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Content for  TS 38.473  Word version:  16.3.1

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8.6  System Information Procedures

8.6.1  System Information Delivery

8.6.1.1  General

The purpose of the System Information Delivery procedure is to command the gNB-DU to broadcast the requested Other SI. The procedure uses non-UE associated signalling.

8.6.1.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.6.1.2-1: System Information Delivery procedure. Successful operation.
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The gNB-CU initiates the procedure by sending a SYSTEM INFORMATION DELIVERY COMMAND message to the gNB-DU.
Upon reception of the SYSTEM INFORMATION DELIVERY COMMAND message, the gNB-DU shall broadcast the requested Other SI, and delete the UE context corresponding to the Confirmed UE ID IE, if any.
Interactions with gNB-DU Configuration Update procedure:
Upon reception of SYSTEM INFORMATION DELIVERY COMMAND message, the gNB-DU Configuration Update procedure may be performed , and as part of such procedure the gNB-DU shall include the Dedicated SI Delivery Needed UE List IE in GNB-DU CONFIGURATION UPDATE message for UEs that are unable to receive system information from broadcast.
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8.6.1.3  Abnormal ConditionsWord‑p. 65
Not applicable.

8.7  Paging procedures

8.7.1  Paging

8.7.1.1  General

The purpose of the Paging procedure is used to provide the paging information to enable the gNB-DU to page a UE. The procedure uses non-UE associated signalling.

8.7.1.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.7.1.2-1: Paging procedure. Successful operation.
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The gNB-CU initiates the procedure by sending a PAGING message.
The Paging DRX IE may be included in the PAGING message, and if present the gNB-DU may use it to determine the final paging cycle for the UE.
The Paging Priority IE may be included in the PAGING message, and if present the gNB-DU may use it according to TS 23.501.
At the reception of the PAGING message, the gNB-DU shall perform paging of the UE in cells which belong to cells as indicated in the Paging Cell List IE.
The Paging Origin IE may be included in the PAGING message, and if present the gNB-DU shall transfer it to the UE.
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8.7.1.3  Abnormal Conditions

Not applicable.

8.8  Trace Procedures |R16|

8.8.1  Trace Start

8.8.1.1  General

The purpose of the Trace Start procedure is to allow the gNB-CU to request the gNB-DU to initiate a trace session for a UE. The procedure uses UE-associated signalling.

8.8.1.2  Successful OperationWord‑p. 66
Reproduction of 3GPP TS 38.473, Figure 8.8.1.2-1: Trace start procedure: Successful Operation.
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Upon reception of the TRACE START message, the gNB-DU shall initiate the requested trace session for the requested UE, as described in TS 32.422. In particular, the gNB-DU shall, if supported:
  • if the Trace Activation IE includes the MDT Activation IE set to "Immediate MDT and Trace" initiate the requested trace session and MDT session as described in TS 32.422;
  • if the Trace Activation IE includes the MDT Activation IE set to "Immediate MDT Only" initiate the requested MDT session as described in TS 32.422 and the gNB-DU shall ignore Interfaces To Trace IE, and Trace Depth IE;
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    8.8.1.3  Abnormal Conditions

    Void.

    8.8.2  Deactivate Trace

    8.8.2.1  General

    The purpose of the Deactivate Trace procedure is to allow the gNB-CU to request the gNB-DU to stop the trace session for the indicated trace reference. The procedure uses UE-associated signalling.

    8.8.2.2  Successful Operation

    Reproduction of 3GPP TS 38.473, Figure 8.8.2.2-1: Deactivate trace procedure: Successful Operation
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    Upon reception of the DEACTIVATE TRACE message, the gNB-DU shall stop the trace session for the indicated trace reference contained in the Trace ID IE, as described in TS 32.422.

    8.8.2.3  Abnormal Conditions

    Void.

    8.8.3  Cell Traffic TraceWord‑p. 67

    8.8.3.1  General

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

    8.8.3.2  Successful Operation

    Reproduction of 3GPP TS 38.473, Figure 8.8.3.2-1: Cell Traffic Trace procedure. Successful operation.
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    The procedure is initiated with a CELL TRAFFIC TRACE message sent from the gNB-DU to the gNB-CU.
    If the Privacy Indicator IE is included in the message, the gNB-CU shall store the information so that it can be transferred towards the AMF.

    8.8.3.3  Abnormal Conditions

    Void.

    8.9  Radio Information Transfer procedures |R16|

    8.9.1  DU-CU Radio Information Transfer

    8.9.1.1  General

    The purpose of the DU-CU Radio Information Transfer procedure is to transfer radio-related information from the gNB-DU to the gNB-CU. The procedure uses non-UE-associated signalling.

    8.9.1.2  Successful operation

    Reproduction of 3GPP TS 38.473, Figure 8.9.1.2-1: DU-CU Radio Information Transfer procedure.
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    The gNB-DU initiates the procedure by sending the DU-CU RADIO INFORMATION TRANSFER message to the gNB-CU.
    The gNB-CU considers that the RIM-RS Detection Status IE indicates the RIM-RS detection status of the cell identified by Aggressor Cell ID IE.

    8.9.1.3  Abnormal ConditionsWord‑p. 68
    Not applicable.

    8.9.2  CU-DU Radio Information Transfer

    8.9.2.1  General

    The purpose of the CU-DU Radio Information Transfer procedure is to transfer radio-related information from the gNB-CU to the gNB-DU. The procedure uses non-UE-associated signalling.

    8.9.2.2  Successful operation

    Reproduction of 3GPP TS 38.473, Figure 8.9.2.2-1: CU-DU Radio Information Transfer procedure.
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    The gNB-CU initiates the procedure by sending the CU-DU RADIO INFORMATION TRANSFER message to the gNB-DU. The gNB-DU considers that the RIM-RS Detection Status IE indicates the detection status of RIM-RS associated with Victim gNB Set ID IE.

    8.9.2.3  Abnormal Conditions

    Not applicable.

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