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Content for  TS 38.413  Word version:  16.3.0

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8.10  NRPPa Transport ProceduresWord‑p. 91

8.10.1  General

The purpose of the NRPPa Transport procedure is to carry NRPPa signalling (defined in TS 38.455) between the NG-RAN node and the LMF over the NG interface as defined in TS 38.455. The procedure may use UE-associated signalling or non-UE associated signalling. The UE-associated signalling is used to support E-CID Location Information Transfer and Positioning Information Transfer. The non-UE associated signalling is used to support OTDOA Information Transfer, Assistance Information Transfer, TRP Information Transfer, and Measurement Information Transfer.
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8.10.2  Successful Operations

8.10.2.1  DOWNLINK UE ASSOCIATED NRPPA TRANSPORT

Reproduction of 3GPP TS 38.413, Figure 8.10.2.1-1: Downlink UE-associated NRPPa transport
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The AMF initiates the procedure by sending the DOWNLINK UE ASSOCIATED NRPPA TRANSPORT message to the NG-RAN node.

8.10.2.2  UPLINK UE ASSOCIATED NRPPA TRANSPORT

Reproduction of 3GPP TS 38.413, Figure 8.10.2.2-1: Uplink UE-associated NRPPa transport
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The NG-RAN node initiates the procedure by sending the UPLINK UE ASSOCIATED NRPPA TRANSPORT message to the AMF.

8.10.2.3  DOWNLINK NON UE ASSOCIATED NRPPA TRANSPORTWord‑p. 92
Reproduction of 3GPP TS 38.413, Figure 8.10.2.3-1: Downlink non UE-associated NRPPa transport
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The AMF initiates the procedure by sending the DOWNLINK NON UE ASSOCIATED NRPPA TRANSPORT message to the NG-RAN node.

8.10.2.4  UPLINK NON UE ASSOCIATED NRPPA TRANSPORT

Reproduction of 3GPP TS 38.413, Figure 8.10.2.4-1: Uplink non UE-associated NRPPa transport
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The NG-RAN node initiates the procedure by sending the UPLINK NON UE ASSOCIATED NRPPA TRANSPORT message to the AMF.

8.10.3  Unsuccessful Operations

Not applicable.

8.10.4  Abnormal Conditions

If an AMF receives an UPLINK UE ASSOCIATED NRPPA TRANSPORT message with an unknown Routing ID for the UE, the AMF shall ignore the message.
If an AMF receives an UPLINK NON UE ASSOCIATED NRPPA TRANSPORT message indicating an unknown or unreachable Routing ID, the AMF shall ignore the message.

8.11  Trace Procedures

8.11.1  Trace Start

8.11.1.1  General

The purpose of the Trace Start procedure is to allow the AMF to request the NG-RAN node to initiate a trace session for a UE. The procedure uses UE-associated signalling. If no UE-associated logical NG-connection exists, the UE-associated logical NG-connection shall be established as part of the procedure.

8.11.1.2  Successful OperationWord‑p. 93
Reproduction of 3GPP TS 38.413, Figure 8.11.1.2-1: Trace start
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The AMF initiates the procedure by sending a TRACE START message. Upon reception of the TRACE START message, the NG-RAN node shall initiate the requested trace session as described in TS 32.422.
If the Trace Activation IE is included in the TRACE START message which includes the MDT Activation IE set to "Immediate MDT and Trace", the NG-RAN node shall, if supported, initiate the requested trace session and MDT session as described in TS 32.422.
If the Trace Activation IE is included in the TRACE START message which includes the MDT Activation IE set to "Immediate MDT Only", "Logged MDT only", the NG-RAN node shall, if supported, initiate the requested MDT session as described in TS 32.422 and the NG-RAN node shall ignore the Interfaces To Trace IE and the Trace Depth IE.
If the Trace Activation IE includes the MDT Location Information IE within the MDT Configuration IE, the NG-RAN node shall, if supported, store this information and take it into account in the requested MDT session.
If the Trace Activation IE is included in the TRACE START message which includes the MDT Activation IE set to "Immediate MDT Only", "Logged MDT only" and if the Signalling Based MDT PLMN List IE is included in the MDT Configuration IE, the NG-RAN node may use it to propagate the MDT Configuration as described in TS 37.320.
If the Trace Activation IE includes the Bluetooth Measurement Configuration IE within the MDT Configuration IE, the NG-RAN node shall, if supported, take it into account for MDT Configuration as described in TS 37.320.
If the Trace Activation IE includes the WLAN Measurement Configuration IE within the MDT Configuration IE, the NG-RAN node shall, if supported, take it into account for MDT Configuration as described in TS 37.320.
If the Trace Activation IE includes the Sensor Measurement Configuration IE within the MDT Configuration IE, the NG-RAN node shall, if supported, take it into account for MDT Configuration as described in TS 37.320.
If the Trace Activation IE includes the MDT Configuration IE and if the NG-RAN node is a gNB at least the MDT Configuration-NR IE shall be present, while if the NG-RAN node is an ng-eNB at least the MDT Configuration-EUTRA IE shall be present.
Interactions with other procedures:
If the NG-RAN node is not able to initiate the trace session due to ongoing handover of the UE to another NG-RAN node, the NG-RAN node shall initiate a Trace Failure Indication procedure with the appropriate cause value.
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8.11.1.3  Abnormal Conditions

Void.

8.11.2  Trace Failure IndicationWord‑p. 94

8.11.2.1  General

The purpose of the Trace Failure Indication procedure is to allow the NG-RAN node to inform the AMF that a Trace Start procedure or a Deactivate Trace procedure has failed due to an interaction with a handover procedure. The procedure uses UE-associated signalling.

8.11.2.2  Successful Operation

Reproduction of 3GPP TS 38.413, Figure 8.11.2.2-1: Trace failure indication
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The NG-RAN node initiates the procedure by sending a TRACE FAILURE INDICATION message. Upon reception of the TRACE FAILURE INDICATION message, the AMF shall take appropriate actions based on the failure reason indicated by the Cause IE.

8.11.2.3  Abnormal Conditions

Void.

8.11.3  Deactivate Trace

8.11.3.1  General

The purpose of the Deactivate Trace procedure is to allow the AMF to request the NG-RAN node to stop the trace session for the indicated trace reference. The procedure uses UE-associated signalling.

8.11.3.2  Successful Operation

Reproduction of 3GPP TS 38.413, Figure 8.11.3.2-1: Deactivate trace
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The AMF initiates the procedure by sending a DEACTIVATE TRACE message to the NG-RAN node as described in TS 32.422. Upon reception of the DEACTIVATE TRACE message, the NG-RAN node shall stop the trace session for the indicated trace reference in the NG-RAN Trace ID IE.
Interactions with other procedures:
If the NG-RAN node is not able to stop the trace session due to ongoing handover of the UE to another NG-RAN node, the NG-RAN node shall initiate a Trace Failure Indication procedure with the appropriate cause value.
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8.11.3.3  Abnormal ConditionsWord‑p. 95
Void.

8.11.4  Cell Traffic Trace

8.11.4.1  General

The purpose of the Cell Traffic Trace procedure is to send the allocated Trace Recording Session Reference and the Trace Reference to the AMF. The procedure uses UE-associated signalling.

8.11.4.2  Successful Operation

Reproduction of 3GPP TS 38.413, Figure 8.11.4.2-1: Cell traffic trace
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The NG-RAN node initiates the procedure by sending a CELL TRAFFIC TRACE message.
If the Privacy Indicator IE is included in the message, the AMF shall take the information into account for anonymization of MDT data as described in TS 32.422.

8.11.4.3  Abnormal Conditions

Void.

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