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5G NR UE Identities and Network Identities

prodevelopertutorial September 10, 2022

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.

Network Identities

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.

RNTI

TS 38.300

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