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.

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.

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.

Void.

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.

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.

Not applicable.

Void.

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.

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.

Not applicable.

Void.

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

The LMF initiates the procedure by generating an E-CID MEASUREMENT TERMINATION COMMAND message.

Not applicable.

Void.

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.

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.

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.

Void.

The Positioning Information Exchange procedure is initiated by the LMF to request to the NG-RAN node positioning information for the UE. This procedure applies only if the NG-RAN node is a gNB.

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. If the Spatial Relation Information per SRS Resource IE and the Periodicity List IE are both included in the Requested SRS Transmission Characteristics IE, the NG-RAN node shall consider that the Spatial Relation per SRS Resource Item IE and the Periodicity List Item IE have one-to-one mapping relation. If the UE Reporting Information IE is included in the POSITIONING INFORMATION REQUEST message, the NG-RAN node may take this information into account for allocating proper CG-SDT resources when positioning a UE. If the UE TEG Information Request IE is included in the POSITIONING INFORMATION REQUEST message and set to "onDemand", the NG-RAN node shall, if supported, provide the UE Tx TEG association in the POSITIONING INFORMATION RESPONSE message. If the UE TEG Information Request IE is set to "periodic", the NG-RAN node shall, if supported, reply with the POSITIONING INFORMATION RESPONSE message without including any UE Tx TEG association in this message. The NG-RAN node shall then take the UE TEG Reporting Periodicity IE into account when configuring the UE's periodic UE Tx TEG association reporting and initiate the Positioning Information Update procedure for reporting the UE Tx TEG association received from the UE, if any.

If the Requested SRS Transmission Characteristics IE is included in the POSITIONING INFORMATION REQUEST message and 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. If the NG-RAN node is unable to provide any of the requested information, the NG-RAN node shall respond with a POSITIONING INFORMATION FAILURE message with an appropriate cause value.

Void.

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 or in the UE Tx TEG association. This procedure applies only if the NG-RAN node is a gNB.

The NG-RAN node initiates the procedure by sending a POSITIONING INFORMATION UPDATE message to the LMF. If the SRS Configuration IE is included in the POSITIONING INFORMATION UPDATE message, the LMF shall consider this information as the updated SRS Configuration for the UE. If the SFN Initialisation Time IE is included in the POSITIONING INFORMATION UPDATE message, the LMF shall consider this information as the SFN Initialisation Time associated to the SRS Configuration. If the UE Tx TEG Association List IE is included in the POSITIONING INFORMATION UPDATE message, the LMF shall consider it as the UE Tx TEG association for the SRS resources that have changed their TEG association from the last update.

Not Applicable.

Void.

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. This procedure applies only if the NG-RAN node is a gNB.

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 TRP List IE is included 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 TRP List IE is not included 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 If the PRS Muting IE is included in the PRS Configuration IE in the TRP INFORMATION RESPONSE message, the LMF may take it into account as the muting information for the given PRS resource set. If the QCL Info IE is included in the PRS Configuration IE in the TRP INFORMATION RESPONSE message, the LMF may take it into account for the given PRS resource list. If the DL-PRS Resource Coordinates IE is included in the Geographical Coordinates IE in the TRP Information IE in the TRP INFORMATION RESPONSE message, the LMF may take it into account as the DL PRS Resource Coordinates relative to the TRP coordinate.

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.

Void.

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. This procedure applies only if the NG-RAN node is a gNB.

The LMF initiates the procedure by sending a POSITIONING ACTIVATION REQUEST message to the NG-RAN node. For semi-persistent UL SRS, the POSITIONING ACTIVATION REQUEST message includes an indication of the UL SRS resource set to be activated and may include the spatial relation for the semi-persistent UL SRS resource to be activated. For aperiodic UL SRS, if the SRS Resource Trigger IE is included in the POSITIONING ACTIVATION REQUEST message, the NG-RAN node shall take the value of this IE into account when triggering aperiodic SRS transmission by the UE. If the Activation Time IE is included in the POSITIONING ACTIVATION REQUEST message, the NG-RAN node shall take the indicated value as the LMF's requested time for activation of the UE's SRS transmission. Following successful activation of UL SRS transmission in the UE, the NG-RAN node shall respond with a POSITIONING ACTIVATION RESPONSE message. If the POSITIONING ACTIVATION RESPONSE message includes the System Frame Number and/or the Slot Number IEs, the LMF shall consider that the respective information indicates the activation time of SRS transmission by the UE.

If the NG-RAN node is unable to activate UL SRS transmission in the UE, it shall respond with a POSITIONING ACTIVATION FAILURE message. If the NG-RAN node is unable to trigger the aperiodic SRS transmission with the indicated SRS Resource Trigger IE, it shall respond with a POSITIONING ACTIVATION FAILURE message with an appropriate cause value.

Void.

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. This procedure applies only if the NG-RAN node is a gNB.

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.

Not Applicable.

Void.

The PRS Configuration Exchange procedure is initiated by the LMF to request the NG-RAN node to configure or update (i.e., turn off) PRS transmission. This procedure applies only if the NG-RAN node is a gNB.

The LMF initiates the procedure by sending a PRS CONFIGURATION REQUEST message to the NG-RAN. If the PRS Configuration Request Type IE is set to "configure", the NG-RAN node should use the information in the Requested DL PRS Transmission Characteristics IE to configure DL-PRS transmission by the indicated TRP(s). If the PRS Configuration Request Type IE is set to "off", the NG-RAN node should, if supported, use the information in the PRS Transmission Off Information IE to turn off the DL-PRS transmission for the indicated TRP(s), PRS Resource Set(s), or PRS Resource(s). If DL-PRS transmission is successfully configured or updated for at least one of the TRPs, the NG-RAN node shall respond with a PRS CONFIGURATION RESPONSE message.

If the NG-RAN node cannot configure or update DL-PRS transmission for any of the TRPs in the PRS TRP List IE of the PRS CONFIGURATION REQUEST message, it shall respond with a PRS CONFIGURATION FAILURE message with an appropriate cause value.

Void.

The Measurement Preconfiguration procedure allows the LMF to provide necessary information to the serving gNB and request the gNB to preconfigure measurement gap and/or PRS processing window for the UE. This procedure applies only if the NG-RAN node is a gNB.

The LMF initiates the procedure by sending a MEASUREMENT PRECONFIGURATION REQUIRED message. If the NG-RAN node is able to configure measurement gap or PRS processing window, it shall reply with the MEASUREMENT PRECONFIGURATION CONFIRM message.

If the NG-RAN node cannot configure any of the measurement gap or PRS processing window, the NG-RAN node shall respond with a MEASUREMENT PRECONFIGURATION REFUSE message. Upon receiving the MEASUREMENT PRECONFIGURATION REFUSE message, the LMF shall release the reserved PPW resources.

Void.

The Measurement Activation procedure is initiated by the LMF to request the NG-RAN node to activate or deactivate the preconfigured measurement gap or PRS processing window for the UE. This procedure applies only if the NG-RAN node is a gNB.

The LMF initiates the procedure by sending a MEASUREMENT ACTIVATION message to the NG-RAN node. If the PRS Measurement Info List IE is included in the MEASUREMENT ACTIVATION message, the NG-RAN node may take it into account when activating pre-configured measurement gap in the UE.

Not Applicable.

Void.