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Content for  TS 38.455  Word version:  16.1.0

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8  NRPPa proceduresWord‑p. 13

8.1  Elementary procedures

In the following tables, all EPs are divided into Class 1 and Class 2 EPs.
Elementary Procedure
Initiating Message
Successful Outcome Response message
Unsuccessful Outcome Response message

E-CID Measurement Initiation
E-CID MEASUREMENT INITIATION REQUEST
E-CID MEASUREMENT INITIATION RESPONSE
E-CID MEASUREMENT INITIATION FAILURE
OTDOA Information Exchange
OTDOA INFORMATION REQUEST
OTDOA INFORMATION RESPONSE
OTDOA INFORMATION FAILURE
Positioning Information Exchange
POSITIONING INFORMATION REQUEST
POSITIONING INFORMATION RESPONSE
POSITIONING INFORMATION FAILURE
TRP Information Exchange
TRP INFORMATION REQUEST
TRP INFORMATION RESPONSE
TRP INFORMATION FAILURE
Measurement
MEASUREMENT REQUEST
MEASUREMENT RESPONSE
MEASUREMENT FAILURE
Positioning Activation
POSITIONING ACTIVATION REQUEST
POSITIONING ACTIVATION RESPONSE
POSITIONING ACTIVATION FAILURE

 
Elementary Procedure
Initiating Message

E-CID Measurement Failure Indication
E-CID MEASUREMENT FAILURE INDICATION
E-CID Measurement Report
E-CID MEASUREMENT REPORT
E-CID Measurement Termination
E-CID MEASUREMENT TERMINATION COMMAND
Error Indication
ERROR INDICATION
Assistance Information Control
ASSISTANCE INFORMATION CONTROL
Assistance Information Feedback
ASSISTANCE INFORMATION FEEDBACK
Positioning Information Update
POSITIONING INFORMATION UPDATE
Measurement Report
MEASUREMENT REPORT
Measurement Update
MEASUREMENT UPDATE
Measurement Abort
MEASUREMENT ABORT
Measurement Failure Indication
MEASUREMENT FAILURE INDICATION
Positioning Deactivation
POSITIONING DEACTIVATION

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8.2  Location Information Transfer ProceduresWord‑p. 14

8.2.1  E-CID Measurement Initiation

8.2.1.1  General

The purpose of E-CID Measurement Initiation procedure is to allow the LMF to request the NG-RAN node to report E-CID measurements used by LMF to compute the location of the UE.

8.2.1.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.1.2-1: E-CID Measurement Initiation procedure, successful operation
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The LMF initiates the procedure by sending an E-CID MEASUREMENT INITIATION REQUEST message. If the NG-RAN node 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-ID" have been requested.
If the Report Characteristics IE is set to "OnDemand", the NG-RAN node shall return the result of the measurement in the E-CID MEASUREMENT INITIATION RESPONSE message including, if available, the NG-RAN Access Point Position IE in the E-CID Measurement Result IE, and the LMF shall consider that the E-CID measurements for the UE has been terminated by the NG-RAN node. If available, the NG-RAN node shall include the Cell Portion ID IE in the E-CID MEASUREMENT INITIATION RESPONSE message. Upon reception of the Cell Portion ID IE, the LMF may use the value as the cell portion for the measurement. If the Report Characteristics IE is set to "OnDemand" and the Inter-RAT Measurement Quantities IE is included in the E-CID MEASUREMENT INITIATION REQUEST message, the NG-RAN node shall, if supported, provide the corresponding measurements, if available in the NG-RAN node, in the Inter-RAT Measurement Result IE in E-CID MEASUREMENT INITIATION RESPONSE message. If the Report Characteristics IE is set to "OnDemand" and the WLAN Measurement Quantities IE is included in the E-CID MEASUREMENT INITIATION REQUEST message, the NG-RAN node shall, if supported, provide the corresponding measurements, if available in the NG-RAN node, in the WLAN Measurement Result IE in E-CID MEASUREMENT INITIATION RESPONSE message.
If the Report Characteristics IE is set to "Periodic", the NG-RAN node 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 NG-RAN node shall then periodically initiate the E-CID Measurement Report procedure for the measurements, with the requested reporting periodicity.
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8.2.1.3  Unsuccessful OperationWord‑p. 15
Reproduction of 3GPP TS 38.455, Figure 8.2.1.3-1: E-CID Measurement Initiation procedure, unsuccessful operation
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If the NG-RAN node is not able to initiate at least one of the requested E-CID measurements, the NG-RAN node shall respond with an E-CID MEASUREMENT INITIATION FAILURE message.

8.2.2  E-CID Measurement Failure Indication

8.2.2.1  General

The purpose of the E-CID Measurement Failure Indication procedure is for the NG-RAN node to notify the LMF that the E-CID measurements previously requested with the E-CID Measurement Initiation procedure can no longer be reported.

8.2.2.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.2.2-1: E-CID Measurement Failure Indication, successful operation
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Upon reception of the E-CID MEASUREMENT FAILURE INDICATION message, the LMF shall consider that the E-CID measurements for the UE have been terminated by the NG-RAN node.

8.2.2.3  Unsuccessful Operation

Not applicable.

8.2.3  E-CID Measurement ReportWord‑p. 16

8.2.3.1  General

The purpose of E-CID Measurement Report procedure is for the NG-RAN node to provide the E-CID measurements for the UE to the LMF.

8.2.3.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.3.2-1: E-CID Measurement Report procedure, successful operation
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The NG-RAN node 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-ID" have been requested.
If available, the NG-RAN node shall include the NG-RAN Access Point Position IE or the Geographical Coordinates IE which is the configured estimated serving antenna position in the E-CID Measurement Result IE within the E-CID MEASUREMENT REPORT message. Upon reception of this NG-RAN Access Point Position IE, the LMF may use the value as the geographical position of the NG-RAN access point.
If available, the NG-RAN node shall include the Cell Portion ID IE in the E-CID MEASUREMENT REPORT message. Upon reception of the Cell Portion ID IE, the LMF may use the value as the cell portion for the measurement.
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8.2.3.3  Unsuccessful Operation

Not applicable.

8.2.4  E-CID Measurement Termination

8.2.4.1  General

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

8.2.4.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.4.2-1: E-CID Measurement Termination procedure, successful operation
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The LMF initiates the procedure by generating an E-CID MEASUREMENT TERMINATION COMMAND message.

8.2.4.3  Unsuccessful OperationWord‑p. 17
Not applicable.

8.2.5  OTDOA Information Exchange

8.2.5.1  General

The purpose of the OTDOA Information Exchange procedure is to allow the LMF to request the NG-RAN node to transfer OTDOA information to the LMF.

8.2.5.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.5.2-1: OTDOA Information Exchange procedure, successful operation
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The LMF initiates the procedure by sending an OTDOA INFORMATION REQUEST message. The NG-RAN node responds with OTDOA INFORMATION RESPONSE message that contains the available OTDOA information applicable to the relevant cells/TPs.

8.2.5.3  Unsuccessful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.5.3-1: OTDOA Information Exchange procedure, unsuccessful operation
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If the NG-RAN node does not have any OTDOA information to report, the NG-RAN node shall respond with an OTDOA INFORMATION FAILURE message.

8.2.6  Positioning Information Exchange

8.2.6.1  General

The Positioning Information Exchange procedure is initiated by the LMF to request to the NG-RAN node positioning information for the UE.

8.2.6.2  Successful OperationWord‑p. 18
Reproduction of 3GPP TS 38.455, Figure 8.2.6.2-1: Positioning Information Exchange procedure, successful operation
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The LMF initiates the procedure by sending a POSITIONING INFORMATION REQUEST message to the NG-RAN node.
If the Requested SRS Transmission Characteristics IE is included in the POSITIONING INFORMATION REQUEST message, the NG-RAN node 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.

8.2.6.3  Unsuccessful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.6.3-1: Positioning Information Exchange procedure, unsuccessful operation
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If the NG-RAN node is unable to configure any SRS transmissions for the UE, it shall respond with a POSITIONING INFORMATION FAILURE message. If a handover of the target UE has been triggered, the NG-RAN node shall send a POSITIONING INFORMATION FAILURE message with an appropriate cause value.

8.2.6.4  Abnormal Conditions

Void.

8.2.7  Positioning Information Update

8.2.7.1  General

The Positioning Information Update procedure is initiated by the NG-RAN node to indicate to the LMF that a change has occurred in the SRS configuration.

8.2.7.2  Successful OperationWord‑p. 19
Reproduction of 3GPP TS 38.455, Figure 8.2.7.2-1: Positioning Information Update procedure, successful operation
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The NG-RAN node initiates the procedure by sending a POSITIONING INFORMATION UPDATE message to the LMF. This message shall include the SRS configuration information for all cells where the SRS configuration has changed.

8.2.7.3  Unsuccessful Operation

Not Applicable.

8.2.7.4  Abnormal Conditions

Void.

8.2.8  TRP Information Exchange

8.2.8.1  General

The purpose of the TRP Information Exchange procedure is to allow the LMF to request the NG-RAN node to provide detailed information for TRPs hosted by the NG-RAN node.

8.2.8.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.8.2-1: TRP Information Exchange procedure, successful operation
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The LMF initiates the procedure by sending a TRP INFORMATION REQUEST message. The NG-RAN node responds with a TRP INFORMATION RESPONSE message that contains the requested TRP information.
If the LMF includes the TRP List IE in the TRP INFORMATION REQUEST message, the NG-RAN node should include in the TRP INFORMATION RESPONSE message, the requested information for all TRPs included in the TRP List IE.
If the LMF does not include the TRP List IE in the TRP INFORMATION REQUEST message, the NG-RAN node should include the requested information for all TRPs hosted by the NG-RAN node in the TRP INFORMATION RESPONSE message
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8.2.8.3  Unsuccessful OperationWord‑p. 20
Reproduction of 3GPP TS 38.455, Figure 8.2.8.3-1: TRP Information Exchange procedure, unsuccessful operation
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If the NG-RAN node cannot provide any of the requested information for any TRP, the NG-RAN node shall respond with a TRP INFORMATION FAILURE message.

8.2.9  Positioning Activation

8.2.9.1  General

The Positioning Activation procedure is initiated by the LMF to request the NG-RAN node to activate semi-persistent or trigger aperiodic UL SRS transmission by the UE.

8.2.9.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.9.2-1: Positioning Activation procedure, successful operation
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The LMF initiates the procedure by sending a POSITIONING ACTIVATION REQUEST message to the NG-RAN node.
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 NG-RAN node shall respond with a POSITIONING ACTIVATION RESPONSE message.

8.2.9.3  Unsuccessful OperationWord‑p. 21
Reproduction of 3GPP TS 38.455, Figure 8.2.9.3-1: Positioning Activation procedure, unsuccessful operation
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If the NG-RAN node is unable to activate UL SRS transmission in the UE, it shall respond with a POSITIONING ACTIVATION FAILURE message.

8.2.9.4  Abnormal Conditions

Void.

8.2.10  Positioning Deactivation

8.2.10.1  General

The Positioning Deactivation procedure is initiated by the LMF to indicate to the NG-RAN node that UL SRS transmission should be deactivated in the UE.

8.2.10.2  Successful Operation

Reproduction of 3GPP TS 38.455, Figure 8.2.10.2-1: Positioning Deactivation procedure, successful operation
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The LMF initiates the procedure by sending a POSITIONING DEACTIVATION message to the NG-RAN node. This message shall include an indication of the UL SRS resource set to be deactivated or release all the related resources.

8.2.10.3  Unsuccessful Operation

Not Applicable.

8.2.10.4  Abnormal Conditions

Void.


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