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Content for  TS 38.473  Word version:  16.3.1

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8.13  Positioning Procedures |R16|

8.13.1  Positioning Assistance Information Control

8.13.1.1  General

The purpose of the Positioning Assistance Information Control procedure is to allow the gNB-CU to signal positioning assistance information to the gNB-DU for positioning assistance information broadcasting.

8.13.1.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.1.2-1: Positioning Assistance Information Control procedure
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The gNB-CU initiates the procedure by sending a POSITIONING ASSISTANCE INFORMATION CONTROL message.
If the Positioning Assistance Information IE is included in the POSITIONING ASSISTANCE INFORMATION CONTROL message, the gNB-DU shall replace any previously stored positioning assistance information and use the received information to configure positioning assistance information broadcasting.
If the Broadcast IE is included in the POSITIONING ASSISTANCE INFORMATION CONTROL message and set to "start", the gNB-DU may start broadcasting the positioning assistance information. If the Broadcast IE is included in the POSITIONING ASSISTANCE INFORMATION CONTROL message and set to "stop", the gNB-DU may stop broadcasting the positioning assistance information.
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8.13.1.3  Abnormal ConditionsWord‑p. 75
If the Broadcast IE is included in the POSITIONING ASSISTANCE INFORMATION CONTROL message and set to "start", and no positioning assistance information is available, the gNB-DU shall consider the procedure as failed.
If neither the Positioning Assistance Information IE nor the Broadcast IE are included in the POSITIONING ASSISTANCE INFORMATION CONTROL message, the gNB-DU shall consider the procedure as failed.

8.13.2  Positioning Assistance Information Feedback

8.13.2.1  General

The purpose of the Positioning Assistance Information Feedback procedure is to allow the gNB-DU to give feedback to the gNB-CU on positioning assistance information broadcasting.

8.13.2.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.2.2-1: Positioning Assistance Information Feedback procedure
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If the Positioning Assistance Information Failure List IE is included in the POSITIONING ASSISTANCE INFORMATION FEEDBACK message, the gNB-CU shall consider that positioning assistance information broadcasting could not be configured for the relevant information.

8.13.2.3  Abnormal Conditions

Void.

8.13.3  Positioning Measurement

8.13.3.1  General

The purpose of the Positioning Measurement procedure is to exchange positioning information. The procedure uses non-UE-associated signalling when used to request positioning measurements.

8.13.3.2  Successful OperationWord‑p. 76
Reproduction of 3GPP TS 38.473, Figure 8.13.3.2-1: Positioning Measurement procedure: successful operation
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The gNB-CU initiates the procedure by sending a POSITIONING MEASUREMENT REQUEST message to the gNB-DU, indicating in the TRP List IE the TRP(s) from which measurements are requested. The gNB-DU node shall use the included information to configure positioning measurements by the indicated TRP(s). If at least one of the requested measurements has been successful for at least one of the TRPs, the gNB-DU shall reply with the POSITIONING MEASUREMENT RESPONSE message.
If the Positioning Report Characteristics IE is set to "OnDemand", the gNB-DU shall return the corresponding measurement results in the Positioning Measurement Result List IE in the POSITIONING MEASUREMENT RESPONSE message, and the gNB-CU shall consider that this reporting has been terminated by the gNB-DU.
If the Positioning Report Characteristics IE is set to "Periodic", the gNB-DU shall initiate the corresponding measurement, and it shall reply with the POSITIONING MEASUREMENT RESPONSE message without including any measurement results in the message. The gNB-DU shall then periodically initiate the Positioning Measurement Report procedure for the corresponding measurements, with the requested reporting periodicity.
If the Measurement Beam Information Request IE is included in the POSITIONING MEASUREMENT REQUEST message, the gNB-DU node shall include the Measurement Beam Information IE in the Measurement Result IE of the POSITIONING MEASUREMENT RESPONSE message
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8.13.3.3  Unsuccessful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.3.3-1: Positioning Measurement procedure: unsuccessful operation
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If the gNB-DU is unable to provide the requested positioning measurements for any of the TRPs in the TRP List IE of the POSITIONING MEASUREMENT REQUEST message, it shall respond with a POSITIONING MEASUREMENT FAILURE message.

8.13.3.4  Abnormal Conditions

If the gNB-DU receives a POSITIONING MEASUREMENT REQUEST message containing an LMF Measurement ID corresponding to an ongoing positioning measurement, it shall consider the procedure as failed and initiate local error handling.

8.13.4  Positioning Measurement ReportWord‑p. 77

8.13.4.1  General

The purpose of the Positioning Measurement Report procedure is for the gNB-DU to report positioning measurements to the gNB-CU.

8.13.4.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.4.2-1: Positioning Measurement Report procedure: successful operation
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The gNB-DU initiates the procedure by sending a POSITIONING MEASUREMENT REPORT message. The POSITIONING MEASUREMENT REPORT message contains the positioning measurement results according to the measurement configuration in the respective POSITIONING MEASUREMENT REQUEST message.

8.13.4.3  Unsuccessful Operation

Not applicable.

8.13.4.4  Abnormal Conditions

Not applicable.

8.13.5  Positioning Measurement Abort

8.13.5.1  General

The purpose of the Positioning Measurement Abort procedure is to enable the gNB-CU to abort an on-going measurement.

8.13.5.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.5.2-1: Positioning Measurement Abort procedure: successful operation
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The gNB-CU initiates the procedure by generating a POSITIONING MEASUREMENT ABORT message. Upon receiving this message, the gNB-DU shall terminate the on-going measurement identified by the LMF Measurement ID IE and may release any resources previously allocated for the same measurement.

8.13.5.3  Unsuccessful OperationWord‑p. 78
Not applicable.

8.13.5.4  Abnormal Conditions

If the gNB-DU cannot identify the previously requested measurement to be aborted, it shall ignore the POSITIONING MEASUREMENT ABORT message.

8.13.6  Positioning Measurement Failure Indication

8.13.6.1  General

The purpose of the Positioning Measurement Failure Indication procedure is for the gNB-DU to notify the gNB-CU that the positioning measurements previously requested with the Positioning Measurement procedure can no longer be reported.

8.13.6.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.6.2-1: Positioning Measurement Failure Indication procedure: successful operation
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Upon reception of the POSITIONING MEASUREMENT FAILURE INDICATION message, the gNB-CU shall consider that the positioning measurements have been terminated by the gNB-DU.

8.13.6.3  Unsuccessful Operation

Not applicable.

8.13.6.4  Abnormal Conditions

Not applicable.

8.13.7  Positioning Measurement Update

8.13.7.1  General

The purpose of the Positioning Measurement Update procedure is to modify one or more periodic positioning measurements performed by the gNB-DU.

8.13.7.2  Successful OperationWord‑p. 79
Reproduction of 3GPP TS 38.473, Figure 8.13.7.2-1: Positioning Measurement Update procedure: successful operation
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The gNB-CU initiates the procedure by generating a POSITIONING MEASUREMENT UPDATE message. Upon receiving the message, the gNB-DU shall overwrite the previously received measurement configuration for the corresponding measurements.

8.13.7.3  Unsuccessful Operation

Not applicable.

8.13.7.4  Abnormal Conditions

If the gNB-DU cannot identify the given positioning measurements, it shall regard the procedure as failed and initiate local error handling.

8.13.8  TRP Information Exchange

8.13.8.1  General

The purpose of the TRP Information Exchange procedure is to allow the gNB-CU to request the gNB-DU to provide detailed information for TRPs hosted by the gNB-DU.

8.13.8.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.8.2-1: TRP Information Exchange procedure, successful operation
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The gNB-CU initiates the procedure by sending a TRP INFORMATION REQUEST message. The gNB-DU responds with a TRP INFORMATION RESPONSE message that contains the requested TRP information. The gNB-DU includes information for all TRPs hosted by the gNB-DU in the TRP INFORMATION RESPONSE message.

8.13.8.3  Unsuccessful OperationWord‑p. 80
Reproduction of 3GPP TS 38.473, Figure 8.13.8.3-1: TRP Information Exchange procedure, unsuccessful operation
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If the gNB-DU cannot provide any of the requested information, the gNB-DU shall respond with a TRP INFORMATION FAILURE message.

8.13.9  Positioning Information Exchange

8.13.9.1  General

The Positioning Information Exchange procedure is initiated by the gNB-CU to indicate to the gNB-DU the need to configure the UE to transmit SRS signals and to retrieve the SRS configuration from the gNB-DU.

8.13.9.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.9.2-1: Positioning Information Exchange procedure, successful operation
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The gNB-CU initiates the procedure by sending a POSITIONING INFORMATION REQUEST message to the gNB-DU. The gNB-DU shall reply with the POSITIONING INFORMATION RESPONSE message.
If the Requested SRS Transmission Characteristics IE is included in the POSITIONING INFORMATION REQUEST message, the gNB-DU may take this information into account when configuring SRS transmissions for the UE, and it shall include the SRS Configuration IE and the SFN Initialisation Time IE in the POSITIONING INFORMATION RESPONSE message.
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8.13.9.3  Unsuccessful OperationWord‑p. 81
Reproduction of 3GPP TS 38.473, Figure 8.13.9.3-1: Positioning Information Exchange procedure, unsuccessful operation
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If the gNB-DU is unable to configure any SRS transmissions for the UE, the gNB-DU shall respond with a POSITIONING INFORMATION FAILURE message. If a handover of the target UE has been triggered, the gNB-DU shall send a POSITIONING INFORMATION FAILURE message with an appropriate cause value.

8.13.10  Positioning Activation

8.13.10.1  General

The Positioning Activation procedure is initiated by the gNB-CU to request the gNB-DU to activate semi-persistent or trigger aperiodic UL SRS transmission by the UE. The procedure uses UE-associated signalling.

8.13.10.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.10.2-1: Positioning Activation procedure, successful operation
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The gNB-CU initiates the procedure by sending a POSITIONING ACTIVATION REQUEST message to the gNB-DU.
The message includes an indication of the UL SRS resource set to be activated. For semi-persistent UL SRS, the message also indicates the spatial relation for the semi-persistent UL SRS resource to be activated.
Following successful activation of UL SRS transmission in the UE, the gNB-DU shall respond with a POSITIONING ACTIVATION RESPONSE message.

8.13.10.3  Unsuccessful OperationWord‑p. 82
Reproduction of 3GPP TS 38.473, Figure 8.13.10.3-1: Positioning Activation procedure, unsuccessful operation
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If the gNB-DU is unable to activate UL SRS transmission in the UE, it shall respond with a POSITIONING ACTIVATION FAILURE message.

8.13.10.4  Abnormal Conditions

Void.

8.13.11  Positioning Deactivation

8.13.11.1  General

The Positioning Deactivation procedure is initiated by the gNB-CU to indicate to the gNB-DU node that UL SRS transmission should be deactivated in the UE. The procedure uses UE-associated signalling.

8.13.11.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.11.2-1: Positioning Deactivation procedure, successful operation
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The gNB-CU initiates the procedure by sending a POSITIONING DEACTIVATION message to the gNB-DU. This message shall include an indication of the UL SRS resource set to be deactivated.

8.13.11.3  Unsuccessful Operation

Not Applicable.

8.13.11.4  Abnormal Conditions

Void.

8.13.12  E-CID Measurement InitiationWord‑p. 83

8.13.12.1  General

The purpose of E-CID Measurement Initiation procedure is to allow the gNB-CU to request the gNB-DU to report E-CID measurements used by LMF to compute the location of the UE.

8.13.12.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.12.2-1: E-CID Measurement Initiation procedure, successful operation
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The gNB-CU initiates the procedure by sending an E-CID MEASUREMENT INITIATION REQUEST message. If the gNB-DU is able to initiate the requested E-CID measurements, it shall reply with the E-CID MEASUREMENT INITIATION RESPONSE message.
The Measured Results IE shall be included in the E-CID Measurement Result IE of the E-CID MEASUREMENT INITIATION RESPONSE message when measurement results other than the "Cell Portion" have been requested.
If the E-CID Report Characteristics IE is set to "OnDemand", the gNB-DU shall return the result of the measurement in the E-CID MEASUREMENT INITIATION RESPONSE message including, if available, the Geographical Coordinates IE in the E-CID Measurement Result IE, and the gNB-CU shall consider that the E-CID measurements for the UE has been terminated by the gNB-DU. If available, the gNB-DU shall include the Cell Portion ID IE in the E-CID MEASUREMENT INITIATION RESPONSE message.
If the E-CID Report Characteristics IE is set to "Periodic", the gNB-DU shall initiate the requested measurements and shall reply with the E-CID MEASUREMENT INITIATION RESPONSE message without including either the E-CID Measurement Result IE or the Cell Portion ID IE in this message. The gNB-DU shall then periodically initiate the E-CID Measurement Report procedure for the measurements, with the requested reporting periodicity.
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8.13.12.3  Unsuccessful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.12.3-1: E-CID Measurement Initiation procedure, unsuccessful operation
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If the gNB-DU is not able to initiate at least one of the requested E-CID measurements, the gNB-DU shall respond with an E-CID MEASUREMENT INITIATION FAILURE message.

8.13.13  E-CID Measurement Failure IndicationWord‑p. 84

8.13.13.1  General

The purpose of the E-CID Measurement Failure Indication procedure is for the gNB-DU to notify the gNB-CU that the E-CID measurements previously requested with the E-CID Measurement Initiation procedure can no longer be reported.

8.13.13.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.13.2-1: E-CID Measurement Failure Indication, successful operation
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Upon reception of the E-CID MEASUREMENT FAILURE INDICATION message, the gNB-CU shall consider that the E-CID measurements for the UE have been terminated by the gNB-DU.

8.13.13.3  Unsuccessful Operation

Not applicable.

8.13.14  E-CID Measurement Report

8.13.14.1  General

The purpose of E-CID Measurement Report procedure is for the gNB-DU to provide the E-CID measurements for the UE to the gNB-CU.

8.13.14.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.14.2-1: E-CID Measurement Report procedure, successful operation
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The gNB-DU initiates the procedure by sending an E-CID MEASUREMENT REPORT message. The E-CID MEASUREMENT REPORT message contains the E-CID measurement results according to the measurement configuration in the respective E-CID MEASUREMENT INITIATION REQUEST message.
The Measured Results IE shall be included in the E-CID Measurement Result IE of the E-CID MEASUREMENT REPORT message when measurement results other than the "Cell Portion" have been requested.
If available, the gNB-DU shall include the Geographical Coordinates IE in the E-CID Measurement Result IE in the E-CID MEASUREMENT REPORT message.
If available, the gNB-DU shall include the Cell Portion ID IE in the E-CID MEASUREMENT REPORT message.
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8.13.14.3  Unsuccessful OperationWord‑p. 85
Not applicable.

8.13.15  E-CID Measurement Termination

8.13.15.1  General

The purpose of E-CID Measurement Termination procedure is to terminate periodical E-CID measurements for the UE performed by the gNB-DU.

8.13.15.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.15.2-1: E-CID Measurement Termination procedure, successful operation
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The gNB-CU initiates the procedure by generating an E-CID MEASUREMENT TERMINATION COMMAND message.

8.13.15.3  Unsuccessful Operation

Not applicable.

8.13.16  Positioning Information Update

8.13.16.1  General

The Positioning Information Update procedure is initiated by the gNB-DU to indicate to the gNB-CU that a change has occurred in the SRS configuration.

8.13.16.2  Successful Operation

Reproduction of 3GPP TS 38.473, Figure 8.13.16.2-1: Positioning Information Update procedure, successful operation
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The gNB-DU initiates the procedure by sending a POSITIONING INFORMATION UPDATE message to the gNB-CU. This message shall include the SRS configuration information for all cells where the SRS configuration has changed.

8.13.16.3  Unsuccessful OperationWord‑p. 86
Not Applicable.

8.13.16.4  Abnormal Conditions

Void.

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