Content for TR 23.724 Word version: 16.1.0
6 Solutions
6.1 Solution 1: Infrequent small data transfer via NAS-SM and N6
6.2 Solution 2: Infrequent small data transfer through NAS and a direct interface between AMF and UPF
6.3 Solution 3: Infrequent small data transmission with no PDU session available
6.4 Solution 4: Reliable Data Service Support
6.5 Solution 5: Small Data Fast Path communication
6.6 Solution 6: Small Data Communication based on Data PDU routed over the User Plane.
6.7 Solution 7: Small data frequent communication
6.8 Solution 8: Enhancing MICO for Mobile terminated data/signaling
6.9 Solution 9: Enhanced MICO mode with Active Time
6.10 Solution 10: Solution for supporting High Latency Communication
6.11 Solution 11: Extended buffering in SMF and NEF
6.12 Solution 12: Solution for Management of Enhanced Coverage for 5GC
6.13 Solution 13: SCEF+NEF Node
6.14 Solution 14: APISupportCapability service
6.15 Solution 15: External parameter provisioning in the 5GC
6.16 Solution 16: UE assisted Inter-UE QoS Support for Data over NAS
6.17 Solution 17: UE-Driven Packet Classification
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6 Solutions p. 34
6.1 Solution 1: Infrequent small data transfer via NAS-SM and N6 p. 34
6.1.1 Introduction p. 34
6.1.1.1 General p. 34
6.1.1.2 Architecture reference models p. 34
6.1.2 Functional Description p. 36
6.1.3 Support of EPC interworking p. 38
6.1.4 Procedures p. 39
6.1.4.0 General p. 39
6.1.4.1 PDU Session Establishment p. 39
6.1.4.2 Mobile Originated Data Transport via NAS-SM and N6 p. 40
6.1.4.3 Mobile Terminated Data Transport via NAS-SM and N6 p. 42
6.1.5 Impacts on existing entities and interfaces p. 43
6.1.6 Evaluation p. 44
6.2 Solution 2: Infrequent small data transfer through NAS and a direct interface between AMF and UPF p. 45
6.2.1 Introduction p. 45
6.2.2 Functional Description p. 45
6.2.3 Support of EPC interworking p. 46
6.2.4 Procedures p. 46
6.2.4.1 Nx tunnel setup p. 46
6.2.4.2 Nx tunnel release p. 47
6.2.4.3 MO data transport p. 48
6.2.4.4 MT data transport p. 49
6.2.4.5 NIDD support p. 49
6.2.5 Impacts on existing entities and interfaces p. 50
6.2.6 Evaluation p. 51
6.3 Solution 3: Infrequent small data transmission with no PDU session available p. 51
6.3.1 Introduction p. 51
6.3.2 Functional Description p. 51
6.3.3 Support of EPC interworking p. 51
6.3.4 Procedures p. 51
6.3.4.1 Registration Procedure p. 51
6.3.4.2 MO NSDD procedure p. 52
6.3.4.3 MT Small data transmission procedure p. 54
6.3.5 Impacts on existing entities and interfaces p. 54
6.3.6 Evaluation p. 55
6.4 Solution 4: Reliable Data Service Support p. 55
6.4.1 Introduction p. 55
6.4.2 Functional Description p. 55
6.4.3 Support of EPC interworking p. 57
6.4.4 Procedures p. 58
6.4.4.1 Registration procedure supporting reliable small data delivery over NAS p. 58
6.4.4.2 RDS Configuration procedure between NEF and AF/AS p. 59
6.4.4.3 MO reliable small data delivery procedure p. 60
6.4.4.4 MT reliable small data delivery procedure p. 61
6.4.5 Impacts on existing entities and interfaces p. 61
6.4.6 Evaluation p. 62
6.5 Solution 5: Small Data Fast Path communication p. 62
6.5.1 Introduction p. 62
6.5.2 Functional Description p. 62
6.5.2.1 General p. 62
6.5.2.2 Mobility p. 63
6.5.2.3 Security p. 63
6.5.2.4 UPF and PDU Session information in the UE p. 63
6.5.3 Support of EPC interworking p. 64
6.5.4 Procedures p. 65
6.5.4.1 UE requested SDFP PDU session establishment p. 65
6.5.4.2 SDFP transfer initiated by UL data p. 66
6.5.4.3 Alternative 1: SDFP transfer initiated by DL data p. 67
6.5.4.3a Alternative 2: SDFP transfer initiated by DL data p. 69
6.5.5 Impacts on existing entities and interfaces p. 70
6.5.6 Evaluation p. 70
6.6 Solution 6: Small Data Communication based on Data PDU routed over the User Plane. p. 70
6.6.1 Introduction p. 70
6.6.1.1 General p. 70
6.6.1.2 Protocol stack for User data p. 70
6.6.1.3 Architecture reference models p. 71
6.6.2 Functional Description p. 71
6.6.3 Support of EPC interworking p. 72
6.6.4 Procedures p. 73
6.6.4.1 Small Data via UPF p. 73
6.6.4.1.1 General p. 73
6.6.4.1.2 Assumptions p. 73
6.6.4.1.3 PDU Session Establishment p. 74
6.6.4.1.4 Mobile Originated Data Transport p. 75
6.6.4.1.4b Mobile Originated Data Transport, using EDT and AS based RAI p. 76
6.6.4.1.5 Mobile Terminated Data Transport p. 77
6.6.4.2 NIDD via NEF specific procedures p. 78
6.6.5 Impacts on existing entities and interfaces p. 81
6.6.6 Evaluation p. 81
6.7 Solution 7: Small data frequent communication p. 82
6.7.1 Introduction p. 82
6.7.2 Functional Description p. 82
6.7.3 Support of EPC interworking p. 82
6.7.4 Procedures p. 83
6.7.4.1 MO transmissions p. 83
6.7.4.1.0 General p. 83
6.7.4.1.1 MO transmission with RRC Inactive p. 83
6.7.4.1.2 MO transmission with Early Data Transmission and RRC Inactive p. 84
6.7.4.2 MT transmissions p. 86
6.7.5 Impacts on existing entities and interfaces p. 87
6.7.6 Evaluation p. 88
6.8 Solution 8: Enhancing MICO for Mobile terminated data/signaling p. 88
6.8.1 Introduction p. 88
6.8.1.1 General p. 88
6.8.2 Functional Description p. 88
6.8.3 Support of EPC interworking p. 89
6.8.4 Procedures p. 89
6.8.5 Impacts on existing entities and interfaces p. 89
6.8.6 Evaluation p. 89
6.9 Solution 9: Enhanced MICO mode with Active Time p. 90
6.9.1 Introduction p. 90
6.9.2 Functional Description p. 90
6.9.3 Support of interworking p. 91
6.9.4 Procedures p. 91
6.9.5 Impacts on existing entities and interfaces p. 91
6.9.6 Evaluation p. 92
6.10 Solution 10: Solution for supporting High Latency Communication p. 92
6.10.1 Introduction p. 92
6.10.2 Functional Description p. 92
6.10.3 Support of interworking p. 92
6.10.4 Procedures p. 92
6.10.4.1 Support for UE Reachability Notification for Mobile Terminated Communication p. 92
6.10.4.2 Support for UE Availability Notification Procedure after DDN Failure p. 93
6.10.5 Impacts on existing entities and interfaces p. 94
6.10.6 Evaluation p. 95
6.11 Solution 11: Extended buffering in SMF and NEF p. 95
6.11.1 Introduction p. 95
6.11.2 Functional Description p. 95
6.11.3 Support of interworking p. 95
6.11.4 Procedures p. 95
6.11.5 Impacts on existing entities and interfaces p. 97
6.11.6 Evaluation p. 97
6.12 Solution 12: Solution for Management of Enhanced Coverage for 5GC p. 97
6.12.1 Introduction p. 97
6.12.2 Functional Description p. 97
6.12.2.1 Support of Enhanced Coverage p. 97
6.12.2.2 Support of restriction of use of Enhanced Coverage p. 97
6.12.3 Support of EPC interworking p. 98
6.12.4 Procedures p. 98
6.12.4.1 Procedure for restriction of use of Enhanced Coverage p. 98
6.12.4.2 Enhanced Coverage Restriction Control and via NEF p. 99
6.12.5 Impacts on existing entities and interfaces p. 100
6.12.6 Evaluation p. 101
6.13 Solution 13: SCEF+NEF Node p. 101
6.13.1 Introduction p. 101
6.13.2 Functional Description p. 102
6.13.3 Support of EPC interworking p. 103
6.13.4 Procedures p. 103
6.13.5 Impacts on existing entities and interfaces p. 103
6.13.6 Evaluation p. 103
6.14 Solution 14: APISupportCapability service p. 103
6.14.1 Introduction p. 103
6.14.2 Functional Description p. 103
6.14.3 Support of EPC interworking p. 105
6.14.4 Procedures p. 105
6.14.4.1 Subscribe and Notify service operations information flow p. 105
6.14.4.2 Unsubscribe service operation information flow p. 106
6.14.4.3 Query service operation information flow p. 107
6.14.5 Impacts on existing entities and interfaces p. 108
6.14.6 Evaluation p. 108
6.15 Solution 15: External parameter provisioning in the 5GC p. 109
6.15.1 Introduction p. 109
6.15.2 Functional Description p. 109
6.15.3 Support of EPC interworking p. 109
6.15.4 Procedures p. 110
6.15.5 Impacts on existing entities and interfaces p. 111
6.15.6 Evaluation p. 112
6.16 Solution 16: UE assisted Inter-UE QoS Support for Data over NAS p. 112
6.16.1 Introduction p. 112
6.16.2 Functional Description p. 112
6.16.3 Support of EPC interworking p. 113
6.16.4 Procedures p. 113
6.16.4.1 QoS Index configuration during Registration Procedure p. 113
6.16.4.2 Using QoS index in MO Data over NAS p. 113
6.16.5 Impacts on existing entities and interfaces p. 114
6.16.6 Evaluation p. 115
6.17 Solution 17: UE-Driven Packet Classification p. 115
6.17.1 Introduction p. 115
6.17.2 Functional Description p. 115
6.17.3 Support of EPC interworking p. 115
6.17.4 Procedures p. 116
6.17.5 Impacts on existing entities and interfaces p. 117
6.17.6 Evaluation p. 117
