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back to TS 23.273

Table of Contents for  TS 23.273  Word version:  19.5.0

1Scope  p. 10
2References  p. 10
3Definitions and Abbreviations  p. 12
3.1Definitions  p. 12
3.2Abbreviations  p. 13
4Architecture Model and Concepts  p. 14
4.1General Concepts  p. 14
4.1aTypes of Location Request  p. 15
4.1a.1Network Induced Location Request (NI-LR)  p. 15
4.1a.2Mobile Terminated Location Request (MT-LR)  p. 15
4.1a.3Mobile Originated Location Request (MO-LR)  p. 15
4.1a.4Immediate Location Request  p. 15
4.1a.5Deferred Location Request  p. 15
4.1a.5.1Types of event  p. 15
4.1bLCS Quality of Service  p. 16
4.1cScheduled Location Time |R17|  p. 17
4.2Architectural Reference Model  p. 17
4.2.1Non-roaming reference architecture  p. 17
4.2.2Roaming reference architecture  p. 19
4.2.3Reference architecture with sidelink positioning |R18|  p. 20
4.2aInterconnection between 5GC and EPC  p. 20
4.2a.1General  p. 20
4.2a.2Non-roaming architecture  p. 20
4.2a.3Roaming architecture  p. 21
4.2bPositioning methods  p. 23
4.3Functional description of LCS per network function  p. 23
4.3.1Access Network  p. 23
4.3.2LCS Clients, Application Functions and Network Functions  p. 24
4.3.3Gateway Mobile Location Centre, GMLC  p. 24
4.3.4Location Retrieval Function, LRF  p. 25
4.3.5UE  p. 25
4.3.6UDM  p. 26
4.3.7Access and Mobility Management Function, AMF  p. 26
4.3.8Location Management Function, LMF  p. 27
4.3.9Network Exposure Function, NEF  p. 30
4.3.10Unified Data Repository, UDR  p. 30
4.3.11Positioning Reference Unit, PRU |R18|  p. 30
4.3.12Network Repository Function, NRF |R18|  p. 31
4.3.13Network Data Analytics Function, NWDAF |R19|  p. 31
4.4Reference Point to Support Location Services  p. 31
4.4.1Le Reference Point  p. 31
4.4.2NL3 Reference Point  p. 31
4.4.3N1 Reference Point  p. 31
4.4.4N2 Reference Point  p. 32
4.4.5Void  p. …
4.4.6NL5 Reference Point  p. 32
4.4.7NL2 Reference Point  p. 32
4.4.8NL6 Reference Point  p. 32
4.4.9N51 Reference Point  p. 32
4.4.10NL1 Reference Point  p. 32
4.4.11N52 Reference Point  p. 32
4.4.12NL7 Reference Point  p. 32
4.4.13NL8 Reference Point |R18|  p. 32
4.4.14NL9 Reference Point |R18|  p. 33
4.4.15NL10 Reference Point |R18|  p. 33
4.4.16NL11 Reference Point |R18|  p. 33
4.5Service Based Interfaces to Support Location Services  p. 33
5High Level Features  p. 33
5.1LMF Discovery and Selection  p. 33
5.1aGMLC Discovery and Selection  p. 35
5.23GPP access specific aspects  p. 35
5.3Non-3GPP Access Specific Aspects  p. 35
5.3.1Location Information for Non-3GPP Access  p. 35
5.3.2Access Type Selection for LCS Service  p. 36
5.4UE LCS privacy  p. 37
5.4.1General  p. 37
5.4.2Content of UE LCS Privacy Profile  p. 37
5.4.2.1General  p. 37
5.4.2.2Privacy Classes  p. 38
5.4.2.2.1Universal Class  p. 38
5.4.2.2.2Call/Session related Class  p. 38
5.4.2.2.3Call/Session unrelated Class  p. 38
5.4.2.2.4PLMN Operator Class  p. 38
5.4.2.3Location Privacy Indication (LPI)  p. 39
5.4.3Provision of UE LCS privacy profile  p. 39
5.4.4Privacy Override Indicator (POI)  p. 39
5.4.5LCS service authorization for an Immediate UE Location  p. 39
5.4.6LCS service authorization for a Deferred UE Location  p. 40
5.5Location service exposure  p. 41
5.6LCS Charging  p. 43
5.7Support of Concurrent Location Requests  p. 43
5.7.1General  p. 43
5.7.2Combining location requests by an H-GMLC or NEF  p. 44
5.7.3Combining location requests by a V-GMLC  p. 44
5.7.4Combining location requests by an AMF  p. 44
5.7.5Combining location requests by an LMF  p. 44
5.7.6Combining location requests by a UE  p. 44
5.8Interworking with the IMS  p. 45
5.9Location Service involving Mobile Base Station Relay |R18|  p. 45
5.9.1General  p. 45
5.9.2Obtaining location information for the MBSR  p. 45
5.9.3Privacy check for MBSR  p. 45
5.10Support of Positioning over user plane connection between UE and LMF for non-regulatory service |R18|  p. 46
5.11Collection of GNSS assistance data |R18|  p. 46
5.12UE Unaware Positioning |R18|  p. 47
5.13Support of location service in PNI-NPN with signalling optimisation |R18|  p. 47
5.14Event Report Allowed Area |R18|  p. 48
5.15Support of Low Power and High Accuracy Positioning |R18|  p. 48
5.16Location services assisted by NWDAF |R18|  p. 48
5.16ANetwork data analytics assisted by LCS |R18|  p. 49
5.16BLCS Continuity During UE Mobility |R18|  p. 49
5.16B.1Mobility Between 5GS and EPS  p. 49
5.17Support of Ranging and Sidelink Positioning |R18|  p. 49
5.18Support for UE positioning based on a ML Model at the LMF |R19|  p. 49
5.18.0General  p. 49
5.18.1Void  p. …
5.18.2AI/ML model performance monitoring for LMF-based AI/ML Positioning  p. 51
5.19Location Service involving Mobile Wireless Access Backhaul |R19|  p. 51
5.19.1General  p. 51
5.19.2Obtaining location information for the MWAB  p. 52
5.19.3Privacy check for MWAB  p. 52
6Location Service Procedures  p. 52
6.15GC-MT-LR Procedure  p. 52
6.1.15GC-MT-LR procedure for the regulatory location service  p. 52
6.1.25GC-MT-LR Procedure for the commercial location service  p. 54
6.1.35GC-MT-LR multiple location procedure for the regulatory location service |R18|  p. 59
6.1.45GC-MT-LR procedure involving Mobile Base Station Relay |R18|  p. 61
6.1.55GC-MT-LR procedure involving MWAB |R19|  p. 63
6.25GC-MO-LR Procedure  p. 66
6.3Deferred 5GC-MT-LR Procedure for Periodic, Triggered and UE Available Location Events  p. 69
6.3.1Initiation and Reporting of Location Events  p. 69
6.3.2Cancellation of Reporting of Location Events by a UE  p. 76
6.3.3Cancellation of Reporting of Location Events by an AF, an NF or External LCS Client or GMLC  p. 77
6.3.4Cancellation of Reporting of data collection by a UE |R19|  p. 78
6.3.5Deferred 5GC-MT-LR Procedure for Periodic Location Events based on NRPPa Periodic Measurement |R19|  p. 79
6.3.5.1Initiation and Reporting of Periodic Events based on NRPPa Periodic Measurement  p. 79
6.3.5.2Cancellation of Reporting of Periodic Events by an AF, an NF or External LCS Client or GMLC  p. 80
6.4LMF Change Procedure  p. 80
6.4.0General |R19|  p. 80
6.4.1LMF Change Procedure for NRPPa Periodic Measurement |R19|  p. 82
6.5Unified Location Service Exposure Procedure  p. 83
6.5.1Unified Location Service Exposure Procedure without routing by a UDM  p. 83
6.5.2Unified Location Service Exposure Procedure with routing via a UDM  p. 86
6.6NG-RAN Location Service Exposure Procedure  p. 87
6.7Low Power Periodic and Triggered 5GC-MT-LR Procedures  p. 87
6.7.1Event Reporting with no change of LMF  p. 88
6.7.2Event Reporting with change of LMF  p. 90
6.7.3Event Reporting in RRC INACTIVE state for DL Positioning, RAT Independent Positioning or No Positioning |R17|  p. 90
6.7.4Event Reporting in RRC INACTIVE state for UL Positioning |R17|  p. 92
6.7.5Event Reporting in RRC INACTIVE state for UL+DL Positioning |R17|  p. 95
6.8Bulk Operation of LCS Service Request Targeting to Multiple UEs  p. 98
6.9Procedures to Support Non-3GPP Access  p. 100
6.9.1Common Positioning Procedures when a UE is served by only one PLMN  p. 100
6.9.2MT-LR Procedures when a UE is served by Different PLMNs for 3GPP Access and Non-3GPP Access  p. 102
6.9.3MO-LR Procedures when UE is served by the Different PLMNs via 3GPP Access and Non-3GPP Access  p. 105
6.9.4NI-LR Procedures when a UE is served by Different PLMNs for 3GPP access and non-3GPP access  p. 105
6.10Procedures dedicated to Support Regulatory services  p. 105
6.10.15GC-NI-LR Procedure  p. 105
6.10.25GC-MT-LR Procedure without UDM Query  p. 107
6.10.3Location continuity for Handover of an Emergency session from NG-RAN  p. 108
6.10.45GC-MT-LR multiple location procedure without UDM Query |R18|  p. 110
6.10.5Multiple location procedure for multiple emergency LCS clients |R19|  p. 111
6.11Common Sub-Procedures  p. 111
6.11.0General |R18|  p. 111
6.11.1UE Assisted and UE Based Positioning Procedure  p. 111
6.11.2Network Assisted Positioning Procedure  p. 113
6.11.3Obtaining Non-UE Associated Network Assistance Data  p. 114
6.11.4Positioning Procedure over User Plane |R18|  p. 114
6.12UE Location Privacy Setting Procedure  p. 115
6.12.1UE Location Privacy Setting Procedure Initiated by UE  p. 115
6.12.2UE Location Privacy Setting Procedure Initiated by AF  p. 116
6.13Procedures with interaction between 5GC and EPC  p. 116
6.13.1MT-LR Procedure  p. 116
6.13.2MO-LR Transfer to a Third Party Procedure  p. 118
6.14Procedures for Broadcast of Assistance Data  p. 119
6.14.1Broadcast of Assistance Data by an LMF  p. 119
6.14.2Delivery of Ciphering Keys to UEs for Broadcast Assistance Data  p. 121
6.15Procedures for GNSS assistance data Collection |R18|  p. 122
6.15.1GNSS assistance data collection from untrusted AF via NEF  p. 122
6.15.2GNSS assistance data collection from trusted AF  p. 123
6.16Periodic and Triggered 5GC-MT-LR Procedure with User Plane |R18|  p. 124
6.16.1Reporting of Location Events to an LCS Client or AF via user plane  p. 124
6.16.2Cancellation of Reporting of Location Events with a User Plane Connection  p. 126
6.17Procedures applicable to a PRU |R18|  p. 127
6.17.1PRU Association Procedure  p. 127
6.17.2LMF Initiated PRU Disassociation Procedure  p. 129
6.17.3PRU Initiated PRU Disassociation Procedure  p. 130
6.17.4Positioning of a target UE  p. 131
6.18Procedures of User Plane Connection between UE and LMF |R18|  p. 133
6.18.0General  p. 133
6.18.1LMF initiated User Plane Connection  p. 134
6.18.2UE initiated User Plane Connection  p. 135
6.18.3Modification of User Plane Connection between UE and LMF  p. 137
6.19Location Service Continuity between EPS and 5GS |R18|  p. 139
6.19.0General  p. 139
6.19.1Location Service Continuity for Immediate Location Request  p. 139
6.19.1.1Location Service Continuity from 5GS to EPS with N26 Interface for Immediate Location Request  p. 139
6.19.1.2Location Service Continuity from EPS to 5GS with N26 Interface for Immediate Location Request  p. 141
6.19.1.3Location Service Continuity from 5GS to EPS without N26 Interface for Immediate Location Request  p. 142
6.19.1.4Location Service Continuity from EPS to 5GS without N26 Interface for Immediate Location Request  p. 143
6.19.2Location Service Continuity between EPS and 5GS (bi-direction) for deferred MT-LR  p. 143
6.19.2.1Location Service Continuity from 5GS to EPS  p. 144
6.19.2.2Location Service Continuity from EPS to 5GS  p. 145
6.20Ranging/Sidelink Positioning procedures |R18|  p. 146
6.20.1Procedures of SL-MO-LR involving LMF  p. 146
6.20.25GC-MO-LR Procedure using Ranging/SL positioning  p. 150
6.20.3Procedures of SL-MT-LR involving LMF  p. 151
6.20.4Procedures of SL-MT-LR for periodic, triggered Location Events  p. 154
6.20.55GC-MT-LR Procedure using Ranging/SL positioning  p. 157
6.21Procedure for NWDAF assistance to location services |R18|  p. 158
6.21.0General  p. 158
6.21.1Location Accuracy Analytics Retrieval by LMF  p. 159
6.21.2UE Mobility Analytics Retrieval by AMF  p. 159
6.22Procedures of data collection for LMF-based AI/ML Positioning |R19|  p. 159
6.22.1General  p. 159
6.22.2Void  p. …
6.22.3Data collection to train models for LMF-based AI/ML positioning based on NG RAN measurements  p. 159
6.22.4Input data collection by NWDAF for AI/ML positioning ML model training or ML model performance monitoring  p. 161
6.22.5LMF retrieval of a trained AI/ML Model for positioning  p. 163
6.23Procedures of data collection for NG RAN-sided models for AI/ML positioning |R19|  p. 164
6.23.1General  p. 164
6.23.2Data Collection for NG RAN-sided models for UEs under positioning  p. 164
7Information storage  p. 165
7.1UDM  p. 165
7.2GMLC  p. 168
7.2.1Information for an LCS Client  p. 168
8Network Function Services  p. 170
8.1AMF Services  p. 170
8.2UDM Services  p. 170
8.3LMF Services  p. 170
8.3.1General  p. 170
8.3.2Nlmf_Location service  p. 170
8.3.2.1General  p. 170
8.3.2.2Nlmf_Location_DetermineLocation service operation  p. 171
8.3.2.3Nlmf_Location_EventNotify service operation  p. 171
8.3.2.4Nlmf_Location_CancelLocation service operation  p. 172
8.3.2.5Nlmf_Location_LocationContextTransfer service operation  p. 172
8.3.2.6Nlmf_Location_MeasurementData service operation |R18|  p. 172
8.3.2.7Nlmf_Location_UPConfig service operation |R18|  p. 173
8.3.2.8Nlmf_Location_UPSubscribe service operation |R18|  p. 173
8.3.2.9Nlmf_Location_UPNotify service operation |R18|  p. 173
8.3.2.10Nlmf_Location_UPUnSubscribe service operation |R18|  p. 173
8.3.3Nlmf_Broadcast service  p. 174
8.3.3.1General  p. 174
8.3.3.2Nlmf_Broadcast_CipheringKeyData service operation  p. 174
8.3.4Nlmf_DataExposure service |R19|  p. 174
8.3.4.1General  p. 174
8.3.4.2Nlmf_DataExposure_Subscribe service operation  p. 174
8.3.4.3Nlmf_DataExposure_Notify service operation  p. 175
8.3.4.4Nlmf_DataExposure_UnSubscribe service operation  p. 175
8.4GMLC Services  p. 175
8.4.1General  p. 175
8.4.2Ngmlc_Location service  p. 176
8.4.2.1General  p. 176
8.4.2.2Ngmlc_Location_ProvideLocation service operation  p. 176
8.4.2.3Ngmlc_Location_LocationUpdate service operation  p. 177
8.4.2.4Ngmlc_Location_EventNotify service operation  p. 177
8.4.2.5Ngmlc_Location_CancelLocation service operation  p. 177
8.4.2.6Ngmlc_Location_LocationUpdateNotify service operation  p. 178
8.4.2.7Ngmlc_Location_PrivacyCheck_IDMapping service operation |R18|  p. 178
8.4.2.8Void  p. …
8.5NEF Services  p. 178
8.6UDR Services  p. 178
ADifferences with TS 23.271 [4]  p. 179
A.0General  p. 179
A.1Differences in Parameters for a Location Request  p. 179
A.2Differences in Information Storage in the UDR/UDM versus HSS/GMLC for EPS  p. 179
A.3Differences in Information Storage in the GMLC  p. 180
A.4Differences with TS 23.271 [4] on Privacy  p. 181
A.4.1Differences in UE LCS Privacy  p. 181
BLCS privacy selection rule in serving NF  p. 183
B.1LCS privacy selection flow rule  p. 183
CPNI-NPN architecture to support location service with signalling optimisation |R18|  p. 184
$Change history  p. 185