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NGAP initiating message used by the NG-RAN to transfer the UE's first uplink NAS message to the AMF.

Starts a 5G registration or mobility update by sending UE identity and registration intent to the core.

Reconfigures the UE radio connection after setup, including bearers, measurements, and mobility.

Uplink NR RRC message sent by the UE on SRB0 and CCCH to request re-establishment of an existing RRC connection after radio link failure, handover failure, or reconfiguration failure.

Downlink NR RRC message sent by the gNB to establish SRB1 and move the UE into the connected RRC procedure.

Downlink NR RRC message used by the network to reject an RRC connection establishment attempt or an RRC connection resumption attempt.

Uplink NR RRC message sent by the UE on SRB1 and DCCH to confirm successful RRC connection establishment and transfer the initial NAS message.

Uplink NR RRC message sent by the UE on SRB0 and CCCH to request establishment of an RRC connection.

Downlink NR RRC message used by the gNB to activate AS security for the UE in RRC_CONNECTED.

Uplink NR RRC message used by the UE to confirm successful activation of the selected AS security configuration.

Uplink NR RRC message used by the UE to indicate that the commanded AS security activation could not be completed successfully.

Downlink NR RRC message used by the gNB to request UE capability information needed for feature, bearer, mobility, and radio configuration decisions.

Uplink NR RRC message used by the UE to report its supported radio capability containers to the gNB.