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
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