Editing My 3GPP 38.300 Notes (section)

=== 8.1 UE Identities ===

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;
* 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;
* 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 identities are used at NG-RAN level:
* I-RNTI: used to identify the UE context in RRC_INACTIVE.

For UE power saving purpose during DRX, the following identity is used:
* PS-RNTI: used to determine if the UE needs to monitor PDCCH on the next occurrence of the connected mode DRX on-duration.

For IAB the following identity is used:
* AI-RNTI: identification of the DCI carrying availability indication for soft symbols of an IAB-DU.

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);
* MCCH-RNTI: Identifies transmissions of MCCH and MCCH change notification.