4.5.4.5 ePDG Selection with DNS-based Discovery of Regulatory Requirements...................................................39
4.5.4a ePDG Selection for Emergency Services........................................................................................................40
4.5.4a.1 General 40
4.5.4a.2 Emergency ePDG Selection Procedure........................................................................................................40
4.5.5 PCRF Selection.................................................................................................................................................40
4.5.6 DSMIPv6 Home Link Detection Function.......................................................................................................40
4.5.7 IMS Emergency Session Support......................................................................................................................41
4.5.7.1 Overview 41
4.5.7.2 IMS Emergency Session Support over WLAN access to EPC......................................................................41
4.5.7.2.1 Introduction.................................................................................................................................................41
4.5.7.2.2 Architecture Reference Model for Emergency Services.............................................................................42
4.5.7.2.3 PDN GW selection function for Emergency Services................................................................................42
4.5.7.2.4 QoS for Emergency Services......................................................................................................................43
4.5.7.2.5 PCC for Emergency Services......................................................................................................................43
4.5.7.2.6 IP Address Allocation.................................................................................................................................43
4.5.7.2.7 Handling of PDN Connections for Emergency Bearer Services................................................................43
4.5.7.2.8 Network provided WLAN Location Information.......................................................................................43
4.5.7.2.9 Determination of location...........................................................................................................................45
4.5.7.2.10 Support of PS handover with 3GPP EPC..................................................................................................45
4.5.8 APN congestion Control Function for eHRPD.................................................................................................46
4.5.9 GTP-C signalling based Load and Overload Control for trusted and untrusted WLAN..................................46
4.5.9.1 GTP-C load control........................................................................................................................................46
4.5.9.2 GTP-C overload control.................................................................................................................................46
4.6 Identities...............................................................................................................................................................48
4.6.1 User Identification.............................................................................................................................................48
4.6.2 EPS bearer identity with GTP based S2b/S2a...................................................................................................48
4.7 IP Address Allocation..........................................................................................................................................48
4.7.1 IP Address Allocation with PMIP-based S5/S8................................................................................................48
4.7.2 IP Address Allocation in Trusted Non-3GPP IP Access using PMIPv6 on S2a..............................................53
4.7.3 IP Address Allocation in Untrusted Non-3GPP IP Access using PMIPv6 or GTP on S2b..............................56
4.7.4 IP Address Allocation using S2c.......................................................................................................................56
4.7.5 IPv6 Prefix Delegation using S2c.....................................................................................................................57
4.7.6 IPv6 Prefix Delegation using PMIP-based S5/S8.............................................................................................57
4.8 Network Discovery and Selection........................................................................................................................59
4.8.0 General Principles.............................................................................................................................................59
4.8.1 Architecture for Access Network Discovery Support Functions......................................................................60
4.8.2 Network Elements.............................................................................................................................................61
4.8.2.1 Access Network Discovery and Selection Function (ANDSF).....................................................................61
4.8.2.1.1 General 61
4.8.2.1.2 Inter-System Mobility Policy......................................................................................................................61
4.8.2.1.3 Access Network Discovery Information.....................................................................................................62
4.8.2.1.4 Inter-System Routing Policy.......................................................................................................................62
4.8.2.1.5 Inter-APN Routing Policy...........................................................................................................................63
4.8.2.1.6 WLAN Selection Policy..............................................................................................................................64
4.8.2.1.7 VPLMNs with preferred WLAN Selection Rules......................................................................................65
4.8.2.1.8 Void 66
4.8.2.1.9 Home Network Preferences........................................................................................................................66
4.8.2.1.10 Visited Network Preferences.....................................................................................................................66
4.8.2a UE Procedures.................................................................................................................................................67
4.8.2a.1 Selection of Active ANDSF Rules...............................................................................................................67
4.8.2a.2 UE Behavior Based on the ANDSF Information.........................................................................................68
4.8.2b WLAN Selection based on WLANSP............................................................................................................70
4.8.3 Reference Points................................................................................................................................................72
4.8.4 ANDSF Discovery............................................................................................................................................72
4.8.5 Void 72
4.8.6 Support of RAN Assistance Information..........................................................................................................72
4.8.6.1 General 72
4.8.6.2 ANDSF Rules Utilizing RAN Assistance Information..................................................................................72
4.8.6.3 Evaluation of ANDSF Rules with RAN Validity Conditions........................................................................73
4.8.6.4 Co-existence with RAN Rules.......................................................................................................................74
4.8.7 Support of LWA, LWIP and RCLWI...............................................................................................................75
3GPP
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