MCCH and MCCH change notification for broadcast reception.
- Multicast MCCH-RNTI: Identifies transmissions of MCCH and MCCH change notification for multicast reception in RRC_INACTIVE state.
For sidelink, the following identities are used:
- SL-RNTI: unique UE identification used for NR sidelink communication scheduling;
- SL-CS-RNTI: unique UE identification used for configured sidelink grant for NR sidelink communication;
- SL Semi-Persistent Scheduling V-RNTI: unique UE identification used for semi-persistent scheduling for V2X sidelink communication;
- SL-PRS-RNTI: unique UE identification used for SL-PRS transmission scheduling on dedicated SL-PRS resource pool;
- SL-PRS-CS-RNTI: unique UE identification used for configured sidelink grant for SL-PRS transmission on dedicated SL-PRS resource pool.
For network energy saving purpose, the following identity is used:
- cellDTRX-RNTI: identification used for network energy saving indication.