Content for TR 23.700-40 Word version: 17.0.0
5 Key Issues
6 Solutions
6.0 Mapping Solutions to Key Issues
6.1 Solution #1: PCF measurement based Network Slice SLA control for Maximum Number of UEs parameter
6.2 Solution #2: Max number of UEs per Network Slice control at registration
6.3 Solution #3: AMF/NSSF based counting of UEs in a Network Slice
6.4 Solution #4: NWDAF enhancements for supporting of network slice quota on the maximum number of UEs
6.5 Solution #5: NWDAF enhancements for supporting of network slice quota on the maximum number of PDU Sessions
6.6 Solution #6: PCF-based counting of PDU Sessions in a Network Slice
6.7 Solution #7: Support of Network Slice SLA for Maximum Number of PDU sessions parameter
6.8 Solution #8: AMF and O&M based solution
6.9 Solution #9: Monitoring multiple quotas of number of UEs/PDU Sessions per S-NSSAI at NWDAF
6.10 Solution #10: Max number of PDU Sessions per Network Slice control via NSQ function
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5 Key Issues p. 13
5.1 Key Issue #1: Support of network slice related quota on the maximum number of UEs p. 13
5.2 Key Issue #2: Support of network slice related quota on the maximum number of PDU Sessions p. 14
5.3 Key Issue #3: limitation of data rate per network slice in UL and DL per UE p. 15
5.4 Key Issue #4: Support for network slice quota event notification in a network slice p. 16
5.5 Key Issue #5: Dynamic adjustment to meet the limitation of data rate per network slice in UL and DL p. 16
5.6 Key Issue #6: Constraints on simultaneous use of the network slice p. 17
5.7 Key Issue #7: Support of 5GC assisted cell selection to access network slice p. 18
5.8 Key Issue #8: Area of service: impact on PLMN selection in roaming p. 18
6 Solutions p. 19
6.0 Mapping Solutions to Key Issues p. 19
6.1 Solution #1: PCF measurement based Network Slice SLA control for Maximum Number of UEs parameter p. 20
6.1.1 Introduction p. 20
6.1.2 High-level Description p. 21
6.1.3 Procedures p. 21
6.1.3.1 General p. 21
6.1.3.2 General Registration with Quota Enforcement p. 23
6.1.3.3 Deregistration with Slice SLA Quota Update p. 25
6.1.3.4 Controlling (re)-distribution of local quota of Slice SLA attributes p. 26
6.1.3.5 Controlling quota of Slice SLA attribute of Maximum Number of UEs at Roaming p. 27
6.1.3.6 Network Slice Specific Authentication and Authorization with Slice SLA Quota Update p. 27
6.1.4 Impacts on services, entities and interfaces p. 28
6.2 Solution #2: Max number of UEs per Network Slice control at registration p. 28
6.2.1 Introduction p. 28
6.2.2 High-level Description p. 28
6.2.3 Procedures p. 29
6.2.3.1 Max number of UEs per Network Slice control at registration p. 29
6.2.3.2 Max number of UEs per Network Slice control at Network Slice Specific Authentication and Authorisation (NSSAA) p. 30
6.2.3.3 Max number of UEs per Network Slice control at deregistration. p. 31
6.2.3.4 Max number of UEs per Network Slice control in roaming. p. 31
6.2.4 Impacts on services, entities and interfaces p. 32
6.2.5 Evaluation p. 32
6.3 Solution #3: AMF/NSSF based counting of UEs in a Network Slice p. 32
6.3.1 Introduction p. 32
6.3.2 High-level Description p. 33
6.3.3 Procedures p. 34
6.3.3.1 Registration with S-NSSAIs subject to Quota management/capping added p. 34
6.3.3.2 Registration with S-NSSAIs subject to Quota management/capping abandoned p. 35
6.3.3.3 Deregistration with S-NSSAIs subject to Quota management / capping p. 36
6.3.3.4 V-NSSF to H-NSSF interaction for S-NSSAIs of HPLMN subject to Quota management / capping. p. 37
6.3.4 Impacts on services, entities and interfaces p. 37
6.4 Solution #4: NWDAF enhancements for supporting of network slice quota on the maximum number of UEs p. 38
6.4.1 Introduction p. 38
6.4.2 High-level Description p. 38
6.4.2.1 NWDAF awareness of network slice quota on the maximum number of UEs p. 38
6.4.2.2 NWDAF awareness of current number of UEs concurrently registered to a network slice p. 38
6.4.2.3 NWDAF supports for network slice quota enforcement by other 5GC NFs p. 38
6.4.3 Procedures p. 39
6.4.3.1 Procedure for network slice quota information from OAM p. 39
6.4.3.2 Procedure for collection the information of the current number of UEs registered to a network slice p. 39
6.4.3.2.1 Procedure for collection the information of the current number of UEs registered to a network slice from AMF p. 39
6.4.3.2.2 Procedure for collection the information of the current number of UEs registered to a network slice from OAM p. 40
6.4.3.3 Procedure for subscribing and notifying the event of network slice quota reached status p. 41
6.4.3.4 Procedure for requesting for the network slice quota reached status p. 41
6.4.3.5 Procedure for network slice quota checking in non-roaming or local breakout roaming case p. 42
6.4.3.6 Procedure for the network slice quota checking in home-routed roaming case p. 43
6.4.4 Impacts on services, entities and interfaces p. 44
6.5 Solution #5: NWDAF enhancements for supporting of network slice quota on the maximum number of PDU Sessions p. 44
6.5.1 Introduction p. 44
6.5.2 High-level Description p. 45
6.5.2.1 NWDAF awareness of network slice quota on the maximum number of PDU Sessions p. 45
6.5.2.2 NWDAF awareness of current number of PDU Sessions concurrently established within a network slice p. 45
6.5.2.3 NWDAF supports for network slice quota enforcement by other 5GC NFs p. 45
6.5.3 Procedures p. 45
6.5.3.1 Procedure for network slice quota information from OAM p. 45
6.5.3.2 Procedure for collection the information of the current number of PDU Sessions established in a network slice p. 46
6.5.3.2.1 Procedure for collection the information of the current number of PDU Sessions established in a network slice from SMF p. 46
6.5.3.2.2 Procedure for collection the information of the current number of PDU Sessions successfully established in a network slice quota from OAM p. 46
6.5.3.3 Procedure for subscribing and notifying the event of network slice quota reached status p. 47
6.5.3.4 Procedure for requesting for the network slice quota reached status p. 48
6.5.3.5 Procedure for network slice quota checking in non-roaming or local breakout roaming case p. 48
6.5.3.6 Procedure for network slice quota checking in home-routed roaming case p. 49
6.5.4 Impacts on services, entities and interfaces p. 50
6.6 Solution #6: PCF-based counting of PDU Sessions in a Network Slice p. 50
6.6.1 Introduction p. 50
6.6.2 High-level Description p. 50
6.6.3 Procedures p. 51
6.6.3.1 General p. 51
6.6.3.2 PDU Session Establishment with S-NSSAIs subject to Quota management/capping p. 52
6.6.3.3 PDU Session Release with S-NSSAIs subject to Quota management/capping p. 54
6.6.3.4 V-PCF to H-PCF interaction for S-NSSAIs of HPLMN subject to Quota management/capping p. 55
6.6.3.5 PCF - Primary PCF interactions when multiple PCFs are used in a Network Slice p. 56
6.6.3.6 Quota management during 5GS to EPS handover p. 57
6.6.3.7 Quota management during EPS to 5GS handover p. 58
6.6.4 Impacts on services, entities and interfaces p. 59
6.7 Solution #7: Support of Network Slice SLA for Maximum Number of PDU sessions parameter p. 59
6.7.1 Introduction p. 59
6.7.2 High-level Description p. 59
6.7.3 Procedures p. 60
6.7.3.1 General p. 60
6.7.3.2 PDU Session establishment and Slice SLA Quota Update p. 62
6.7.3.3 PDU Session Release and Slice SLA Quota Update p. 63
6.7.3.4 Controlling (re)-distribution of local quota of Slice SLA attributes p. 64
6.7.3.5 Controlling quota of Slice SLA attribute of Maximum Number of PDU sessions at Roaming p. 64
6.7.4 Impacts on services, entities and interfaces p. 64
6.8 Solution #8: AMF and O&M based solution p. 65
6.8.1 Introduction p. 65
6.8.2 High-level Description p. 65
6.8.3 Procedures p. 65
6.8.3.1 Network Slice orchestration p. 65
6.8.3.2 Procedure for counting number of UEs registered to a Network Slice p. 66
6.8.3.3 Procedure for counting number of PDU Sessions per Network Slice p. 67
6.8.3.4 Procedure for handling counting at mobility between AMF Sets p. 68
6.8.4 Impacts on services, entities and interfaces p. 70
6.9 Solution #9: Monitoring multiple quotas of number of UEs/PDU Sessions per S-NSSAI at NWDAF p. 70
6.9.1 Introduction p. 70
6.9.2 High-level Description p. 71
6.9.3 Procedures p. 71
6.9.3.1 Monitoring a Network Slice attribute at NWDAF for roaming and non-roaming UEs p. 71
6.9.3.2 AF requests monitoring a Network Slice attribute and determines actions upon exceeded quota p. 73
6.9.3.3 Applying adaptive charging if a quota for a Network Slice attribute is reached p. 75
6.9.4 Impacts on services, entities and interfaces p. 77
6.9.5 Evaluation p. 77
6.10 Solution #10: Max number of PDU Sessions per Network Slice control via NSQ function p. 77
6.10.1 Introduction p. 77
6.10.2 High-level Description p. 77
6.10.3 Procedures p. 78
6.10.3.1 Max number of PDU Sessions per Network Slice control at PDU Session Establishment p. 78
6.10.3.2 Max number of PDU Sessions per Network Slice control at PDU Session Release p. 79
6.10.3.3 Max number of PDU Sessions per Network Slice control in roaming. p. 79
6.10.4 Impacts on services, entities and interfaces p. 79
6.10.5 Evaluation p. 79
