8.3.14 Trace Start

38.4233GPPNG-RANRelease 17TSXn Application Protocol (XnAP)

8.3.14.1 General

The purpose of the Trace Start procedure is to allow the M-NG-RAN node to request the S-NG-RAN node to initiate a trace session for a UE. The procedure uses UE-associated signalling.

8.3.14.2 Successful Operation

Figure 8.3.14.2-1: Trace Start, successful operation

The Trace Start procedure is initiated by the M-NG-RAN sending the TRACE START message to the S-NG-RAN for that specific UE. Upon reception of the TRACE START message, the S-NG-RAN node shall initiate the requested trace session as described in TS 32.422 [23].

If the Trace Activation IE includes

– the MDT Activation IE set to "Immediate MDT and Trace", and if the S-NG-RAN node is a gNB, it shall, if supported, initiate the requested trace session and MDT session as described in TS 32.422[23].

– the MDT Activation IE set to "Immediate MDT Only"or "Logged MDT only", and if the S-NG-RAN node is a gNB, it shall, if supported, initiate the requested MDT session as described in TS 32.422[23] and the S-NG-RAN node shall ignore the Interfaces To Trace IE and the Trace Depth IE.

– the MDT Location Information IE, within the MDT Configuration IE, and if the S-NG-RAN node is a gNB, it shall, if supported, store this information and take it into account in the requested MDT session.

– the MDT Activation IE set to "Immediate MDT Only" or "Logged MDT only", and if the Signalling based MDT PLMN List IE is included in the MDT Configuration IE, and if the S-NG-RAN node is gNB, it may use it to propagate the MDT Configuration as described in TS 37.320 [43].

– the Bluetooth Measurement Configuration IE, within the MDT Configuration IE, and if the S-NG-RAN node is a gNB, it shall, if supported, take it into account for MDT Configuration as described in TS 37.320 [43].

– the WLAN Measurement Configuration IE, within the MDT Configuration IE, and if the S-NG-RAN node is a gNB, it shall, if supported, take it into account for MDT Configuration as described in TS 37.320 [43].

– the Sensor Measurement Configuration IE, within the MDT Configuration IE, the S-NG-RAN node shall take it into account for MDT Configuration as described in TS 37.320 [43].

– the MDT Configuration IE, and if the S-NG-RAN Node is a gNB at least the MDT Configuration-NR IE shall be present, while if the S-NG-RAN Node is an ng-eNB at least the MDT Configuration-EUTRA IE shall be present.

8.3.14.3 Abnormal Conditions

Void.