Content for TR 23.700-08 Word version: 18.0.0
6 Solutions p. 18
6.0 Mapping Solutions to Key Issues p. 19
6.1 Solution #1: Enable efficient mobility via equivalent SNPNs p. 19
6.1.1 Introduction p. 19
6.1.2 Functional Description p. 20
6.1.3 Procedures p. 20
6.1.4 Impacts on services, entities, and interfaces p. 22
6.2 Solution #2: Access to SNPN services via Untrusted non-3GPP access network p. 23
6.2.1 Introduction p. 23
6.2.2 Functional Description p. 23
6.2.3 Procedures p. 23
6.2.4 Impacts on services, entities, and interfaces p. 24
6.3 Solution #3: Access to SNPN services via Trusted non-3GPP access network p. 24
6.3.1 Introduction p. 24
6.3.2 Functional Description p. 24
6.3.3 Procedures p. 25
6.3.4 Impacts on services, entities, and interfaces p. 26
6.4 Solution #4: Support of onboarding over untrusted non-3GPP access in SNPN p. 26
6.4.1 Introduction p. 26
6.4.2 Functional Description p. 27
6.4.3 Procedures p. 27
6.4.4 Impacts on services, entities, and interfaces p. 27
6.5 Solution #5: Support of Credentials Holder scenarios over untrusted non-3GPP access in SNPN p. 28
6.5.1 Introduction p. 28
6.5.2 Functional Description p. 28
6.5.3 Procedures p. 28
6.5.4 Impacts on services, entities, and interfaces p. 28
6.6 Solution #6: Access to SNPN services via wireline access network p. 29
6.6.1 Introduction p. 29
6.6.2 Functional Description p. 29
6.6.3 Impacts on services, entities, and interfaces p. 29
6.7 Solution #7: High level flow for localized service support p. 29
6.7.1 Introduction p. 29
6.7.2 Functional Description p. 30
6.7.3 Procedures p. 30
6.7.4 Impacts on services, entities, and interfaces p. 32
6.8 Solution #8: Reuse existing mechanisms for Control Plane Load Control, Congestion and Overload Control p. 32
6.8.1 Introduction p. 32
6.8.2 Functional Description p. 32
6.8.3 Procedures p. 32
6.8.4 Impacts on services, entities, and interfaces p. 32
6.9 Solution #9: Prevention of overload build up at home network using AMF based congestion control when local service is over p. 33
6.9.1 Introduction p. 33
6.9.2 High-level Description p. 33
6.9.3 Procedures p. 35
6.9.3.1 UE in CM Idle-State and AMF configured to send "Network/service availability timer" p. 35
6.9.3.2 UE in CM-Idle State and AMF not configured to send Network/service availability timer p. 37
6.9.3.3 UE in CM-Connected State and AMF not configured to send Network/service availability timer p. 39
6.9.4 Impacts on existing services and interfaces p. 40
6.10 Solution #10: Solution for discovery and selection of NPN hosting network and localized services p. 40
6.10.1 Introduction p. 40
6.10.2 Functional Description p. 41
6.10.2.1 UE selection of SNPN hosting network for localized services p. 41
6.10.2.2 UE selection of PNI-NPN hosting network for localized services p. 42
6.10.2.3 Enabling access to SNPN Hosting Network for a localized service p. 42
6.10.3 Procedures p. 43
6.10.3.1 Automatic discovery and selection of SNPNs for access to localized services p. 43
6.10.3.2 Leaving SNPN Localized services mode p. 43
6.10.3.3 Discovery and selection of PNI-NPNs with CAG for access to localized services p. 43
6.10.3.4 Leaving the PNI-NPNs with CAG for access to localized services p. 44
6.10.3.5 Manual discovery and selection of SNPNs for access to localized services p. 44
6.10.3.6 Enabling access to localized services: Registration procedure p. 44
6.10.4 Impacts on services, entities, and interfaces p. 45
6.11 Solution #11: Access to localized service by using LADN and roaming architecture p. 45
6.11.1 Introduction p. 45
6.11.2 Functional Description p. 45
6.11.2.1 Architecture p. 45
6.11.2.2 Hosting network discovery and selection p. 46
6.11.2.3 Registration to hosting network and access to Localized services p. 47
6.11.3 Procedures p. 47
6.11.3.1 Requesting Localized service information p. 47
6.11.3.2 Connection to hosting network and access to Localized services p. 48
6.11.4 Impacts on services, entities, and interfaces p. 48
6.12 Solution #12: Discovering services offered by SNPN/PNI-NPN while camping in a serving network p. 49
6.12.1 Introduction p. 49
6.12.2 Functional Description p. 49
6.12.3 Procedures p. 52
6.12.3.1 UE discovery, selection and access for hosting network using Registration procedure p. 52
6.12.3.2 UE discovery, selection and access for hosting network using UE Configuration Update procedure p. 53
6.12.3.3 UE discovery, selection and access for hosting network using Steering of Roaming procedure p. 54
6.12.4 Impacts on services, entities and interfaces p. 54
6.13 Solution #13: Exposure enhancements to support providing access to localized services p. 55
6.13.1 Introduction p. 55
6.13.2 Functional Description p. 56
6.13.3 Procedures p. 60
6.13.3.1 Procedure for enabling hosting network to provide access to localized services p. 60
6.13.3.2 Procedure for home network to update UE with the network selection information for the subscribed Hosting Network p. 62
6.13.3.3 Procedure for hosting network to instruct the UE to return to the home network p. 63
6.13.4 Impacts on services, entities, and interfaces p. 64
6.14 Solution #14: Solution for hosting network selection p. 64
6.14.1 Introduction p. 64
6.14.2 Functional Description p. 64
6.14.3 Procedures p. 65
6.14.4 Impacts on services, entities, and interfaces p. 67
6.15 Solution #15: Local service provisioning via PLMN p. 67
6.15.1 Introduction p. 67
6.15.2 Functional Description p. 67
6.15.3 Procedures p. 68
6.15.4 Impacts on Services, Entities, and Interfaces p. 68
6.16 Solution #16: Access to SNPN with NG-RAN and to WLAN Access Network using the same credentials p. 69
6.16.1 Introduction p. 69
6.16.2 Functional Description p. 69
6.16.3 Procedures p. 70
6.16.4 Impacts on services, entities, and interfaces p. 72
6.17 Solution #17: UE Group specific NAS level congestion control p. 72
6.17.1 Introduction p. 72
6.17.2 Functional Description p. 72
6.17.3 Procedures p. 73
6.17.4 Impacts on services, entities and interfaces p. 73
6.18 Solution #18: Steering of UE to select hosting network for obtaining localized services p. 74
6.18.1 Introduction p. 74
6.18.2 Functional Description p. 74
6.18.3 Procedures p. 74
6.18.4 Impacts on services, entities, and interfaces p. 76
6.19 Solution #19: Access to SNPN services via Untrusted non-3GPP access network with underlay/overlay determination p. 76
6.19.1 Introduction p. 76
6.19.2 Functional Description p. 76
6.19.3 Procedures p. 77
6.19.4 Impacts on services, entities, and interfaces p. 77
6.20 Solution #20: Access SNPN via 3GPP and N3GPP AN using same credentials and credential holder p. 78
6.20.1 Introduction p. 78
6.20.2 Functional Description p. 78
6.20.3 Procedures p. 79
6.20.4 Impacts on services, entities, and interfaces p. 79
6.21 Solution #21: Support for NSWOF in SNPN p. 80
6.21.1 Introduction p. 80
6.21.2 Functional Description p. 80
6.21.3 Procedures p. 81
6.21.4 Impacts on services, entities, and interfaces p. 81
6.22 Solution #22: Hosting network to provide localized service based on default credentials p. 82
6.22.1 Introduction p. 82
6.22.2 Functional Description p. 82
6.22.3 Procedures p. 83
6.22.4 Impacts on services, entities, and interfaces p. 83
6.23 Solution #23: Solution for obtaining hosting network selection and access information - PNI-NPN p. 84
6.23.1 Introduction p. 84
6.23.2 Functional Description p. 84
6.23.3 Procedures p. 85
6.23.4 Impacts on services, entities, and interfaces p. 86
6.24 Solution #24: Localized service data provisioning via UDR p. 86
6.24.1 Introduction p. 86
6.24.2 Functional Description p. 86
6.24.3 Procedures p. 87
6.24.3.1 Provisioning of non-UE specific localized service data to networks p. 87
6.24.3.2 Delivering localized service data to the UE via UE policy p. 88
6.24.4 Impacts on services, entities, and interfaces p. 89
6.25 Solution #25: Temporary network reselection for localized service support p. 89
6.25.1 Introduction p. 89
6.25.2 Functional Description p. 89
6.25.3 Procedures p. 90
6.25.3.1 Overview of Temporary Network Reselection (TNR) to enable localized services p. 90
6.25.3.2 Home network authorization via Steering of Roaming (SOR) procedure p. 92
6.25.4 Impacts on services, entities, and interfaces p. 93
6.26 Solution #26: Enable UE to query localized services information from the hosting network for service discovery p. 94
6.26.1 Introduction p. 94
6.26.2 Functional Description p. 94
6.26.3 Procedure p. 96
6.26.3.1 UE query local service information without registering with the hosting network p. 96
6.26.3.2 UE local service discovery while registering with the hosting network p. 97
6.26.4 Impacts on services, entities and interfaces p. 98
6.27 Solution #27: Access to localized service by using LADN and N3IWF overlay architecture p. 98
6.27.1 Introduction p. 98
6.27.2 Functional Description p. 99
6.27.2.1 Architecture p. 99
6.27.2.2 Hosting network discovery and selection p. 100
6.27.2.3 Registration to hosting network and access to Localized services p. 100
6.27.3 Procedures p. 101
6.27.3.1 Requesting Localized service information p. 101
6.27.3.2 Connection to hosting network and access to Localized services p. 101
6.27.4 Impacts on services, entities, and interfaces p. 102
6.28 Solution #28: OTT solution for access to localized services p. 102
6.28.1 Introduction p. 102
6.28.2 Functional Description p. 102
6.28.3 Procedures p. 104
6.28.4 Impacts on services, entities, and interfaces p. 105
6.29 Solution #29: Solution for enabling UE to automatic discover and select a network for accessing local services on top of solution #10 p. 105
6.29.1 Introduction p. 105
6.29.2 Functional Description p. 105
6.29.3 Procedures p. 106
6.29.4 Impacts on services, entities and interfaces p. 107
6.30 Solution #30: Solution for steering a UE to a Hosting Network by Home Network p. 107
6.30.1 Introduction p. 107
6.30.2 Steering a UE to an SNPN Hosting Network p. 108
6.30.2.1 The serving network is Home Network of the UE p. 108
6.30.2.2 The serving network is not Home Network of the UE p. 108
6.30.2.3 The selection of an SNPN Hosting Network without Home Network's steering p. 109
6.30.3 Procedure p. 109
6.30.3.1 Steer a UE to an SNPN Hosting Network when the serving network is UE's Home Network p. 109
6.30.3.2 Steer a UE to an SNPN Hosting Network when the serving network is not UE's Home Network p. 111
6.30.4 Impacts on services, entities, and interfaces p. 112
6.31 Solution #31: Discovery and selection of Hosting network based on broadcast information p. 112
6.31.1 Introduction p. 112
6.31.2 Functional Description p. 112
6.31.3 Procedures p. 113
6.31.4 Impacts on services, entities, and interfaces p. 113
6.32 Solution #32: Supporting PNI-NPN as hosting network p. 114
6.32.1 Introduction p. 114
6.32.2 Functional Description p. 114
6.32.3 Procedures p. 115
6.32.4 Impacts on services, entities, and interfaces p. 116
6.33 Solution #33: network selection for accessing to a hosting network p. 116
6.33.1 Introduction p. 116
6.33.2 Functional Description p. 117
6.33.3 Procedures p. 117
6.33.4 Impacts on services, entities, and interfaces p. 117
6.34 Solution #34: Providing Human Readable Localized Services Information for manual selection p. 117
6.34.1 Introduction p. 117
6.34.2 Functional Description p. 118
6.34.2.1 Human Readable Localized Service information in On-Demand SIB p. 118
6.34.2.2 Construction of URL for webpage retrieval of Human Readable Localized service information. p. 118
6.34.3 Procedures p. 119
6.34.3.1 Procedure for Human Readable Localized Service information in On-Demand SIB p. 119
6.34.3.2 Procedure for retrieval of Localized service information from URL p. 120
6.34.4 Impacts on services, entities, and interfaces p. 120
6.35 Solution #35: Access to localized service by network slicing and URSP p. 120
6.35.1 Introduction p. 120
6.35.2 Functional Description p. 121
6.35.3 Procedures p. 121
6.35.4 Impacts on services, entities, and interfaces p. 122
6.36 Solution #36: Steering of UEs by home network to a specific hosting network with consideration of location, times, and coverage for key issue #5 p. 122
6.36.1 Introduction p. 122
6.36.2 Functional Description p. 123
6.36.3 Procedure p. 123
6.36.4 Impacts on services, entities and interfaces p. 124
6.37 Solution #37: Enabling access to localized services via a specific hosting network p. 125
6.37.1 Introduction p. 125
6.37.2 Functional Description p. 125
6.37.3 Procedures p. 126
6.37.4 Impacts on services, entities and interfaces p. 126
6.38 Solution #38: Sequential deregistration by hosting network p. 126
6.38.1 Introduction p. 126
6.38.2 Functional Description p. 126
6.38.3 Procedures p. 127
6.38.4 Impacts on services, entities, and interfaces p. 128
6.39 Solution #39: Local hosting network specific back-off timer p. 128
6.39.1 Introduction p. 128
6.39.2 Functional Description p. 129
6.39.3 Procedures p. 129
6.39.4 Impacts on services, entities and interfaces p. 130
6.40 Solution #40: Credential provisioning for accessing hosting network p. 130
6.40.1 Introduction p. 130
6.40.2 Functional Description p. 130
6.40.3 Procedures p. 131
6.40.4 Impacts on services, entities, and interfaces p. 132
6.41 Solution #41: Provisioning of Credentials via Hosting Network PDU Session p. 133
6.41.1 Introduction p. 133
6.41.2 Functional Description p. 133
6.41.3 Procedures p. 134
6.41.4 Impacts on services, entities and interfaces p. 135
6.42 Solution #42: Solution of UE requesting for hosting network selection and access information via visiting network p. 135
6.42.1 Introduction p. 135
6.42.2 Functional Description p. 135
6.42.3 Procedures p. 136
6.42.4 Impacts on services, entities, and interfaces p. 137
6.43 Solution #43: Solution for Transferring hosting network selection information from hosting network to UE's home network p. 137
6.43.1 Introduction p. 137
6.43.2 Functional Description p. 137
6.43.3 Procedures p. 138
6.43.4 Impacts on services, entities, and interfaces p. 138
6.44 Solution #44: Solution on top of Solution #10 for Serving Network to assist in discovery of hosting networks p. 139
6.44.1 Introduction p. 139
6.44.2 Functional Description p. 139
6.44.2.1 General p. 139
6.44.2.2 Serving network assistance information in SIB p. 139
6.44.2.3 Serving network assistance via dedicated signalling p. 140
6.44.3 Procedures p. 140
6.44.3.1 Procedure for Hosting network search assistance information in SIB p. 140
6.44.3.2 Procedure for Hosting network search assistance information in SIB p. 141
6.44.4 Impacts on services, entities and interfaces p. 142
6.45 Solution #45: Ensuring UE access localized service in the service area/time p. 142
6.45.1 Introduction p. 142
6.45.2 Functional Description p. 142
6.45.3 Procedures p. 143
6.45.4 Impacts on services, entities, and interfaces p. 144
6.46 Solution #46: Accesses Localized Services via URSP rules p. 144
6.46.1 Introduction p. 144
6.46.2 Functional Description p. 144
6.46.3 Procedures p. 145
6.46.4 Impacts on services, entities, and interfaces p. 145
6.47 Solution #47: Solution for mitigating overload at home network p. 145
