4.3 Functional entities
23.5863GPPArchitectural Enhancements to support Ranging based services and Sidelink PositioningRelease 18TS
Editor’s note: This clause defines the functional entities introduced in the architectural reference model.
4.3.1 UE
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the UE may support the following functions:
– Reporting the following Ranging/SL Positioning capabilities to 5GC over the N1 reference point:
– Capability of supporting Ranging/SL Positioning over PC5;
NOTE: Based on Ranging/SL Positioning control, a UE capable of Ranging/SL Positioning may take different roles in the operation, e.g. Target UE, Reference UE, Located UE, Positioning Server UE, Positioning Client UE.
– Procedures for Ranging/SL Positioning over PC5;
– Procedures to Network assisted SL Positioning;
– Procedures to Ranging/SL Positioning service exposure;
– Indicating UE Policy Provisioning Request in UE Policy Container for UE triggered Ranging/SL Positioning Policy provisioning, which requests one or multiple types of policies/parameters as listed below:
– Policy/parameters for Ranging/SL Positioning over PC5;
– Policy/parameters for Located UE;
– Policy/parameters for Target UE in addition to the functions defined in TS 23.273 [8] clause 4.3.5;
– Policy/parameters for SL Positioning Client UE;
– Policy/parameters for SL Positioning Server UE;
– Receiving the Ranging/SL Positioning Policy from 5GC over N1 reference point.
– Configuration of parameters for Ranging/SL Positioning over PC5. These parameters can be pre-configured in the UE, or, if in coverage, provisioned or updated by signalling over the N1 reference point from the PCF in the HPLMN or over SR1 reference point from the Ranging/SL Positioning Application Server.
4.3.2 PCF
In addition to the functions defined in TS 23.501 [2] and TS 23.503 [4], the PCF includes functions to provision the UE with necessary policies and parameters to use Ranging/SL Positioning services, as part of the UE Ranging/SL Positioning Policy information as defined in TS 23.503 [4] clause 4.2.2:
– Authorization policy and parameters for Ranging/SL Positioning over PC5;.
– Authorization policy and parameters for Network assisted SL Positioning;
– Authorization policy and Ranging/SL Positioning service exposure;
The PCF may update the Ranging/SL Positioning to the UE under certain conditions.
When receiving the Ranging/SL Positioning in Npcf_UEPolicyControl_Create Request from the AMF or when receiving the updated subscription data from UDR, the PCF generates the PC5 QoS parameters used by NG-RAN corresponding to a UE as defined in clause 5.4.2 of TS 23.287 [6].
Editor’s note: It is FFS what the Ranging/SL positioning QoS parameters are, whether the Ranging/SL positioning QoS parameters are needed and how to use the Ranging/SL positioning QoS parameters.
4.3.3 AMF
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the AMF performs the following functions:
– Select a PCF supporting Ranging/SL positioning Policy/Parameter provisioning based on indication of Ranging/SL positioning Capability as part of the 5G ProSe Capability/V2X capability in the "5GMM capability" in the Registration Request.
– Store the Ranging/SL positioning Capability.
– Forward the Ranging/SL positioning Capability of Target UE to LMF.
– Forward the Ranging/SL positioning Capability to PCF.
– Obtain from UDM the subscription information related to Ranging/SL positioning and store them as part of the UE context data.
– Provision the NG-RAN with indication about the UE authorization status about Ranging/SL Positioning over PC5 (i.e. as Ranging/SL positioning-enabled UE);
– Provision the NG-RAN with PC5 QoS parameters related to Ranging/SL positioning over PC5.
Editor’s note: It is FFS what the Ranging/SL positioning QoS parameters are, whether the Ranging/SL positioning QoS parameters are needed and how to use the Ranging/SL positioning QoS parameters.
4.3.4 UDM
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the UDM performs the following functions:
– Subscription management for Ranging/SL Positioning over PC5.
– Subscription management for Network assisted SL Positioning.
– Subscription management for Ranging/SL Positioning service exposure.
4.3.5 UDR
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the UDR performs the following functions:
– Stores Ranging/SL Positioning service parameters.
4.3.6 NRF
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the NRF performs the following functions:
– PCF discovery by considering Ranging/SL Positioning Capability.
– LMF discovery by considering Ranging/SL Positioning Capability.
4.3.7 NEF
In addition to the functions defined in TS 23.287 [6] and TS 23.304 [7], the NEF supports the following:
– To enable AFs to provide service specific information to the 3GPP network, the NEF supports additional service parameters for Ranging/SL Positioning policy which can use the description if the clause 6.2.5 in TS 23.304 [7].
– Interacting with GMLC for AFs and UEs in Ranging/SL Positioning procedures to perform MT-LR.
4.3.8 LMF
In addition to the functions defined in TS 23.273 [8], the LMF supports the following:
– The Network assisted SL Positioning;
– Trigger Ranging/Sidelink positioning.
– Exchange the Ranging/Sidelink Positioning capability.
– Exchange the Ranging/Sidelink Positioning assistant data.
– Exchange Ranging/Sidelink positioning signal measurement data/result.
– Support of receiving stored Ranging/Sidelink Positioning capability from AMF and support of providing updated Ranging/Sidelink Positioning capability to AMF.
– Determine the location of the Target UE based on the ranging/SL positioning measurement data or result reported by Target UE.
– Delivering the Ranging/Sidelink positioning service request/response for the Ranging service exposure to UE.
– Resolve the Application Layer ID of the UE involved in Sidelink Positioning.
4.3.9 GMLC
In addition to the functions defined in TS 23.273 [8], the GMLC supports the following:
– enable trusted AFs and NFs to perform MT-LR by accessing GMLC directly with additional service parameters for Ranging/SL Positioning.
– enable AFs and NFs to perform MT-LR by accessing GMLC through NEF with additional service parameters for Ranging/SL Positioning.
– determine the serving AMF instances for the UEs involved in the Ranging/SL Positioning request and forward the request to respective serving AMF
– receive response from AMF and event reports from and return Ranging/SL Positioning result to NFs and AFs.