3GPP based LTE and Wi-Fi Interworking Architecture: ePDG (S2b)NETMANIAS ONE-SHOT September 24, 2015

2015 Netmanias www.netmanias.com

UE

P-GW

ePDG

IPsec tunnel establishment & tear down by IKEv2, user data packet transmission within the IPsec tunnel

MOBIKE (IKEv2 extension) for inter Wi-Fi AP mobility notification from UE to ePDG (optional)

Connection Manger (CM) or ANDSF client for inter-RAT mobility decision

Interworking with P-GW for bearer/mobility service (S2b) Interworking with 3GPP AAA for user authentication (SWm) Interworking with UE for security & Wi-Fi mobility (IKEv2 with

MOBIKE extension/IPsec)

Interworking with ePDG (S2b) for bearer/mobility service IP mobility anchor for inter-RAT (LTE & Wi-Fi) handover UE IP allocation

NE Description

S-GW

P-GW

MME

HSS

3GPP

AAA

E-UTRAN

EPS-AKA

Diameter(Gx)

Diameter(SWm)

EAP-AKA

GTP Tunnel

GTP-U (S1-U)

GTP-U/C (S5)

GTP Tunnel

GTP-U/C (S2b)

GTP Tunnel

IPSec Tunnel

EPC

Wi-Fi

Diameter(SWa)

Diameter(S6b)

InternetIMS

PDN

eNB

WiFi

LTE

Diameter(SWx)

Diameter(S6a)

GTP-C (S11)

S1-AP(S1-MME)

IKEv2 w/ MOBIKE(SWu)

IP (SGi)

ePDG

SWu

AP

Wi-Fi

PCRF

ERAB Tunnel

Diameter(Rx)

ePDG based LTE and Wi-Fi Interworking Network Reference Model

optional

optional

HTTPS(S14)

optional

ANDSFHTTPS(S14)

optional

EPS Entity UE Traffic PathEPS Entity for Wi-Fi Interworking Wi-Fi Entity Dual-Radio UE

UE

LTE Access Wi-Fi Access

IPv4/IPv6

IPv4/IPv6

UE ePDGSWuL2/L1

IPv4/IPv6L2/L1 L2/L1

IPSec IPSec

IPv4/IPv6

GTP-U

S2b

IKEv2(MOBIKE)

GTP-CIKEv2(MOBIKE)

GTP-C

IPv4/IPv6L2/L1

IPv4/IPv6L2/L1 L2/L1 L2/L1

IPv4/IPv6 IPv4/IPv6

UE ePDG P-GWSWu S2b

UDP UDP

UDP

RelayingIPv4/IPv6

L2/L1IPv4/IPv6

GTP-U

P-GW

UDP

Diameter

EAP-AKA

IKEv2

IPv4/IPv6

UE ePDGSWuL2/L1

IPv4/IPv6L2/L1 L2/L1

IPv4/IPv6

SWm

SCTP

L2/L1IPv4/IPv6

3GPP AAA

SCTPUDP UDPIKEv2 Diameter

EAP-AKARelaying

S2b Protocol Stack Control Plane

S2b Protocol Stack Data Plane

S2b Protocol Stack Authentication

PDN

IMS

Default Bearer for VoLTE signaling (SIP) QCI = 5

S5 Bearer (GTP)

AP ePDG P-GW

IMSS5 Bearer (GTP)

Internet

Dedicated Bearer for VoLTE media (RTP) QCI = 1

S2b Bearer (IPsec)

Voice over ePDG (Wi-Fi calling) & Direct Internet access through AP

UE

logical i/flogical i/f

Netmanias 2015 09 24-3GPP based LTE and Wi-Fi Interworking (ePDG).vsd-1