Content for TR 23.852 Word version: 12.0.0
5 Architectural assumptions
6 Solutions for GTP based S2a
7 Additional considerations for WLAN access to EPC through S2a for Phase 1
8 Additional considerations for WLAN access to EPC through S2a for Phase 2
9 Conclusion
A Example of WLAN integrated with Femto
$ Change history
5 Architectural assumptions p. 11
5.1 Architectural assumptions for GTP based S2a p. 11
5.2 Architectural assumptions for WLAN access to EPC through S2a p. 11
6 Solutions for GTP based S2a p. 12
6.1 Solution 1 p. 12
6.1.1 Architecture p. 12
6.1.2 Functional description p. 14
6.1.3 Information flows p. 15
6.1.3.1 Initial Attach Procedure with GTP on S2a and Anchoring in PDN GW p. 15
6.1.3.2 Detach and PDN Disconnection with GTP on S2a p. 17
6.1.3.2.1 UE/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
6.1.3.2.2 HSS/AAA Initiated Detach Procedure with GTP on S2a p. 18
6.1.3.3 UE-initiated Connectivity to Additional PDN with GTP on S2a p. 18
6.1.3.4 Dedicated bearer activation with GTP on S2a p. 20
6.1.3.5 Network-initiated S2a bearer modification with GTP on S2a p. 21
6.1.3.5.1 PDN GW Initiated Bearer Modification p. 21
6.1.3.5.2 HSS Initiated Subscribed QoS Modification p. 22
6.1.3.6 PDN GW initiated Resource Allocation Deactivation with GTP on S2a p. 23
6.1.3.7 Handovers without Optimizations Between 3GPP Accesses and Non-3GPP IP Accesses with S2a GTP p. 24
7 Additional considerations for WLAN access to EPC through S2a for Phase 1 p. 27
7.1 Solutions without UE Impact p. 27
7.1.0 General p. 27
7.1.1 Solution 1 p. 27
7.1.1.1 Reference model p. 27
7.1.1.2 Initial Attach Procedure with GTP on S2a and Anchoring in PDN GW p. 30
7.1.1.3 Without-UE-impact procedures except Initial Attach p. 32
7.1.1.4 SaMOG deployment p. 32
7.1.1.5 PMIP based S2a considerations p. 32
7.1.2 Solution 2 p. 33
7.1.2.0 General p. 33
7.1.2.1 Reference Model p. 33
7.1.2.2 Network elements p. 35
7.1.2.2.1 UE p. 35
7.1.2.2.2 Trusted WLAN AAA Proxy p. 35
7.1.2.2.3 Trusted WLAN Access Gateway p. 35
7.1.2.3 Reference Points p. 36
7.1.2.3.1 Ta reference point p. 36
7.1.2.3.2 Tg reference point p. 36
7.1.2.3.3 Tn reference point p. 36
7.1.2.3.4 Tw reference point p. 37
7.1.2.3.5 Tu reference point p. 37
7.1.2.4 Procedures p. 37
7.1.3 Handovers with or without TNSP/TWAG relocation with unmodified UEs p. 40
8 Additional considerations for WLAN access to EPC through S2a for Phase 2 p. 40
8.1 Requirements p. 40
8.1A Key issues p. 41
8.2 Solutions p. 42
8.2.1 Solution 1: Tunnelled approach with dedicated UE-TWAG control protocol p. 42
8.2.1.1 Functional Description p. 42
8.2.1.1.1 Overview p. 42
8.2.1.1.2 User plane p. 42
8.2.1.1.3 Control plane p. 44
8.2.1.1.4 Protocol Stacks p. 46
8.2.1.2 Procedures p. 46
8.2.1.2.1 Initial Attach in WLAN on S2a p. 46
8.2.1.2.2 Initial Attach in single-connection scenario in WLAN on S2a (continuation) p. 47
8.2.1.2.3 Initial Attach in multi-connection scenario in WLAN on S2a (continuation) p. 48
8.2.1.2.4 UE-Initiated Connectivity to PDN in WLAN on S2a p. 48
8.2.1.2.5 Handover procedure in single-connection scenario from 3GPP access to WLAN on S2a p. 50
8.2.1.2.6 Handover procedure in multi-connection scenario from 3GPP access to WLAN on S2a p. 51
8.2.1.2.7 Handover procedure from WLAN on S2a to 3GPP access p. 54
8.2.1.2.8 Detach and PDN disconnection in WLAN on S2a p. 55
8.2.1.2.9 PDN GW initiated Resource Allocation Deactivation p. 56
8.2.1.3 Impacts on existing nodes or functionality p. 56
8.2.1.4 Evaluation p. 56
8.2.2 Solution 2: Layer 2 solution based on Stateful Address Configuration of Per-PDN Connection/NSWO Point-to-Point Link Multiplexed at Layer 2 p. 58
8.2.2.1 Functional Description p. 58
8.2.2.1.1 User Plane Multiplexing for Per-PDN Connection / NSWO Point-to-Point Link p. 58
8.2.2.1.2 Initial Attach in WLAN p. 60
8.2.2.1.3 UE Requested PDN or NSWO connectivity p. 61
8.2.2.1.4 UE Requested PDN or NSWO disconnection p. 63
8.2.2.1.5 HSS/AAA Initiated PDN or NSWO Disconnection procedure in WLAN p. 65
8.2.2.1.6 HSS/AAA Initiated Detach procedure in WLAN p. 65
8.2.2.1.7 Handover from 3GPP Access to Trusted WLAN Access p. 66
8.2.2.1.8 Handover from Trusted WLAN Access to 3GPP Access p. 67
8.2.2.2 Impacts on existing nodes or functionality p. 67
8.2.2.3 Evaluation p. 68
8.2.3 Solution 3: Stateful DHCP-based Solution p. 69
8.2.3.1 Functional Description p. 69
8.2.3.1.1 Functional Overview and Overall System Impacts p. 69
8.2.3.1.2 Control Plane Management p. 70
8.2.3.1.3 User plane management p. 71
8.2.3.1.4 Protocol stack p. 74
8.2.3.1.5 IP addressing support for SaMOG phase-2 p. 75
8.2.3.2 Procedures p. 76
8.2.3.2.1 Initial Attach in WLAN on S2a p. 77
8.2.3.2.2 UE-initiated Connectivity to Additional PDN p. 79
8.2.3.2.3 Detach and PDN disconnection in WLAN on S2a p. 82
8.2.3.2.4 PDN GW initiated Resource Allocation Deactivation in WLAN on S2a p. 88
8.2.3.2.5 Dedicated bearer activation in WLAN on GTP S2a p. 89
8.2.3.2.6 Network-initiated bearer modification in WLAN on GTP S2a p. 89
8.2.3.2.7 Handover from 3GPP Access to Trusted WLAN Access p. 90
8.2.3.3 Impacts on existing nodes or functionality p. 93
8.2.3.4 Evaluation p. 93
8.2.4 Solution 4 p. 94
8.2.4.1 Functional Description p. 94
8.2.4.1.1 P2P link p. 94
8.2.5 Solution 5: Associating APN/PDN with Virtual IP Interface p. 94
8.2.5.1 Functional Description p. 94
8.2.5.1.1 General p. 94
8.2.5.2 Procedures p. 96
8.2.5.2.2 Connection Establishment Procedure p. 96
8.2.5.2.3 UE Initiated Disconnection Procedure p. 99
8.2.5.2.4 HSS/AAA Initiated Disconnection Procedure p. 100
8.2.5.2.5 Handover procedure between 3GPP access and WLAN on GTP S2a p. 102
8.2.5.3 Impacts on existing nodes or functionality p. 103
8.2.5.4 Evaluation p. 103
8.2.6 Solution 6: X p. 103
8.2.7 Solution 7: PPP over Ethernet (PPPoE) p. 103
8.2.7.1 Functional Description p. 103
8.2.7.1.1 Overview p. 103
8.2.7.2 Procedures p. 105
8.2.7.2.1 Initial or Handover Attach over TWAN p. 105
8.2.7.2.2 UE-Requested PDN Connection Establishment p. 107
8.2.7.2.3 UE-Requested and Network-Requested PDN Connection Release p. 110
8.2.7.2.4 Handover from 3GPP access to WLAN p. 110
8.2.7.2.5 Handover from TWAN to 3GPP access p. 111
8.2.7.3 Impacts on existing nodes or functionality p. 111
8.2.7.4 Evaluation p. 111
8.2.8 Solution 8: Solution using new 3GPP specific LLC/SNAP header settings p. 113
8.2.8.1 Functional Description p. 113
8.2.8.2 Procedures p. 115
8.2.8.3 Impacts on existing nodes or functionality p. 118
8.2.8.4 Evaluation p. 118
8.2.9 Solution 9: EAP based signalling solution p. 119
8.2.9.1 Functional Description p. 119
8.2.9.1.1 General p. 119
8.2.9.1.2 Protocol stack p. 120
8.2.9.1.3 Signalling information from UE to the network p. 121
8.2.9.1.4 Signalling information from the network to the UE p. 122
8.2.9.2 Procedures p. 122
8.2.9.2.1 Initial Attach in WLAN on S2a p. 122
8.2.9.2.2 UE-Initiated Connectivity to Additional PDN in WLAN on S2a p. 123
8.2.9.2.3 Handover procedure between 3GPP access and WLAN on S2a p. 124
8.2.9.2.4 PDN GW initiated Resource Allocation Deactivation p. 125
8.2.9.2.5 TWAN requested PDN Disconnection Procedures p. 125
8.2.9.2.6 UE requested PDN Disconnection Procedures p. 126
8.2.9.2.7 Detach Procedures p. 127
8.2.9.3 Impacts on existing nodes or functionality p. 127
8.2.9.4 Evaluation p. 128
8.2.10 Solution 10 : WCS Solution p. 128
8.2.10.1 Functional Description p. 128
8.2.10.1.1 Overview p. 128
8.2.10.1.2 User plane p. 128
8.2.10.1.3 Control plane p. 128
8.2.10.1.4 Protocol Stacks p. 131
8.2.10.2 Procedures p. 131
8.2.10.2.1 Initial Attach procedure p. 131
8.2.10.2.2 UE-initiated Connectivity to Additional PDN p. 133
8.2.10.2.3 Handover procedure in multi-connection scenario from 3GPP access to WLAN on S2a p. 134
8.2.10.2.4 Handover procedure in multi-connection scenario from WLAN on S2a to 3GPP access p. 135
8.2.10.2.5 Handover procedure from WLAN on S2a to 3GPP access p. 136
8.2.10.2.6 UE/TWAN Requested PDN disconnection in WLAN on S2a p. 137
8.2.10.2.7 UE initiated Detach in WLAN on S2a p. 138
8.2.10.2.8 HSS/AAA Initiated Detach Procedure in WLAN p. 139
8.2.10.2.9 PDN GW initiated Resource Allocation Deactivation p. 140
8.2.10.3 Impacts on existing nodes or functionality p. 140
8.2.10.4 Evaluation p. 140
8.2.11 Solution 11 - Two scenario approach using DHCPv4 and Stateless DHCPv6 and a VMAC u-plane p. 141
8.2.11.1 Functional Description p. 141
8.2.11.2 Procedures p. 142
8.2.11.2.1 Initial Attach in WLAN on S2a p. 143
8.2.11.2.2 Initial Attach in WLAN on S2a with hand-over p. 144
8.2.11.2.3 UE-Initiated Connectivity to PDN / NSWO in WLAN on S2a p. 145
8.2.11.2.4 Handover procedure for additional PDN connections from 3GPP access to WLAN on S2a p. 147
8.2.11.2.5 Handover procedure from WLAN on S2a to 3GPP access p. 148
8.2.11.2.6 Detach and PDN disconnection in WLAN on S2a p. 148
8.2.11.3 Impacts on existing nodes or functionality p. 150
8.2.11.4 Evaluation p. 151
8.3 Evaluation p. 152
9 Conclusion p. 152
9.1 Conclusion on SaMOG Phase 1 p. 152
9.2 Conclusion on SaMOG Phase 2 p. 153
9.2.1 Partial conclusions p. 153
9.2.2 Final conclusions p. 153
A Example of WLAN integrated with Femto p. 155
$ Change history p. 156
