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TR 23.700-41
Study on enhancement of Network Slicing – Phase 3

3GPP‑Page   fToC↓   Partial Content →
V18.0.0 (Wzip)  2022/12  167 p.
Rapporteur:
Mr. Zhu, Jinguo
ZTE Corporation

full Table of Contents for  TR 23.700-41  Word version:  18.0.0

each clause number in 'red' refers to the equivalent title in the Partial Content
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1Scope  p. 11
2References  p. 11
3Definitions of terms and abbreviations  p. 12
3.1Terms  p. 12
3.2Abbreviations  p. 12
4Architectural Assumptions and Requirements  p. 12
5Key Issues  p. 12
5.1Key Issue #1: Support of Network Slice Service continuity  p. 12
5.1.1Description  p. 12
5.2Key Issue #2: Support of providing VPLMN network slice information to a roaming UE  p. 13
5.2.1Description  p. 13
5.3Key Issue #3: Network Slice Area of Service for services not mapping to existing TAs boundaries and Temporary network slices  p. 13
5.3.1Description  p. 13
5.4Key Issue #4: Support of NSAC involving multi service Area  p. 14
5.4.1Description  p. 14
5.5Key Issue #5: Improved support of RAs including TAs supporting Rejected S-NSSAIs  p. 14
5.5.1General description  p. 14
5.6Key Issue #6: Improved network control of the UE behaviour  p. 15
5.6.1Description  p. 15
6Solutions  p. 16
6.0Mapping of Solutions to Key Issues  p. 16
6.1Solution #1: Additional S-NSSAI associated with the PDU session  p. 18
6.1.1Introduction  p. 18
6.1.2Functional Description  p. 18
6.1.3Procedures  p. 19
6.1.3.1Additional S-NSSAI handling during Handover Procedure  p. 19
6.1.3.2Additional S-NSSAI handling during PDU Session Establishment Procedure  p. 19
6.1.4Impacts on existing entities and interfaces  p. 20
6.2Solution #2: Slice Re-mapping Capabilities for Network Slice Service Continuity  p. 21
6.2.1Introduction  p. 21
6.2.2Functional Description  p. 21
6.2.3Procedures  p. 21
6.2.3.1General  p. 21
6.2.3.2Registration  p. 21
6.2.3.3Change of S-NSSAI of a PDU Session  p. 22
6.2.3.4AMF-triggered PDU Session Modification to change of S-NSSAI of PDU Session  p. 23
6.2.4Impacts on services, entities and interfaces  p. 24
6.3Solution #3: Support of Network Slice Service continuity using a SSC mode 3 type of Service continuity  p. 24
6.3.1Introduction  p. 24
6.3.2Functional Description  p. 24
6.3.3Procedures  p. 24
6.3.4Impacts on services, entities and interfaces  p. 26
6.4Solution #4: PDU Session on compatible network slice  p. 26
6.4.1Introduction  p. 26
6.4.2Functional description  p. 27
6.4.3Procedures  p. 27
6.4.4Impacts on services, entities and interfaces  p. 27
6.5Solution #5: PDU session handover to a target CN with an alternative S-NSSAI support  p. 28
6.5.1Introduction  p. 28
6.5.2Functional description  p. 28
6.5.3Procedures  p. 28
6.5.4Impacts on services, entities and interfaces  p. 29
6.6Solution #6: Extended SoR VPLMN Slice Information transfer to UEs  p. 29
6.6.1Introduction  p. 29
6.6.2Functional Description  p. 29
6.6.3Procedures  p. 30
6.6.3.1Extended SoR VPLMN Slice Information transfer to UE  p. 30
6.6.3.1.1UE Initiated capability indication  p. 31
6.6.3.1.2Network Triggered capability indication  p. 33
6.6.4Impacts on Existing Nodes and Functionality  p. 34
6.7Solution #7: Enabling awareness of Network Slice availability in VPLMNs  p. 34
6.7.1Introduction  p. 34
6.7.2Functional Description  p. 34
6.7.3Procedures  p. 35
6.7.3.1Option 1 - UE's USIM is NOT configured to receive a Slice-Aware SoR  p. 35
6.7.3.2Option 2 - UE's USIM is configured to receive a Slice-Aware SoR  p. 36
6.7.4Impacts on services, entities and interfaces  p. 36
6.8Solution #8: Gracefully network slice termination  p. 37
6.8.1Introduction  p. 37
6.8.2Functional Description  p. 38
6.8.3Procedures  p. 38
6.8.4Impacts on services, entities and interfaces  p. 40
6.9Solution #9: Support of a Network Slice with an AoS not matching existing TA boundaries.  p. 41
6.9.1Introduction  p. 41
6.9.2Description  p. 41
6.9.3Procedures  p. 42
6.9.4Impacts on services, entities and interfaces  p. 44
6.10Solution #10: Associating a validity timer with a temporary slice  p. 45
6.10.1Introduction  p. 45
6.10.2Procedures  p. 46
6.10.3Impacts on services, entities and interfaces  p. 46
6.11Solution #11: Enabling UEs to Request S-NSSAIs not uniformly available  p. 47
6.11.1Introduction  p. 47
6.11.2Functional Description  p. 47
6.11.3Procedures  p. 48
6.11.3.1Registration Procedure  p. 48
6.11.3.2UE Configuration Update Procedure  p. 49
6.11.3.3UE Requested PDU Session Establishment Procedure  p. 49
6.11.3.4Service Request  p. 49
6.11.3.5PDU Session Release  p. 49
6.11.4Impacts on services, entities and interfaces  p. 49
6.12Solution #12: Solution for Centralized Counting for Multiple Service Areas and 5GS-EPS Interworking  p. 50
6.12.1Description  p. 50
6.12.2Procedures  p. 51
6.12.2.1UE Registration Admission  p. 51
6.12.2.1.15GS only slices  p. 51
6.12.2.1.25GS-EPS Interworking with EPS Counting Active  p. 51
6.12.2.2Roaming  p. 52
6.12.2.3UE PDU Session Admission  p. 52
6.12.2.3.15GS only slices  p. 52
6.12.2.3.25GS-EPS Interworking with EPS Counting Active  p. 53
6.12.2.4Discovery of Central NSACF  p. 53
6.12.3Impacts on services, entities and interfaces  p. 53
6.13Solution #13: Hierarchical NSACF Architecture for Maximum UE/PDU Session number control  p. 54
6.13.1Introduction  p. 54
6.13.2Functional Description  p. 54
6.13.3Procedures  p. 56
6.13.3.1Registration management Procedures  p. 56
6.13.3.2PDU Session management Procedures  p. 58
6.13.3.3Redistribution of local maximum number  p. 59
6.13.3.4Session continuity handling  p. 59
6.13.3.5HPLMN control and EPS counting support  p. 60
6.13.4Impacts on services, entities and interfaces  p. 60
6.14Solution #14: Maximum Number Distribution in multiple NSACFs  p. 60
6.14.1Introduction  p. 60
6.14.2Functional Description  p. 61
6.14.3Procedure  p. 61
6.14.4Impacts on services, entities and interfaces  p. 61
6.15Solution #15: Service continuity in case of Network Slice instance overload  p. 62
6.15.1Introduction  p. 62
6.15.2Functional Description  p. 62
6.15.3Procedures  p. 63
6.15.4Impacts on services, entities and interfaces  p. 63
6.16Solution #16: UE assisted slice based VPLMN prioritization for Extended SoR  p. 64
6.16.1Introduction  p. 64
6.16.2High Level Description  p. 64
6.16.3Procedures  p. 64
6.16.4Impacts on services, entities and interfaces  p. 66
6.17Solution #17: Slice based VPLMN Selection Policy  p. 66
6.17.1Introduction  p. 66
6.17.2Functional Description  p. 66
6.17.3Procedures  p. 67
6.17.4Impacts on services, entities and interfaces  p. 68
6.18Solution #18: Sending rejected NSSAI to the UDM to assist the UDM to steer the UE to the PLMN supporting rejected NSSAI  p. 68
6.18.1Introduction  p. 68
6.18.2Procedures  p. 68
6.18.3Impacts on services, entities and interfaces  p. 69
6.19Solution #19: Configuring the UE with network slice aware preferred PLMNs lists  p. 70
6.19.1Introduction  p. 70
6.19.2Functional Description  p. 70
6.19.3Procedures  p. 71
6.19.4Impacts on services, entities and interfaces  p. 73
6.20Solution #20: PLMN Selection following existing SoR information  p. 73
6.20.1Introduction  p. 73
6.20.2Functional Description  p. 73
6.20.3Procedures  p. 74
6.20.4Impacts on services, entities and interfaces  p. 74
6.21Solution #21: Temporary slice based on URSP  p. 75
6.21.1Introduction  p. 75
6.21.2Functional Description  p. 75
6.21.3Procedures  p. 75
6.21.4Impacts on services, entities and interfaces  p. 75
6.22Solution #22: Enabling graceful slice termination with support of UE policies  p. 76
6.22.1Introduction  p. 76
6.22.2Functional Description  p. 76
6.22.3Procedures  p. 77
6.22.4Impacts on services, entities and interfaces  p. 77
6.23Solution #23: UE registration for conditional network slices  p. 77
6.23.1Introduction  p. 77
6.23.2Functional description  p. 77
6.23.3Procedures  p. 78
6.23.4Impacts on services, entities and interfaces  p. 79
6.24Solution #24: On the handling of temporary network slices  p. 79
6.24.1Introduction  p. 79
6.24.2Functional Description  p. 79
6.24.3Procedures  p. 80
6.24.3.1RM aspects  p. 80
6.24.3.2Session Management aspect  p. 81
6.24.4Impacts on services, entities and interfaces  p. 84
6.25Solution #25: Handling Rejected S-NSSAIs in some TAs of RA  p. 85
6.25.1Key Issue mapping  p. 85
6.25.2Functional Description  p. 85
6.25.3Procedures  p. 86
6.25.4Impacts on services, entities and interfaces  p. 87
6.26Solution #26: Multiple areas and resource partitioning  p. 87
6.26.1Introduction  p. 87
6.26.2Functional Description  p. 88
6.26.2.1Support of multiple areas  p. 88
6.26.2.2Reducing resources for cells outside service area  p. 88
6.26.3Procedures  p. 90
6.26.4Impacts on services, entities and interfaces  p. 91
6.27Solution #27: Exception to the rejected NSSAI handling  p. 91
6.27.1Introduction  p. 91
6.27.2Functional Description  p. 91
6.27.3Procedures  p. 92
6.27.4Impacts on services, entities and interfaces  p. 93
6.28Solution #28: Support of network slices with TA granularity within a RA  p. 93
6.28.1Functional Description  p. 93
6.28.2Procedures  p. 94
6.28.3Impacts on Existing Nodes and Functionality  p. 94
6.29Solution #29: On handling S-NSSAIs not supported in certain TAs of a RA during a registration  p. 94
6.29.1Introduction  p. 94
6.29.2Functional Description  p. 95
6.29.3Procedures  p. 96
6.29.3.1Indication to UE of TAIs where the rejected S-NSSAI is supported (or is not supported) in the RA  p. 96
6.29.3.2Indication to UE of Allowed NSSAI in RA and of Partially Allowed S-NSSAIs in RA with TAIs of RA where the Partially Allowed S-NSSAIs is supported.  p. 97
6.29.3.2.1Registration  p. 97
6.29.3.2.2MO Procedure from idle mode  p. 98
6.29.3.2.3MT Procedure from idle mode  p. 101
6.29.3.2.4Connected Mode system behaviour  p. 103
6.29.3.2.5Session management  p. 106
6.29.3.2.6AN Release  p. 106
6.29.4Impacts on services, entities and interfaces  p. 106
6.30Solution #30: Rejected S-NSSAI with new cause value  p. 107
6.30.1Introduction  p. 107
6.30.2Functional Description  p. 107
6.30.3Procedure  p. 107
6.30.4Impacts on services, entities and interfaces  p. 108
6.31Solution #31: Enabling Flexible RAs with Slice Service Area  p. 108
6.31.1Introduction  p. 108
6.31.2Functional Description  p. 108
6.31.3Procedures  p. 108
6.31.3.1Option A - Reject Slices that are Not Available in the current TA  p. 108
6.31.3.2Option B - Neither Reject nor Allow Slices that are Not Available in the current TA  p. 109
6.31.4Impacts on services, entities and interfaces  p. 109
6.32Solution #32: Solution for Network Control for UE Slice Use  p. 110
6.32.1Description  p. 110
6.32.2Procedures  p. 111
6.32.2.1PDU session Transfer from Source Slice to Target Slice, UE Initiated approach  p. 111
6.32.2.2PDU Session Transfer from Source Slice to Target Slice - Network Initiated Approach  p. 112
6.32.2.2.1AMF Initiated Approach  p. 112
6.32.2.2.2PCF Initiated Approach  p. 113
6.32.2.3SSC Mode and PDU Session Transfer from Source Network Slice to Target Network Slice  p. 114
6.32.3Impacts on Existing Nodes and Functionality  p. 114
6.33Solution #33: Slice-specific implicit deactivation timers  p. 114
6.33.1Functional Description  p. 114
6.33.1.1Registration control  p. 114
6.33.1.2PDU session control  p. 115
6.33.2Procedures  p. 115
6.33.3Impacts on Existing Nodes and Functionality  p. 115
6.34Solution #34: On-demand slices  p. 115
6.34.1Functional Description  p. 115
6.34.2Procedures  p. 116
6.34.3Impacts on Existing Nodes and Functionality  p. 116
6.35Solution #35: Network Slice usage control by the network  p. 116
6.35.1Introduction  p. 116
6.35.2Functional description  p. 116
6.35.3Procedures  p. 117
6.35.4Impacts on services, entities and interfaces  p. 118
6.36Solution #36: UE provided reason for registration to S-NSSAI  p. 118
6.36.1Introduction  p. 118
6.36.2Functional Description  p. 118
6.36.3Procedures  p. 119
6.36.4Impacts on services, entities and interfaces  p. 120
6.37Solution #37: Actual UE Activity-based Slice Admission Control  p. 120
6.37.1Introduction  p. 120
6.37.2Functional Description  p. 121
6.37.3Procedures  p. 121
6.37.4Impacts on services, entities and interfaces  p. 123
6.38Solution #38: On configuring the UE with UE behaviour policies  p. 123
6.38.1Introduction  p. 123
6.38.2Functional Description  p. 123
6.38.3Procedures  p. 124
6.38.3.1USIM default configuration.  p. 124
6.38.3.2Control plane procedures  p. 125
6.38.3.2.1UDM Option  p. 125
6.38.3.2.2NSSF/PCF Option 2  p. 127
6.38.3.3URSP possible impact  p. 129
6.38.4Impacts on services, entities and interfaces  p. 129
6.39Solution #39: Serving PLMN steering UE to preferred slice for selection of PDU session  p. 130
6.39.1Description  p. 130
6.39.2Procedures  p. 131
6.39.3Impacts on Existing Nodes and Functionality  p. 131
6.40Solution #40: S-NSSAI change decided by PCF  p. 131
6.40.1Introduction  p. 131
6.40.2Functional Description  p. 132
6.40.3Procedures  p. 132
6.40.3.1The S-NSSAI change determination by PCF for an ongoing PDU session on non-roaming and local breakout roaming scenario  p. 132
6.40.3.2The S-NSSAI change determination by PCF for an ongoing PDU session triggered by an SMF report on home-routed roaming cases  p. 134
6.40.4Impacts on services, entities and interfaces  p. 135
6.41Solution #41: Network Slice change without service interruption  p. 136
6.41.1Introduction  p. 136
6.41.2Functional Description  p. 136
6.41.3Procedures  p. 136
6.41.3.1General  p. 136
6.41.3.2Change of network slice  p. 136
6.41.4Impacts on services, entities and interfaces  p. 137
6.42Solution #42: Network controlled change to an alternative S-NSSAI  p. 138
6.42.1Introduction  p. 138
6.42.2Functional Description  p. 138
6.42.3Procedures  p. 139
6.42.4Impacts on services, entities and interfaces  p. 142
6.43Solution #43: Allowed NSSAI Determination in Initial Registration to Support Network Slice Service Continuity  p. 142
6.43.1Introduction  p. 142
6.43.2Functional Description  p. 142
6.43.3Procedures  p. 143
6.43.3.1Secondary NSSAI Determination  p. 143
6.43.3.2PDU Session Transferred to a New Network Slice in No Mobility Scenario  p. 144
6.43.3.3PDU session transferred to a new network slice in mobility scenario  p. 144
6.43.4Impacts on services, entities and interfaces  p. 145
6.44Solution #44: Controlling UE access to the network per Network Slice on a per cell level granularity  p. 145
6.44.1Introduction  p. 145
6.44.2Functional Description  p. 145
6.44.3Procedures  p. 146
6.44.3.1General  p. 146
6.44.3.2Mobility procedures  p. 147
6.44.4Impacts on services, entities and interfaces  p. 147
6.45Solution #45: Constrained Service Area for the Network Slice  p. 147
6.45.1Introduction  p. 147
6.45.2Functional Description  p. 147
6.45.3Procedures  p. 148
6.45.3.1Configuration of Constrained Service Area information  p. 148
6.45.3.2UE mobility  p. 148
6.45.4Impacts on services, entities and interfaces  p. 148
6.46Solution #46: Controlling network slice based on UE's inactive PDN connection  p. 148
6.46.1Introduction  p. 148
6.46.2Functional Description  p. 148
6.46.3Procedures  p. 149
6.46.4Impacts on services, entities and interfaces  p. 149
7Overall Evaluation  p. 149
7.1Evaluation for KI#1  p. 149
7.2Evaluation for KI#2  p. 154
7.3Evaluation for KI#3  p. 154
7.4Evaluation for KI#4  p. 156
7.5Evaluation for KI#5  p. 156
7.6Evaluation for KI#6  p. 157
8Conclusions  p. 160
8.1Conclusions for KI#1  p. 160
8.2Conclusions for KI#2  p. 161
8.3Conclusions for KI#3  p. 162
8.4Conclusions for KI#4  p. 163
8.5Conclusions for KI #5  p. 165
8.6Conclusions for KI #6  p. 165
$Change history  p. 167

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