TS 23.273
5G System (5GS) Location Services (LCS)
V19.4.0 (PDF)
2025/09 … p.
V18.10.0
2025/06 173 p.
V17.11.0
2024/12 112 p.
V16.13.0
2024/12 100 p.
- Rapporteur:
- Mr. Ai, Ming
CATT
essential Table of Contents for TS 23.273 Word version: 19.4.0
each title, in the "available" or "not available yet" area, links to the equivalent title in the CONTENT
List of Figures and Tables
| Figure 4.2.1-1 | Non-roaming reference architecture for Location Services in reference point representation |
| Figure 4.2.1-2 | Non-roaming reference architecture for Location Services in SBI representation |
| Figure 4.2.2-1 | Roaming reference architecture for Location Services in reference point representation |
| Figure 4.2.2-2 | Roaming reference architecture for Location Services in SBI representation |
| Figure 4.2a.2-1 | Non-roaming architecture of interconnection between 5GC and EPC |
| Figure 4.2a.3-1 | Roaming architecture of Location Services for interconnection between 5GC and EPC (5GC GMLC and EPC GMLC are separately deployed in VPLMN) |
| Figure 4.2a.3-2 | Roaming architecture of Location Services for interconnection between 5GC and EPC (5GC GMLC and EPC GMLC are co-located in VPLMN) |
| Table 5.3.1-1 | Supported UE location information of non-3GPP access |
| Figure 6.1.1-1 | 5GC-MT-LR procedure for the regulatory location service |
| Figure 6.1.2-1 | 5GC-MT-LR Procedure for the commercial location services |
| Figure 6.1.3-1 | 5GC-MT-LR multiple location procedure for the regulatory location service |
| Figure 6.1.4-1 | 5GC-MT-LR procedure involving Mobile Base Station Relay |
| Figure 6.1.5-1 | 5GC-MT-LR procedure involving MWAB |
| Figure 6.2-1 | 5GC-MO-LR Procedure |
| Figure 6.3.1-1 | Deferred 5GC-MT-LR for periodic, triggered and UE available location events |
| Figure 6.3.2-1 | UE Cancellation of a Deferred 5GC-MT-LR for periodic or triggered location events |
| Figure 6.3.3-1 | Cancellation of a Deferred 5GC-MT-LR for periodic or triggered location events by an AF, an NF or External LCS Client |
| Figure 6.3.4-1 | UE Cancellation of a data collection |
| Figure 6.3.5.1-1 | Deferred 5GC-MT-LR for Periodic Events based on NRPPa Periodic Measurement |
| Figure 6.4-1 | Change of serving LMF for periodic and triggered UE location events |
| Figure 6.4.1-1 | Change of serving LMF for Periodic Events based on NRPPa Periodic Measurement |
| Figure 6.5.1-1 | Unified Location Service Exposure Procedure without routing by a UDM |
| Figure 6.5.2-1 | Unified Location Service Exposure Procedure with routing by a UDM |
| Figure 6.7.1-1 | Low Power Periodic and Triggered 5GC-MT-LR Procedure with no change of LMF |
| Figure 6.7.2-1 | Event Reporting with change of LMF |
| Figure 6.7.3-1 | Low Power Periodic and Triggered 5GC-MT-LR Procedure in RRC INACTIVE state with DL Positioning, RAT Independent Positioning or No Positioning |
| Figure 6.7.4-1 | Low Power Periodic and Triggered 5GC-MT-LR Procedure in RRC INACTIVE state with UL Positioning |
| Figure 6.7.5-1 | Low Power Periodic and Triggered 5GC-MT-LR Procedure in RRC INACTIVE state with UL+DL Positioning |
| Figure 6.8-1 | Bulk operation of LCS service request targeting to multiple UEs |
| Figure 6.9.1-1 | Common positioning procedures when UE is served by the one PLMN |
| Figure 6.9.2-1 | MT-LR positioning procedures when UE is served by the two VPLMNs |
| Figure 6.9.2-2 | MT-LR positioning procedures when UE is served by HPLMN and VPLMN |
| Figure 6.10.1-1 | 5GC Network Induced Location Request (5GC-NI-LR) for a UE |
| Figure 6.10.2-1 | 5GC-MT-LR Procedure without UDM Query |
| Figure 6.10.3-1 | Location Continuity for Handover of an Emergency session from NG-RAN |
| Figure 6.10.4-1 | 5GC-MT-LR Multiple Location Procedure without UDM Query |
| Figure 6.11.1-1 | UE Assisted and UE Based Positioning Procedure |
| Figure 6.11.2-1 | Network Assisted Positioning Procedure |
| Figure 6.11.3-1 | Procedure for Obtaining Non-UE Associated Network Assistance Data |
| Figure 6.11.4-1 | Positioning Procedure over User Plane |
| Figure 6.12.1-1 | UE Location Privacy Setting procedure initiated by UE |
| Figure 6.13.1-1 | MT-LR procedure with 5GC and EPC interaction |
| Figure 6.13.2-1 | MO-LR procedure with 5GC and EPC interaction |
| Figure 6.14.1-1 | Broadcasting Network Assistance Data |
| Figure 6.14.2-1 | Delivery of Ciphering Keys to UEs for Broadcast Assistance Data |
| Figure 6.15.1-1 | GNSS assistance data collection from untrusted AF |
| Figure 6.15.2-1 | GNSS assistance data collection from trusted AF |
| Figure 6.16.1-1 | Reporting of Location Events to an LCS Client or AF via user plane |
| Figure 6.17.1-1 | PRU Association Procedure |
| Figure 6.17.2-1 | LMF Initiated PRU Disassociation Procedure |
| Figure 6.17.3-1 | PRU Initiated PRU Disassociation Procedure |
| Figure 6.17.4-1 | Location of a target UE using PRUs |
| Figure 6.18.1-1 | Positioning via a User Plane Connection between UE and LMF initiated by LMF |
| Figure 6.18.2-1 | Positioning via a User Plane Connection between UE and LMF, initiated by UE |
| Figure 6.18.3-1 | Connection modification between UE and LMFs |
| Figure 6.19.1.1-1 | Location Service Continuity from 5GS to EPS with N26 Interface for Immediate Location Request |
| Figure 6.19.1.2-1 | Location Service Continuity from EPS to 5GS with N26 Interface for Immediate Location Request |
| Figure 6.19.1.3-1 | Location Service Continuity from 5GS to EPS without N26 Interface for Immediate Location Request |
| Figure 6.19.1.4-1 | Location Service Continuity from EPS to 5GS without N26 Interface for Immediate Location Request |
| Figure 6.19.2.1-1 | LCS Continuity Solution for 5GS to EPS Mobility |
| Figure 6.19.2.2-1 | LCS Continuity Solution for EPS to 5GS Mobility |
| Figure 6.20.1-1 | SL-MO-LR Procedure |
| Figure 6.20.3-1 | SL-MT-LR Procedure |
| Figure 6.20.4-1 | Periodic and Triggered SL-MT-LR Procedure |
| Figure 6.21-1 | Procedure for NWDAF assistance to location services |
| Figure 6.22.3-1 | Data collection by LMF to train the AI/ML based positioning model using NG-RAN measurements |
| Figure 6.22.4-1 | Procedure of input data collection from LMF |
| Figure 6.22.5-1 | Retrieval of trained ML model(s) for LMF-based AI/ML positioning from NWDAF |
| Figure 6.23.2-1 | Data Collection for NG RAN-sided models for UEs under positioning |
| Table 7.1-1 | LCS privacy profile data stored in the UDM for a UE Subscriber |
| Table 7.1-2 | LCS Mobile Originated data for a UE Subscriber |
| Table 7.1-3 | LCS broadcasting data for a UE subscriber |
| Table 7.1-4 | UE LCS subscriber data |
| Table 7.2.1-1 | GMLC Information for an External LCS Client |
| Table 8.3.1-1 | List of LMF Services |
| Table 8.4.1-1 | List of GMLC Services |
| Table A.1-1 | Differences in Parameters for a Location Request with TS 23.271 [4] |
| Table A.2-1 | Differences in Information Storage for a UE in the UDR/UDM versus HSS/GMLC for EPS |
| Table A.3-1 | Differences in Information Storage for an LCS Client in the GMLC |
| Table A.4.1-1 | Differences in UE LCS Privacy with TS 23.271 [4] |
| Figure B.1-1 | Privacy selection flow diagram |
| Figure C-1 | PNI-NPN architecture to support location service with signalling optimisation |