Feature Description
The Radio Resource Control (RRC) is a layer within the 5G NR protocol stack. It exists only in the control plane, in the UE, and in the gNB. The existing state of PDU sessions controls the behaviour and functions of the RRC.
During the PCF-initiated modification, the AMF sends those received unsuccessful transfer radio networks cause codes in the N2 content of the SmContextUpdate message to the SMF under the following conditions:
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When the Xn-handover is in progress.
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When the AN is released.
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When the UE is in the RRC inactive state.
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When the UE isn’t reachable.
The SmContextUpdate message with the N2 cause codes acts as a bridge and converter from AMF to SMF or from SMF to AMF.