5.47 Support for Network Controlled Repeater (NCR)

A Network-Controlled Repeater node, referred to as NCR-node, is an RF repeater that enables wireless amplifying-and-forwarding functionality in NG-RAN as defined in TS 38.300 [27].

In NCR operation, the NCR-MT as defined in TS 38.300 [27] interacts with the 5GC using procedures defined for UE. The following aspects are enhanced to support the NCR operation:

• The UE Subscription data as defined in clause 5.2.3 of TS 23.502 [3] is enhanced to include the authorization information for the NCR operation;
• During the UE Registration procedure, the AMF is enhanced to perform authorization of the NCR based on subscription information from UDM. The AMF uses Initial UE Context Setup procedure to provide NCR authorization status information to NG-RAN.
• If the authorization status of NCR-MT changes after initial registration, the AMF uses the UE Context Modification procedure to NG-RAN to update the NG-RAN with the new authorization status.