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5G NR Identifiers, 5G UE Identifiers, 5G Network Identifiers

This page on 5G NR Identifiers covers 5G Identifiers for UE and Network. The 5G UE identifiers include C-RNTI, temporary C-RNTI etc. The 5G network identifiers include AMF, NCGI, gNB ID, global gNB ID, TAI etc. Refer what is 5G NR? and its features.

5G UE Identifiers | C-RNTI, temporary C-RNTI

Following table-1 describes 5G UE Identifiers.

5G UE Identifiers Description
C-RNTI It is used for RRC connection and scheduling. In dual connection case, two C-RNTIs are allocated to UE for MCG and SCG functionalities independently. Here MCG and SCG stands for Master Cell Group and Slave Cell Group respectively.
temporary C-RNTI • It is used for random access procedure.
• It is used as random value for contention resolution purpose by UE in certain transient states.
I-RNTI It is used in order to identify UE Context for RRC_INACTIVE state. It is used at NG-RAN level for NR connected to 5GC.

5G Network Identifiers | AMF, NCGI, gNB ID, global gNB ID, TAI

Following table-2 describes 5G network Identifiers.

5G Network Identifiers Description
AMF It is used to identify Access and Mobility Management Function (AMF).
NCGI • It is used to identify NR cells at global scale.
• It is constructed from two values i.e. PLMN and NCI (NR Cell identity).
gNB ID • It identifies gNBs within PLMN.
• NCI of cells contain gNB ID field.
global gNB ID • It identifies gNBs at global scale. It is constructed from PLMN and gNB ID.
• It uses same MCC and MNC as used in NCGI.
TAI • It is the short form of Tracking Area Identity.
• It is used to identify tracking areas.
• It is constructed from PLMN of tracking area and TAC (Tracking Area Code).

References: ( 1.) 3GPP TS 38.300 ( 2.) TS V5G.300


This 5G tutorial also covers following sub topics on the 5G technology:
5G basic tutorial
5G Frequency Bands
5G millimeter wave tutorial
5G mm wave frame
5G millimeter wave channel sounding
Difference between 4G and 5G
5G testing and test equipments
5G network architecture

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