Content for TR 23.882 Word version: 8.0.0
7.10 Key issue - IP connectivity with multiple PDNs
7.11 Key Issue - Functions in the evolved packet core
7.12 Key Issue QoS concepts
7.13 Key Issue Network Attachment
7.14 Key Issue Paging and C-plane establishment
7.15 Key Issue: Intra LTE-Access-System inter MME/UPE handover in the active mode
7.16 Key Issue - Network Redundancy and Load Sharing
7.17 Key Issue Network Sharing
7.18 Key Issue Intra-LTE-Access Mobility Support for Ues in LTE_ACTIVE
7.19 Key Issue - Service continuity at domain and RAT change for TS 11, TS 12, … and equivalent PS service
7.20 Key Issue - SAE Identities
7.21 Key Issue - Network Discovery and Selection
7.22 Key Issue - Voice service continuity between cdma2000 1xRTT Revision A and E-UTRA
7.10 Key issue - IP connectivity with multiple PDNs p. 65
7.10.1 Description of Key Issue - IP connectivity with multiple PDNs p. 65
7.10.2 Solution for Key Issue IP connectivity with multiple PDNs p. 66
7.10.2.1 Working Assumptions p. 66
7.10.2.2 Solution alternatives p. 67
7.10.2.3 Alternative solutions for the use cases p. 69
7.10.3 Impact on the baseline CN Architecture p. 69
7.10.4 Impact on the baseline RAN Architecture p. 70
7.10.5 Impact on terminals used in the existing architecture p. 70
7.11 Key Issue - Functions in the evolved packet core p. 70
7.11.1 Description of Key Issue - Functions in the evolved packet core p. 70
7.11.2 Solution for Key Issue - grouping of the functions p. 71
7.11.2.1 Allocation of evolved packet core functions to UPE, MME and Inter-AS Anchor p. 71
7.11.2.2 Alternative 1 p. 72
7.11.2.3 Alternative 2 p. 72
7.11.2.4 Alternative … p. 72
7.11.3 Impact on the baseline CN Architecture p. 72
7.11.4 Impact on the baseline RAN Architecture p. 72
7.11.5 Impact on terminals used in the existing architecture p. 72
7.12 Key Issue QoS concepts p. 72
7.12.1 Terminology p. 72
7.12.2 Description of Key Issue QoS concepts p. 73
7.12.3 QoS Concept p. 73
7.12.4 SAE Bearer Service Architecture p. 74
7.12.5 Granularity of QoS Control p. 75
7.12.6 The QoS Profile of the SAE Bearer p. 75
7.12.7 Label Usage Principles p. 76
7.12.8 Aggregate Maximum Bit Rate p. 77
7.12.9 Resource Establishment and QoS Signalling p. 77
7.12.10 Identified Open Issues p. 79
7.12.11 Impact on the baseline CN Architecture p. 79
7.12.12 Impact on the baseline RAN Architecture p. 79
7.12.13 Impact on terminals used in the existing architecture p. 79
7.13 Key Issue Network Attachment p. 79
7.13.1 Description of Network Attachment p. 79
7.13.2 Solution for Key Issue Network Attachment p. 79
7.13.3 Impact on the baseline CN Architecture p. 82
7.13.4 Impact on the baseline RAN Architecture p. 82
7.13.5 Impact on terminals used in the existing architecture p. 82
7.14 Key Issue Paging and C-plane establishment p. 83
7.14.1 Description of Key Issue Paging and Evolved RAN C-plane establishment p. 83
7.14.2 Solution for Key Issue Paging and Evolved RAN C-plane establishment p. 83
7.14.3 Impact on the baseline CN Architecture p. 85
7.14.4 Impact on the baseline RAN Architecture p. 85
7.14.5 Impact on terminals used in the existing architecture p. 85
7.15 Key Issue: Intra LTE-Access-System inter MME/UPE handover in the active mode p. 85
7.15.1 Description of Key Issue p. 85
7.15.2 Solution for key issue p. 85
7.15.2.1 Alternative 1 p. 85
7.15.2.1.1 Description p. 85
7.15.2.1.2 Impact on the baseline CN Architecture p. 87
7.15.2.1.3 Impact on the baseline RAN Architecture p. 87
7.15.2.1.4 Impact on terminals used in the existing architecture p. 87
7.15.2.2 Alternative 2 p. 88
7.15.2.2.1 Description p. 88
7.15.2.x Alternative x p. 90
7.16 Key Issue - Network Redundancy and Load Sharing p. 90
7.16.1 Description of Key Issue - Network Redundancy and Load-sharing p. 90
7.16.2 General Solutions for key issue - Network Redundancy and Load-sharing p. 90
7.16.3 S1-flex Concept p. 91
7.17 Key Issue Network Sharing p. 91
7.17.1 Description of Network Sharing p. 91
7.17.2 Solution for Key Issue Network Sharing p. 91
7.17.2.1 General p. 91
7.17.2.2 S1-flex configuration p. 92
7.17.2.3 Broadcast system information for an SAE/LTE network p. 92
7.17.2.4 Network selection in an SAE/LTE network p. 92
7.17.2.5 Assignment of Operator and MME/UPE node p. 92
7.17.2.6 Accounting in RAN p. 93
7.17.3 Impact on the baseline CN Architecture p. 93
7.17.4 Impact on the baseline RAN Architecture p. 93
7.17.5 Impact on terminals used in the existing architecture p. 93
7.18 Key Issue Intra-LTE-Access Mobility Support for Ues in LTE_ACTIVE p. 93
7.18.1 Description of Key Issue Intra-LTE-Access Mobility Support for Ues in LTE_ACTIVE p. 93
7.18.2 Solution for key issue Intra-LTE-Access Mobility Support for Ues in LTE_ACTIVE p. 93
7.18.3 Impact on the baseline CN Architecture p. 95
7.18.4 Impact on the baseline RAN Architecture p. 95
7.18.5 Impact on terminals used in the existing architecture p. 95
7.19 Key Issue - Service continuity at domain and RAT change for TS 11, TS 12, … and equivalent PS service p. 95
7.19.1 Voice call continuity between IMS over SAE/LTE access and CS domain p. 95
7.19.1.1 Description of key issue Voice call continuity between IMS over SAE/LTE access and CS domain p. 95
7.19.1.2 General aspects p. 96
7.19.1.3 Alternative solution A - Combinational VCC p. 96
7.19.1.3.1 Description p. 96
7.19.1.3.2 Impact on the baseline CN Architecture p. 97
7.19.1.3.3 Impact on the baseline RAN Architecture p. 97
7.19.1.3.4 Impact on terminals used in the existing architecture p. 97
7.19.1.4 Alternative solution B p. 97
7.19.1.4.1 Description p. 97
7.19.1.4.2 Impact on the baseline CN Architecture p. 98
7.19.1.4.3 Impact on the baseline RAN Architecture p. 98
7.19.1.4.4 Impact on terminals used in the existing architecture p. 98
7.19.1.5 Alternative solution C - CreDT p. 98
7.19.1.5.1 Description p. 98
7.19.1.5.2 Impact on the baseline CN Architecture p. 99
7.19.1.5.3 Impact on the baseline RAN Architecture p. 99
7.19.1.5.4 Impact on terminals used in the existing architecture p. 99
7.19.1.6 Alternative solution D - "Inter-MSC Handover" solution p. 99
7.19.1.6.1 Description p. 99
7.19.1.6.2 Impact on the baseline CN Architecture p. 99
7.19.1.6.3 Impact on the baseline RAN Architecture p. 99
7.19.1.6.4 Impact on terminals used in the existing architecture p. 99
7.19.1.6a Alternative D-1 - Inter-MSC Handover with anchoring at the VCC Application p. 100
7.19.1.6a.1 Description p. 100
7.19.1.6a.2 LTE ⇒ 2G CS voice continuity with CS Proxy reference architecture p. 100
7.19.1.6a.2a Optimized LTE ⇒ 2G CS voice continuity call flow p. 102
7.19.1.6a.3 2G CS ⇒ LTE voice continuity call flow p. 104
7.19.1.6a.3a Optimized 2G CS ⇒ E-UTRAN voice continuity call flow p. 107
7.19.1.6b Alternative D-2 - LTE-VMSC Anchor Solution p. 109
7.19.1.6b.1 Description of LTE to UMTS/GERAN CS handover p. 109
7.19.1.6b.2 Information flows p. 109
7.19.1.6b.3 Subsequent handovers from 2G/3G back to IMS/LTE p. 113
7.19.1.6b.4 Advantages of the solution p. 114
7.19.1.7 Alternative E - IMS Anchored Voice Continuity p. 114
7.19.1.7.1 Alternative E with tunnelling option p. 114
7.19.1.7.2 Alternative E without tunnelling option p. 118
7.19.1.7.3 2G/3G CS voice to LTE VoIP voice continuity p. 122
7.19.1.8 Alternative F - Inter-MSC Handover with IMS Centralised Services p. 124
7.19.1.8.0 General Concept p. 124
7.19.1.8.1 Alternative F-1 p. 124
7.19.1.8.2 Alternative F-2 p. 131
7.19.1.8.3 Impact on the baseline CN Architecture p. 134
7.19.1.8.4 Impact on the baseline RAN Architecture p. 134
7.19.1.8.5 Impact on terminals used in the existing architecture p. 134
7.19.1.9 Alternative D/F p. 134
7.19.1.9.1 Description p. 134
7.19.1.9.2 Call flows for Handovers of calls initiated in LTE p. 135
7.19.1.9.3 Service Model p. 143
7.19.1.9.4 UE and S-IWF CS state synchronization p. 143
7.19.1.9.5 VDN allocation for S-IWF p. 143
7.19.1.9.6 Interworking with non VCC capable IMS network p. 144
7.19.1.9.7 Interworking with non VCC capable UE p. 144
7.19.1.9.8 ICS and Distributed Service model selection p. 144
7.19.1.9.9 Advantages of the solution p. 144
7.19.1.10 Partial Conclusions on Voice call continuity between IMS over SAE/LTE access and CS domain p. 144
7.19.1.11 Evaluation of the remaining options p. 145
7.19.1.12 Conclusions on Voice call continuity between IMS over SAE/LTE access and CS domain over GERAN/UTRAN access p. 148
7.19.2 Handover of MSC controlled voice calls between SAE/LTE access and CS access p. 148
7.20 Key Issue - SAE Identities p. 150
7.21 Key Issue - Network Discovery and Selection p. 153
7.21.1 Description of Key Issue Network Discovery and Selection p. 153
7.21.2 Solutions for Key Issue Network Discovery and Selection p. 154
7.22 Key Issue - Voice service continuity between cdma2000 1xRTT Revision A and E-UTRA p. 154
