Content for TR 23.731 Word version: 16.0.0
5 Key Issues
6 Solutions
7 Evaluation
8 Conclusions
A Supported positioning methods
B Evaluation tables for Key Issues
$ Change History
5 Key Issues p. 13
5.1 Key Issue 1: Enhancement to LCS Architecture p. 13
5.1.1 Description p. 13
5.2 Key Issue 2: Positioning via user plane transmission p. 14
5.2.1 Description p. 14
5.3 Key Issue 3: Support of low latency and high performance LCS p. 14
5.3.1 Description p. 14
5.4 Key Issue 4: Reduce overhead for repetitive non-successful privacy verification p. 15
5.4.1 Description p. 15
5.5 Key Issue 5: Slicing dependent location service p. 15
5.5.1 Description p. 15
5.6 Key Issue 6: Scalability p. 16
5.6.1 Description p. 16
5.7 Key Issue 7: Location service exposure p. 16
5.7.1 Description p. 16
5.8 Key Issue 8: Support of IoT UEs p. 17
5.8.1 Description p. 17
5.9 Key Issue 9: Support EUTRAN positioning methods p. 17
5.9.1 Description p. 17
5.10 Key Issue 10: Support NR positioning methods p. 17
5.10.1 Description p. 17
5.11 Key Issue 11: Coordination of Positioning Signalling Transmitted via Control Plane Path and User Plane Path p. 17
5.11.1 Description p. 17
5.12 Key Issue 12: LCS support for Non-3GPP access p. 18
5.12.1 Description p. 18
5.13 Key Issue 13: Support of Flexible and Efficient Periodic and Triggered Location p. 18
5.13.1 Description p. 18
5.14 Key Issue 14: Positioning Access selection for LCS service p. 18
5.14.1 Description p. 18
5.15 Key Issue 15: Location continuity support p. 19
5.15.1 Description p. 19
5.16 Key Issue 16: Distribution Positioning Assistance Data p. 19
5.16.1 Description p. 19
6 Solutions p. 20
6.1 Solution 1: 5GS LCS Functionality and Allocation to 5GS elements - Option 1 and Option 2 p. 20
6.1.1 Introduction p. 20
6.1.2 Functional Description p. 21
6.1.2.1 Common Functionality p. 21
6.1.2.2 Option A: EPS like allocation p. 21
6.1.2.3 Option B: LMF centric allocation p. 23
6.1.3 Procedures p. 25
6.1.4 Impacts on existing entities and interfaces p. 25
6.1.5 Evaluation p. 25
6.2 Solution 2: LMF Based Location Solution p. 25
6.2.1 Introduction p. 25
6.2.2 Functional Description p. 26
6.2.3 Procedures p. 28
6.2.3.1 5GC-MT-LR Procedure p. 28
6.2.3.2 5GC-MO-LR Procedure p. 31
6.2.3.3 Periodic and Triggered 5GC-MT-LR Procedure p. 33
6.2.3.4 Optimized Periodic and Triggered 5GC-MT-LR Procedure p. 36
6.2.3.5 Low Power Periodic and Triggered 5GC-MT-LR Procedure p. 38
6.2.4 Compatibility with the Location Solution for regulatory services in Release 15 p. 41
6.2.4.1 Architectural Compatibility p. 41
6.2.4.2 Compatibility on the N1 Reference Point p. 42
6.2.4.3 Compatibility on the N2 Reference Point p. 42
6.2.4.4 Compatibility on the NLs Reference Point p. 42
6.2.4.5 Compatibility on the NLg and NLg* Reference Points p. 43
6.2.4.6 Compatibility on the NLh Reference Point p. 44
6.2.5 Impacts on existing entities and interfaces p. 44
6.2.5.1 Impacts to UDM and Nudm SBI p. 44
6.2.5.2 Impacts to GMLC and Ngmlc SBI p. 45
6.2.5.3 Impacts to LMF and Nlmf SBI p. 46
6.2.5.4 Impacts to UE p. 49
6.2.5.5 Impacts to AMF and Namf SBI p. 51
6.2.5.6 Impacts to the NG-RAN p. 51
6.2.6 Evaluation p. 52
6.3 Solution 3: Enhancement to LCS architecture p. 52
6.3.1 Description p. 52
6.3.2 Reference LCS architecture p. 52
6.3.2a Functional Description p. 53
6.3.4 Impacts on existing entities and interfaces p. 54
6.3.5 Evaluation p. 54
6.4 Solution 4: Positioning operations considering different LMF deployment scenarios p. 54
6.4.1 Introduction p. 54
6.4.2 Functional Description p. 54
6.4.2.1 Common Functionality p. 54
6.4.2.2 Solution 4A: AMF based selection solution with positioning signalling via AMF p. 55
6.4.2.3 Solution 4B: LMF centric based selection solution p. 55
6.4.3 Procedures p. 55
6.4.3.1 Procedures for the Solution 4A p. 55
6.4.3.1.1 5GC-MO-LR Procedure for the Solution 4A p. 55
6.4.3.1.2 5GC-MT-LR Procedure for the Solution 4A p. 57
6.4.3.2 Procedures for the Solution 4B p. 58
6.4.4 Impacts on existing entities and interfaces p. 60
6.4.5 Evaluation p. 60
6.5 Solution 5: Privacy Check with UE privacy setting p. 60
6.5.1 Introduction p. 60
6.5.2 Functional Description p. 60
6.5.3 Procedures p. 61
6.5.3.1 5GC-MT-LR with privacy check p. 61
6.5.3.2 Privacy Setting Update p. 63
6.5.3.3 5GC-MT-LR with privacy check based on LMF based architecture p. 64
6.5.4 Impacts on existing entities and interfaces p. 65
6.5.5 Evaluation p. 65
6.6 Solution 6: User Privacy Setting send via AMF p. 65
6.6.1 Introduction p. 65
6.6.2 Functional Description p. 65
6.6.3 Procedures p. 65
6.6.3.1 Privacy Setting Update p. 65
6.6.3.2 Privacy Verification p. 66
6.6.3.3 GMLC service p. 66
6.6.3.4 PPR service p. 67
6.6.4 Impacts on existing entities and interfaces p. 67
6.6.5 Evaluation p. 68
6.7 Solution 7: User Privacy Setting send via LMF p. 68
6.7.1 Introduction p. 68
6.7.2 Functional Description p. 68
6.7.3 Procedures p. 68
6.7.3.1 Privacy Setting Update p. 68
6.7.3.2 Privacy Verification p. 70
6.7.3.3 Service of GMLC and PPR p. 70
6.7.4 Impacts on existing entities and interfaces p. 70
6.7.5 Evaluation p. 70
6.8 Solution 8: slice dependent LMF selection p. 70
6.8.1 Introduction p. 70
6.8.2 Functional Description p. 70
6.8.3 Procedures p. 70
6.8.4 Impacts on existing entities and interfaces p. 71
6.8.5 Evaluation p. 72
6.9 Solution 9: Solution for position service exposure p. 72
6.9.1 Introduction p. 72
6.9.2 Functional Description p. 72
6.9.2.1 Architecture p. 72
6.9.3 Procedures p. 73
6.9.3.1 Location Service exposure procedure, non-roaming p. 73
6.9.3.2 Location Service exposure procedure, roaming p. 74
6.9.3.3 Optimized Deferred Location Service exposure procedure p. 76
6.9.4 Impacts on existing entities and interfaces p. 77
6.9.5 Evaluation p. 77
6.10 Solution 10: Solution for LDR type service exposure via NEF p. 78
6.10.1 Introduction p. 78
6.10.2 Functional Description p. 78
6.10.2.1 Architecture p. 78
6.10.3 Procedures p. 79
6.10.3.1 LDR type service exposure procedure p. 79
6.10.3.2 Application request to update LDR type service p. 81
6.10.3.3 Application request to cancel LDR type service p. 82
6.10.3.4 UE provides the expected location privacy provisioning to the network p. 83
6.10.4 Impacts on existing entities and interfaces p. 83
6.10.5 Evaluation p. 84
6.11 Solution 11: Solution for Location Service exposure to NG-RAN p. 84
6.11.1 Introduction p. 84
6.11.2 Functional Description p. 84
6.11.3 Procedures p. 84
6.11.4 Impacts on existing entities and interfaces p. 85
6.11.5 Evaluation p. 85
6.12 Solution 12: LCS support for non-3GPP access p. 85
6.12.1 Introduction p. 85
6.12.2 Functional Description p. 86
6.12.3 Procedures p. 87
6.12.4 Impacts on existing entities and interfaces p. 89
6.12.4.1 Impacts to UDM p. 89
6.12.4.2 Impacts to GMLC p. 89
6.12.4.3 Impacts to LMF p. 89
6.12.4.4 Impacts to AMF p. 89
6.12.4.5 Impacts to N3IWF p. 89
6.12.4.6 Impacts to UE p. 89
6.12.5 Evaluation p. 89
6.13 Solution 13: LCS support for non-3GPP access p. 89
6.13.1 Introduction p. 89
6.13.2 Functional Description p. 89
6.13.3 Positioning Procedures p. 91
6.13.3.1 Common Positioning Procedures When UE is served by the Same PLMN p. 91
6.13.3.2 MT-LR Procedures When UE is served by the Different PLMNs via 3GPP access and Non-3GPP access p. 93
6.13.3.3 MO-LR Procedures When UE is served by the Different PLMNs via 3GPP access and Non-3GPP access p. 96
6.13.3.4 NI-LR Procedures When UE is served by the Different PLMNs via 3GPP access and Non-3GPP access p. 96
6.13.4 Impact on existing entities and interfaces p. 96
6.13.5 Evaluation p. 96
6.14 Solution 14: Reuse R15 existing location service architecture for commercial use cases p. 97
6.14.1 Introduction p. 97
6.14.2 Functional Description p. 97
6.14.2.1 Architecture to support Location Services p. 97
6.14.2.2 Reference point to support Location Services p. 99
6.14.2.3 Service Based Interfaces to support Location Services p. 100
6.14.2.4 Network Functions to support Location Services p. 100
6.14.3 Procedures p. 101
6.14.3.0 LMF selection p. 101
6.14.3.1 5GC-MT-LR Procedure p. 101
6.14.3.2 5GC-MO-LR Procedure p. 103
6.14.3.3 Deferred 5GC-MT-LR Procedure for Periodic, Triggered and UE Available Location Events p. 104
6.14.3.4 LMF change procedure via serving LMF p. 110
6.14.4 Impacts on existing entities and interfaces p. 111
6.14.4.1 Impacts to UDR and UDM p. 111
6.14.4.2 Impacts to GMLC p. 111
6.14.4.3 Impacts to UE p. 111
6.14.4.4 Impacts to AMF p. 112
6.14.4.5 Impacts to LMF p. 112
6.14.5 Evaluation p. 112
6.15 Solution 15: Enhancement to LCS architecture p. 112
6.15.1 Introduction p. 112
6.15.2 Functional Description p. 112
6.15.3 Procedures p. 114
6.15.4 Impacts on existing entities and interfaces p. 116
6.15.5 Evaluation p. 116
6.16 Solution 16: Solution for position via user plane transmission p. 117
6.16.1 Introduction p. 117
6.16.2 Functional Description p. 117
6.16.3 Procedures p. 117
6.16.3.1 UE establishes the connection with UCF p. 117
6.16.3.2 UE initiated position via user plane p. 118
6.16.3.3 Network initiated position via user plane p. 118
6.16.4 Impacts on existing entities and interfaces p. 119
6.16.5 Evaluation p. 119
6.17 Solution 17: Solution for Flexible and Efficient Periodic and Triggered Location p. 119
6.17.1 Introduction p. 119
6.17.2 Functional Description p. 120
6.17.3 Procedures p. 120
6.17.3.1 Generic Procedure p. 120
6.17.4 Impacts on existing entities and interfaces p. 122
6.17.5 Evaluation p. 122
6.18 Solution #18: UDM based Positioning Access selection for LCS service p. 122
6.18.1 Introduction p. 122
6.18.2 Functional Description p. 122
6.18.3 Procedures p. 123
6.18.4 Impacts on existing entities and interfaces p. 124
6.18.5 Evaluation p. 124
6.19 Solution #19: Distribution of Positioning Assistance Information p. 124
6.19.1 Introduction p. 124
6.19.2 Functional Description p. 124
6.19.3 Procedures p. 125
6.19.3.1 UE Assisted and UE Based Positioning and Assistance Delivery Procedure p. 125
6.19.3.2 Obtaining Non-UE Associated Network Assistance Data p. 126
6.19.3.3 Broadcasting assistance data for UE assisted or UE based positioning p. 127
6.19.4 Impacts on existing entities and interfaces p. 128
6.19.5 Evaluation p. 128
6.20 Solution 20: LMF selection in GMLC p. 128
6.20.1 Introduction p. 128
6.20.2 Functional Description p. 128
6.20.3 Procedures p. 128
6.20.3.1 Procedure for LMF selection in GMLC with MO-LR and NI-LR p. 128
6.20.3.2 Procedure for LMF selection in GMLC with 5GC-MT-LR p. 129
6.20.4 Impacts on existing entities and interfaces p. 131
6.20.5 Evaluation p. 131
6.21 Solution 21: Solution for Low Power Periodic and Triggered Location p. 132
6.21.1 Introduction p. 132
6.21.2 Functional Description p. 132
6.21.3 Procedures p. 132
6.21.4 Impacts on existing entities and interfaces p. 135
6.21.4.1 Impacts to LMF and Nlmf SBI p. 135
6.21.4.2 Impacts to UE p. 135
6.21.4.3 Impacts to AMF and Namf SBI p. 135
6.21.4.4 Impacts to the NG-RAN p. 135
6.22 Solution 22: LCS continuity Support for N26 based Handover p. 136
6.22.1 Introduction p. 136
6.22.2 Functional Description p. 136
6.22.3 Procedures p. 136
6.22.3.1 LCS support during Handover from 5GS to EPS p. 136
6.22.3.2 LCS support during Handover from EPS to 5GS p. 138
6.22.4 Impacts on existing entities and interfaces p. 140
6.22.5 Evaluation p. 140
6.23 Solution #23: Unified NEF Location Service Exposure p. 140
6.23.1 Introduction p. 140
6.23.2 Functional Description p. 141
6.23.3 Procedures p. 141
6.23.3.1 Unified Location Service Exposure Procedure p. 141
6.23.3.2 Alternative procedure for NEF to use AMF event exposure service via the UDM p. 144
6.23.3.3 Enhanced NG-RAN Location Reporting Procedure p. 145
6.23.4 Impacts on existing entities and interfaces p. 146
6.23.5 Evaluation p. 146
6.24 Solution #24: GMLC based Positioning Access selection for LCS service p. 146
6.24.1 Introduction p. 146
6.24.2 Functional Description p. 146
6.24.3 Procedures p. 147
6.24.4 Impacts on existing entities and interfaces p. 148
6.24.5 Evaluation p. 148
6.25 Solution #25: Coordination of Positioning Signalling Transmitted via Control Plane Path and User Plane Path p. 148
6.25.1 Introduction p. 148
6.25.2 Functional Description p. 148
6.25.3 Procedures p. 148
6.25.4 Impacts on existing entities and interfaces p. 149
6.25.5 Evaluation p. 149
6.26 Solution 26: Local LCS architecture p. 149
6.26.1 Introduction p. 149
6.26.2 Functional Description p. 150
6.26.3 Procedures p. 150
6.26.4 Impacts on existing entities and interfaces p. 152
6.26.5 Evaluation p. 152
6.27 Solution #27: Bulk operation of LCS service request targeting to multiple UEs p. 153
6.27.1 Introduction p. 153
6.27.2 Functional Description p. 153
6.27.2.1 Option 1: LCS service request stored in the UDR as the subscription data p. 153
6.27.2.2 Option 2: LCS service request stored in the UDR as the application data p. 153
6.27.3 Procedures p. 153
6.27.3.1 Option 1: LCS service request stored in the UDR as the subscription data p. 154
6.27.3.2 Option 2: LCS service request stored in the UDR as the application data p. 155
6.27.4 Impacts on existing entities and interfaces p. 156
6.27.4.1 Impacts to UDR and UDM p. 156
6.27.4.2 Impacts to GMLC p. 156
6.27.4.3 Impacts to NEF p. 156
6.27.5 Evaluation p. 156
6.28 Solution #28: Enhanced NG-RAN to support high accuracy location estimation p. 156
6.28.1 Introduction p. 156
6.28.2 Functional Description p. 157
6.28.3 Procedures p. 157
6.28.3.1 5GC-MT-LR Procedure p. 157
6.28.3.2 MO-LR Procedure p. 157
6.28.3.3 5GC- Deferred 5GC-MT-LR Procedure for Periodic, Triggered and UE Available Location Events p. 157
6.28.3.4 Location Service Exposure Procedure p. 158
6.28.4 Impacts on existing entities and interfaces p. 158
6.28.5 Evaluation p. 158
7 Evaluation p. 158
7.1 Evaluation of Solutions for Key Issue #4 p. 159
7.2 Evaluation of Complete E2E Solutions for Key Issue 1 p. 159
7.3 Evaluation of Architectural Solutions p. 159
7.4 Evaluation of Solutions for Location Service Exposure p. 159
7.5 Evaluation of Solutions for Non-3GPP Access p. 160
7.6 Evaluation of Solutions for Miscellaneous Functional Enhancements p. 160
7.7 Evaluation of Solutions for Key Issue #9 and #10 p. 161
7.8 Evaluation of Solutions for Key Issue #3 p. 161
8 Conclusions p. 161
8.0 General conclusions p. 161
8.1 Conclusions of key issue 1 p. 161
8.2 Conclusion for Key Issue #4 p. 162
8.3 Conclusion for Key Issue #12 p. 162
8.4 Conclusion for Key Issues #6 and #8 p. 162
8.5 Conclusion for Key Issue #7 p. 162
8.6 Conclusion for Key Issue #9 and #10 p. 162
8.7 Agreement for Key Issue #14 p. 162
8.8 Conclusions for Key Issue #3 p. 163
8.9 Conclusion for Key Issues 5 p. 163
8.10 Conclusions for other Key Issues p. 163
A Supported positioning methods p. 164
A.1 Supported positioning methods in EUTRAN Rel-15 p. 164
A.2 Supported positioning methods in NR Rel-15 p. 165
B Evaluation tables for Key Issues p. 167
B.1 Evaluation table for of Solutions for Key Issue #4 p. 167
B.2 Evaluation table for of Solutions for Key Issue #7 p. 168
B.3 Evaluation table for Key Issue #3 p. 169
$ Change History p. 170
