5G NR UE Identities:
1. C-RNTI: Unique UE identity used to identify UE for RRC Connection and for scheduling.
2. CI-RNTI: It is used of cancellation in the uplink.
3. CS-RNTI: Unique UE identification used for Semi-Persistent Scheduling in the downlink or configured grant in the uplink;
4. INT-RNTI: Identification of pre-emption in the downlink;
5. MCS-C-RNTI: Unique UE identification used for indicating an alternative MCS table for PDSCH and PUSCH;
6. P-RNTI: Identification of Paging and System Information change notification in the downlink;
7. SI-RNTI: Identification of Broadcast and System Information in the downlink;
8. 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:
1. SFI-RNTI: Identification of slot format;
2. TPC-PUCCH-RNTI: Unique UE identification to control the power of PUCCH;
3. TPC-PUSCH-RNTI: Unique UE identification to control the power of PUSCH;
4. TPC-SRS-RNTI: Unique UE identification to control the power of SRS.
During the random access procedure, the following identities are also used:
1. RA-RNTI: Identification of the Random Access Response in the downlink;
2. Temporary C-RNTI: UE identification temporarily used for scheduling during the random access procedure;
3. 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.
1. AMF Name: Used to identify an AMF.
2. NR Cell Global Identifier (NCGI): Used to identify NR cells globally.
3. gNB Identifier (gNB ID): Used to identify gNBs within a PLMN.
4. Global gNB ID: Used to identify gNBs globally.