The purpose of the UE Radio Capability Check procedure is for the AMF to request the NG-RAN node to derive and provide an indication to the AMF on whether the UE radio capabilities are compatible with the network configuration for IMS voice. The procedure uses UE-associated signalling.
The AMF initiates the procedure by sending a UE RADIO CAPABILITY CHECK REQUEST message. If the UE-associated logical NG-connection is not established, the AMF shall allocate a unique AMF UE NGAP ID to be used for the UE and include the
AMF UE NGAP ID IE in the UE RADIO CAPABILITY CHECK REQUEST message; by receiving the
AMF UE NGAP ID IE in the UE RADIO CAPABILITY CHECK REQUEST message, the NG-RAN node establishes the UE-associated logical NG-connection.
Upon receipt of the UE RADIO CAPABILITY CHECK REQUEST message, the NG-RAN node checks whether the UE radio capabilities are compatible with the network configuration for IMS voice, and responds with a UE RADIO CAPABILITY CHECK RESPONSE message, as defined in
TS 23.502.
If the
UE Radio Capability IE is contained in the UE RADIO CAPABILITY CHECK REQUEST message, the NG-RAN node shall use it to determine the value of the
IMS Voice Support Indicator IE to be included in the UE RADIO CAPABILITY CHECK RESPONSE message.
If the UE RADIO CAPABILITY CHECK REQUEST message contains the
UE Radio Capability ID IE, the NG-RAN node shall, if supported, use it as specified in
TS 23.501 and
TS 23.502.
Not applicable.
Void.