Content for TR 23.761 Word version: 17.0.0
5 Key Issues p. 12
5.1 Key Issue 1: Handling of Mobile Terminated service with Multi-USIM device p. 12
5.1.1 Description p. 12
5.2 Key Issue 2: Enabling Paging Reception for Multi-USIM Device p. 12
5.2.1 Description p. 12
5.3 Key Issue 3: Coordinated leaving for Multi-USIM device p. 13
5.3.1 Description p. 13
5.4 Key Issue 4: Emergency handling of MUSIM UE p. 13
6 Solutions p. 14
6.0 Mapping Solutions to Key Issues p. 14
6.1 Solution #1: Handling of MT service with Paging Cause p. 14
6.1.1 Introduction p. 14
6.1.2 Functional Description p. 14
6.1.3 Procedures p. 16
6.1.3.1 Handling of MT service with Paging Cause for UE in CM_Idle in 5GS p. 16
6.1.3.2 Handling of MT service with Paging Cause in RRC_Inactive mode p. 17
6.1.3.3 Handling of MT service with Paging Cause in EPS p. 17
6.1.3.4 Paging Cause values p. 18
6.1.4 Impacts on services, entities and interfaces p. 18
6.2 Solution #2: Negotiated Short Period Absence p. 20
6.2.1 Introduction p. 20
6.2.2 Functional Description p. 20
6.2.3 Procedures p. 21
6.2.4 Impacts on services, entities and interfaces p. 22
6.3 Solution #3: Busy indication as a paging response p. 22
6.3.1 Introduction p. 22
6.3.2 Functional Description p. 22
6.3.3 Procedures p. 23
6.3.4 Impacts on services, entities and interfaces p. 24
6.4 Solution #4: Local leaving p. 25
6.4.1 Introduction p. 25
6.4.2 Functional Description p. 25
6.4.3 Procedures p. 26
6.4.3.1 Procedure for local release based on the UE leaving indicated via NAS message p. 26
6.4.3.2 Procedure for Local leaving negotiation with RAN p. 27
6.4.3.3 Procedure for local leaving indicated via RRC message p. 28
6.4.4 Impacts on services, entities and interfaces p. 28
6.5 Solution #5: Graceful leaving and resumption solutions p. 29
6.5.1 Introduction p. 29
6.5.2 Functional Description p. 29
6.5.3 Procedures p. 30
6.5.3.0 General p. 30
6.5.3.1 NAS Leaving procedure p. 30
6.5.3.2 NAS Resumption procedure p. 32
6.5.3.3 RRC leaving procedure p. 34
6.5.3.4 RRC Resumption procedure p. 36
6.5.4 Impacts on services, entities and interfaces p. 37
6.6 Solution #6: UE leave and return p. 37
6.6.1 Introduction p. 37
6.6.2 Functional Description p. 38
6.6.3 Procedures p. 38
6.6.4 Impacts on services, entities and interfaces p. 39
6.7 Solution #7: Push Notification p. 40
6.7.1 Introduction p. 40
6.7.2 Functional Description p. 40
6.7.3 Procedures p. 41
6.7.4 Impacts on services, entities and interfaces p. 45
6.8 Solution #8: MT Service Notification through N3IWF p. 45
6.8.1 Introduction p. 45
6.8.2 Functional Description p. 45
6.8.3 Procedures p. 47
6.8.4 Impacts on services, entities and interfaces p. 48
6.9 Solution #9: Handling of MT IMS voice service with different Paging Cause p. 49
6.9.1 Introduction p. 49
6.9.2 Functional Description p. 49
6.9.3 Procedures p. 49
6.9.4 Impacts on services, entities and interfaces p. 49
6.10 Solution #10: Network based paging filtering p. 50
6.10.1 Introduction p. 50
6.10.2 Functional Description p. 50
6.10.3 Procedures p. 51
6.10.3.1 CM-IDLE in 5GS p. 51
6.10.3.2 RRC-Inactive in 5GS p. 52
6.10.3.4 Paging delivery in EPS p. 52
6.10.4 Impacts on services, entities and interfaces p. 52
6.11 Solution #11: Operator-defined upper bound timer for paging response p. 53
6.11.1 Introduction p. 53
6.11.2 Functional Description p. 53
6.11.3 Procedures p. 53
6.11.4 Impacts on services, entities and interfaces p. 55
6.12 Solution #12: Push Notification via SMS p. 56
6.12.1 Introduction p. 56
6.12.2 Functional Description p. 56
6.12.3 Procedures p. 58
6.12.3.1 5GS Procedure p. 58
6.12.3.2 EPS Procedure p. 59
6.12.4 Impacts on services, entities and interfaces p. 60
6.13 Solution #13: MT service via ePDG/N3IWF p. 60
6.13.1 Introduction p. 60
6.13.2 Functional Description p. 61
6.13.3 Procedures p. 61
6.13.4 Impacts on services, entities and interfaces p. 64
6.14 Solution #14: Paging collision avoidance by changing NAS parameters p. 64
6.14.1 Introduction p. 64
6.14.2 Functional Description p. 64
6.14.3 Procedures p. 66
6.14.4 Impacts on services, entities and interfaces p. 66
6.15 Solution #15: Paging collision avoidance by using Alternative UE_ID in paging procedure. p. 67
6.15.1 Introduction p. 67
6.15.2 Functional Description p. 67
6.15.3 Procedures p. 69
6.15.3.1 Registration including Alternative UE_ID p. 69
6.15.3.2 Paging with Alternative UE_ID p. 70
6.15.4 Impacts on services, entities and interfaces p. 70
6.16 Solution #16: Resolving paging occasion conflict using offset to the IMSI/5G-S-TMSI p. 71
6.16.1 Introduction p. 71
6.16.2 Functional Description p. 71
6.16.3 Procedures p. 72
6.16.4 Impacts on services, entities and interfaces p. 73
6.17 Solution #17: Resolving paging conflict using MUSIM Assistance Information. p. 74
6.17.1 Introduction p. 74
6.17.2 Functional Description p. 74
6.17.3 Procedures p. 75
6.17.3.1 Providing MUSIM assistance information to the CN p. 75
6.17.3.2 Paging p. 76
6.17.3.3 Stopping paging on one PLMN p. 77
6.17.3.4 Coordinated leaving using the MUSIM assistance information p. 78
6.17.4 Impacts on services, entities and interfaces p. 79
6.18 Solution #18: Sending paging on consecutive POs for Multi-USIM UE p. 79
6.18.1 Introduction p. 79
6.18.2 Functional Description p. 79
6.18.3 Procedures p. 80
6.18.4 Impacts on services, entities and interfaces p. 80
6.19 Solution #19: UE solution to address overlapping PO p. 80
6.19.1 Introduction p. 80
6.19.2 Functional Description p. 80
6.19.3 Procedures p. 80
6.19.4 Impacts on services, entities and interfaces p. 81
6.20 Solution #20: Triggering MRU upon PO collision detection p. 81
6.20.1 Introduction p. 81
6.20.2 Functional Description p. 81
6.20.3 Procedures p. 81
6.20.4 Impacts on services, entities and interfaces p. 82
6.21 Solution #21: Scheduling gap for Multi-SIM UE p. 82
6.21.1 Introduction p. 82
6.21.2 Functional Description p. 82
6.21.3 Procedures p. 83
6.21.4 Impacts on services, entities and interfaces p. 83
6.22 Solution #22: AS-triggered coordinated leaving p. 83
6.22.1 Introduction p. 83
6.22.2 Functional Description p. 83
6.22.3 Procedures p. 83
6.22.4 Impacts on services, entities and interfaces p. 83
6.23 Solution #23: N3GPP for MUSIM Service Concurrency 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 existing entities and interfaces p. 87
6.24 Solution #24: Procedure for providing paging cause to the UE when more than one USIM of the UE are registered with same PLMN p. 87
6.24.1 Introduction p. 87
6.24.2 Functional Description p. 87
6.24.3 Procedures p. 88
6.24.3.1 Procedure for enhancing AMF's knowledge of two USIM's belong to same UE p. 88
6.24.3.2 Procedure for providing paging cause in CM_IDLE state for USIM-1 when USIM-2 is in CM_CONNECTED state p. 89
6.24.4 Impacts on existing entities and interfaces p. 89
6.25 Solution #25: Using Non-3GPP access to deliver NAS Notification message p. 90
6.25.1 Introduction p. 90
6.25.2 Functional Description p. 90
6.25.3 Procedures p. 90
6.25.4 Impacts on existing entities and interfaces p. 91
6.26 Solution #26: MT service delivery when multiple USIMs are registered in the same serving PLMN p. 91
6.26.1 Introduction p. 91
6.26.2 Functional Description p. 91
6.26.3 Procedures p. 91
6.26.4 Impacts on existing entities and interfaces p. 94
6.27 Solution #27: User plane paging in a master PLMN p. 94
6.27.1 Introduction p. 94
6.27.2 Functional Description p. 94
6.27.3 Procedures p. 96
6.27.4 Impacts on existing entities and interfaces p. 97
6.28 Solution #28: "Important Service" paging cause p. 97
7 Evaluation p. 99
7.1 Evaluation of Solutions for Key Issue #1: Handling of Mobile Terminated service with Multi-USIM device p. 99
7.2 Evaluation of Solutions for Key Issue #2: Enabling Paging Reception for Multi-USIM Device p. 102
7.3 Evaluation of Solutions for Key Issue #3: Coordinated leaving for Multi-USIM device p. 104
8 Conclusions p. 106
8.1 Conclusions for Key Issue #1: Handling of Mobile Terminated service with Multi-USIM device p. 106
8.2 Conclusions for Key Issue #2: Enabling Paging Reception for Multi-USIM Device p. 106
8.3 Conclusions for Key Issue #3: Coordinated leaving for Multi-USIM device p. 107
$ Change history p. 108
