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TR 23.852
Study on
S2a Mobility based on GTP
and WLAN Access to the EPC Network

3GPP‑Page   fToC↓   Partial Content →
V12.0.0 (Wzip)  2013/09  157 p.
Rapporteur:
Mr. Zhu, Chunhui
ZTE Corporation

full Table of Contents for  TR 23.852  Word version:  12.0.0

each clause number in 'red' refers to the equivalent title in the Partial Content
Here   Top
1Scope  p. 8
2References  p. 8
3Definitions and abbreviations  p. 9
3.1Definitions  p. 9
3.2Abbreviations  p. 9
4Scenarios  p. 10
5Architectural assumptions  p. 11
5.1Architectural assumptions for GTP based S2a  p. 11
5.2Architectural assumptions for WLAN access to EPC through S2a  p. 11
5.2.1Assumptions for solutions with no Impact to the UE  p. 11
6Solutions for GTP based S2a  p. 12
6.1Solution 1  p. 12
6.1.1Architecture  p. 12
6.1.2Functional description  p. 14
6.1.2.1Bearer model for a PDN connection  p. 14
6.1.3Information flows  p. 15
6.1.3.1Initial Attach Procedure with GTP on S2a and Anchoring in PDN GW  p. 15
6.1.3.2Detach and PDN Disconnection with GTP on S2a  p. 17
6.1.3.2.1UE/Trusted Non-3GPP IP Access Network Initiated Detach and UE/Trusted Non-3GPP IP Access requested PDN Disconnection Procedure with GTP on S2a  p. 17
6.1.3.2.2HSS/AAA Initiated Detach Procedure with GTP on S2a  p. 18
6.1.3.3UE-initiated Connectivity to Additional PDN with GTP on S2a  p. 18
6.1.3.4Dedicated bearer activation with GTP on S2a  p. 20
6.1.3.5Network-initiated S2a bearer modification with GTP on S2a  p. 21
6.1.3.5.1PDN GW Initiated Bearer Modification  p. 21
6.1.3.5.2HSS Initiated Subscribed QoS Modification  p. 22
6.1.3.6PDN GW initiated Resource Allocation Deactivation with GTP on S2a  p. 23
6.1.3.7Handovers without Optimizations Between 3GPP Accesses and Non-3GPP IP Accesses with S2a GTP  p. 24
6.1.3.7.1Handover from a trusted non-3GPP IP access with S2a GTP to 3GPP Access  p. 24
6.1.3.7.2Handover from 3GPP Access to a trusted non-3GPP IP access with S2a GTP  p. 25
7Additional considerations for WLAN access to EPC through S2a for Phase 1  p. 27
7.1Solutions without UE Impact  p. 27
7.1.0General  p. 27
7.1.1Solution 1  p. 27
7.1.1.1Reference model  p. 27
7.1.1.2Initial Attach Procedure with GTP on S2a and Anchoring in PDN GW  p. 30
7.1.1.3Without-UE-impact procedures except Initial Attach  p. 32
7.1.1.4SaMOG deployment  p. 32
7.1.1.5PMIP based S2a considerations  p. 32
7.1.2Solution 2  p. 33
7.1.2.0General  p. 33
7.1.2.1Reference Model  p. 33
7.1.2.2Network elements  p. 35
7.1.2.2.1UE  p. 35
7.1.2.2.2Trusted WLAN AAA Proxy  p. 35
7.1.2.2.3Trusted WLAN Access Gateway  p. 35
7.1.2.3Reference Points  p. 36
7.1.2.3.1Ta reference point  p. 36
7.1.2.3.2Tg reference point  p. 36
7.1.2.3.3Tn reference point  p. 36
7.1.2.3.4Tw reference point  p. 37
7.1.2.3.5Tu reference point  p. 37
7.1.2.4Procedures  p. 37
7.1.2.4.1Initial Attach to Trusted Non-3GPP WLAN Access procedure  p. 38
7.1.2.4.2UE/Trusted Non-3GPP WLAN Access Network Initiated Detach procedure  p. 39
7.1.2.4.3HSS/AAA Initiated Detach procedure  p. 40
7.1.2.4.4Other procedures  p. 40
7.1.3Handovers with or without TNSP/TWAG relocation with unmodified UEs  p. 40
8Additional considerations for WLAN access to EPC through S2a for Phase 2  p. 40
8.1Requirements  p. 40
8.1AKey issues  p. 41
8.2Solutions  p. 42
8.2.1Solution 1: Tunnelled approach with dedicated UE-TWAG control protocol  p. 42
8.2.1.1Functional Description  p. 42
8.2.1.1.1Overview  p. 42
8.2.1.1.2User plane  p. 42
8.2.1.1.3Control plane  p. 44
8.2.1.1.4Protocol Stacks  p. 46
8.2.1.2Procedures  p. 46
8.2.1.2.1Initial Attach in WLAN on S2a  p. 46
8.2.1.2.2Initial Attach in single-connection scenario in WLAN on S2a (continuation)  p. 47
8.2.1.2.3Initial Attach in multi-connection scenario in WLAN on S2a (continuation)  p. 48
8.2.1.2.4UE-Initiated Connectivity to PDN in WLAN on S2a  p. 48
8.2.1.2.5Handover procedure in single-connection scenario from 3GPP access to WLAN on S2a  p. 50
8.2.1.2.6Handover procedure in multi-connection scenario from 3GPP access to WLAN on S2a  p. 51
8.2.1.2.7Handover procedure from WLAN on S2a to 3GPP access  p. 54
8.2.1.2.8Detach and PDN disconnection in WLAN on S2a  p. 55
8.2.1.2.9PDN GW initiated Resource Allocation Deactivation  p. 56
8.2.1.3Impacts on existing nodes or functionality  p. 56
8.2.1.4Evaluation  p. 56
8.2.2Solution 2: Layer 2 solution based on Stateful Address Configuration of Per-PDN Connection/NSWO Point-to-Point Link Multiplexed at Layer 2  p. 58
8.2.2.1Functional Description  p. 58
8.2.2.1.1User Plane Multiplexing for Per-PDN Connection / NSWO Point-to-Point Link  p. 58
8.2.2.1.2Initial Attach in WLAN  p. 60
8.2.2.1.3UE Requested PDN or NSWO connectivity  p. 61
8.2.2.1.4UE Requested PDN or NSWO disconnection  p. 63
8.2.2.1.5HSS/AAA Initiated PDN or NSWO Disconnection procedure in WLAN  p. 65
8.2.2.1.6HSS/AAA Initiated Detach procedure in WLAN  p. 65
8.2.2.1.7Handover from 3GPP Access to Trusted WLAN Access  p. 66
8.2.2.1.8Handover from Trusted WLAN Access to 3GPP Access  p. 67
8.2.2.2Impacts on existing nodes or functionality  p. 67
8.2.2.3Evaluation  p. 68
8.2.3Solution 3: Stateful DHCP-based Solution  p. 69
8.2.3.1Functional Description  p. 69
8.2.3.1.1Functional Overview and Overall System Impacts  p. 69
8.2.3.1.2Control Plane Management  p. 70
8.2.3.1.3User plane management  p. 71
8.2.3.1.4Protocol stack  p. 74
8.2.3.1.5IP addressing support for SaMOG phase-2  p. 75
8.2.3.2Procedures  p. 76
8.2.3.2.1Initial Attach in WLAN on S2a  p. 77
8.2.3.2.2UE-initiated Connectivity to Additional PDN  p. 79
8.2.3.2.3Detach and PDN disconnection in WLAN on S2a  p. 82
8.2.3.2.3.2Detach and PDN disconnection in WLAN on PMIP S2a  p. 86
8.2.3.2.4PDN GW initiated Resource Allocation Deactivation in WLAN on S2a  p. 88
8.2.3.2.5Dedicated bearer activation in WLAN on GTP S2a  p. 89
8.2.3.2.6Network-initiated bearer modification in WLAN on GTP S2a  p. 89
8.2.3.2.7Handover from 3GPP Access to Trusted WLAN Access  p. 90
8.2.3.3Impacts on existing nodes or functionality  p. 93
8.2.3.4Evaluation  p. 93
8.2.4Solution 4  p. 94
8.2.4.1Functional Description  p. 94
8.2.4.1.1P2P link  p. 94
8.2.5Solution 5: Associating APN/PDN with Virtual IP Interface  p. 94
8.2.5.1Functional Description  p. 94
8.2.5.1.1General  p. 94
8.2.5.2Procedures  p. 96
8.2.5.2.2Connection Establishment Procedure  p. 96
8.2.5.2.3UE Initiated Disconnection Procedure  p. 99
8.2.5.2.4HSS/AAA Initiated Disconnection Procedure  p. 100
8.2.5.2.5Handover procedure between 3GPP access and WLAN on GTP S2a  p. 102
8.2.5.3Impacts on existing nodes or functionality  p. 103
8.2.5.4Evaluation  p. 103
8.2.6Solution 6: X  p. 103
8.2.7Solution 7: PPP over Ethernet (PPPoE)  p. 103
8.2.7.1Functional Description  p. 103
8.2.7.1.1Overview  p. 103
8.2.7.2Procedures  p. 105
8.2.7.2.1Initial or Handover Attach over TWAN  p. 105
8.2.7.2.2UE-Requested PDN Connection Establishment  p. 107
8.2.7.2.3UE-Requested and Network-Requested PDN Connection Release  p. 110
8.2.7.2.4Handover from 3GPP access to WLAN  p. 110
8.2.7.2.5Handover from TWAN to 3GPP access  p. 111
8.2.7.3Impacts on existing nodes or functionality  p. 111
8.2.7.4Evaluation  p. 111
8.2.8Solution 8: Solution using new 3GPP specific LLC/SNAP header settings  p. 113
8.2.8.1Functional Description  p. 113
8.2.8.1.1General  p. 113
8.2.8.1.2Protocol stack  p. 114
8.2.8.1.3Protocol header  p. 114
8.2.8.2Procedures  p. 115
8.2.8.3Impacts on existing nodes or functionality  p. 118
8.2.8.4Evaluation  p. 118
8.2.9Solution 9: EAP based signalling solution  p. 119
8.2.9.1Functional Description  p. 119
8.2.9.1.1General  p. 119
8.2.9.1.2Protocol stack  p. 120
8.2.9.1.3Signalling information from UE to the network  p. 121
8.2.9.1.4Signalling information from the network to the UE  p. 122
8.2.9.2Procedures  p. 122
8.2.9.2.1Initial Attach in WLAN on S2a  p. 122
8.2.9.2.2UE-Initiated Connectivity to Additional PDN in WLAN on S2a  p. 123
8.2.9.2.3Handover procedure between 3GPP access and WLAN on S2a  p. 124
8.2.9.2.4PDN GW initiated Resource Allocation Deactivation  p. 125
8.2.9.2.5TWAN requested PDN Disconnection Procedures  p. 125
8.2.9.2.6UE requested PDN Disconnection Procedures  p. 126
8.2.9.2.7Detach Procedures  p. 127
8.2.9.3Impacts on existing nodes or functionality  p. 127
8.2.9.4Evaluation  p. 128
8.2.10Solution 10 : WCS Solution  p. 128
8.2.10.1Functional Description  p. 128
8.2.10.1.1Overview  p. 128
8.2.10.1.2User plane  p. 128
8.2.10.1.3Control plane  p. 128
8.2.10.1.4Protocol Stacks  p. 131
8.2.10.2Procedures  p. 131
8.2.10.2.1Initial Attach procedure  p. 131
8.2.10.2.2UE-initiated Connectivity to Additional PDN  p. 133
8.2.10.2.3Handover procedure in multi-connection scenario from 3GPP access to WLAN on S2a  p. 134
8.2.10.2.4Handover procedure in multi-connection scenario from WLAN on S2a to 3GPP access  p. 135
8.2.10.2.5Handover procedure from WLAN on S2a to 3GPP access  p. 136
8.2.10.2.6UE/TWAN Requested PDN disconnection in WLAN on S2a  p. 137
8.2.10.2.7UE initiated Detach in WLAN on S2a  p. 138
8.2.10.2.8HSS/AAA Initiated Detach Procedure in WLAN  p. 139
8.2.10.2.9PDN GW initiated Resource Allocation Deactivation  p. 140
8.2.10.3Impacts on existing nodes or functionality  p. 140
8.2.10.4Evaluation  p. 140
8.2.11Solution 11 - Two scenario approach using DHCPv4 and Stateless DHCPv6 and a VMAC u-plane  p. 141
8.2.11.1Functional Description  p. 141
8.2.11.1.1Overview  p. 141
8.2.11.1.2User plane  p. 142
8.2.11.1.3Control plane  p. 142
8.2.11.2Procedures  p. 142
8.2.11.2.1Initial Attach in WLAN on S2a  p. 143
8.2.11.2.2Initial Attach in WLAN on S2a with hand-over  p. 144
8.2.11.2.3UE-Initiated Connectivity to PDN / NSWO in WLAN on S2a  p. 145
8.2.11.2.4Handover procedure for additional PDN connections from 3GPP access to WLAN on S2a  p. 147
8.2.11.2.5Handover procedure from WLAN on S2a to 3GPP access  p. 148
8.2.11.2.6Detach and PDN disconnection in WLAN on S2a  p. 148
8.2.11.3Impacts on existing nodes or functionality  p. 150
8.2.11.3.1Single PDN connection scenario  p. 150
8.2.11.3.2Multiple PDN connection scenario  p. 150
8.2.11.4Evaluation  p. 151
8.3Evaluation  p. 152
8.3.1List of SaMOG Phase 2 Solutions  p. 152
9Conclusion  p. 152
9.1Conclusion on SaMOG Phase 1  p. 152
9.1.1Conclusion on attach trigger solution  p. 153
9.2Conclusion on SaMOG Phase 2  p. 153
9.2.1Partial conclusions  p. 153
9.2.2Final conclusions  p. 153
9.2.2.1Support of single-PDN and multi-PDN UEs  p. 153
9.2.2.2User-plane conclusion  p. 154
9.2.2.3Control-plane conclusion  p. 154
AExample of WLAN integrated with Femto  p. 155
$Change history  p. 156

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