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Support of Multiple Access Technologies in 3GPP
Farooq Bari
UBC WorkshopMarch 9, 2007
Release 6 I-WLAN
3GPP Network
WLAN UE
WLAN Access Network(with or without an
intermediate network)
3GPP AAAServer
Packet Data GW
3GPP PS services (includingaccess to internet)
Intranet / Internet
WLAN 3GPP IP Access
Non-Roaming IWLAN Architecture
WLAN 3GPP IP Access
3GPP Home Network
WLAN Access Network
WLANUE
Ww
HSS HLR
OfflineChargingSystem
OCSWa
Wn
Wx
D' / Gr'
Wf
Wo
Wi
Intranet / Internet
Wm
WAG Wp PDG
Wg
Wu
Dw
SLF
3GPP AAAServer
Wy
Wz
Roaming IWLAN Architecture
W w
3 G P P H o m e N e tw o rk
W L A N A c c e s s N e tw o rk
W L A NU E
3 G P P A A AS e rve rH S S
H L R
O ff lin eC h a rg in gS ys te m
O C S
D ' / G r'
W f Wo
In tra n e t / In te rn e t
3 G P P V is ite d N e tw o rk
3 G P P A A AP ro xy
O ff lin eC h a rg in gS ys te m
P a c k e t D a taG a te w a yW A G
W n W p
W a
Wi
Wf
Wd
W x
W g
W u W L A N 3 G P PIP A c c e s s
D wS L F
W m
W z
Roaming IWLAN Architecture
W w
3 G P P H o m e N e tw o r k
W L A N A c c e s s N e tw o r k
W L A NU E
P a c k e t D a taG a te w a y
H S S
H L R
O f f l in eC h a rg in gS y s te m
O C S
D' / Gr'Wf
Wo
In t r a n e t / I n te rn e t
3 G P P V is i te d N e tw o r k
3 G P P A A AP ro x y
O f f l in eC h a rg in gS y s te m
W A GW n
W aW f
Wd
Wp
W m
Wi
W x
WLA
N 3
GP
P IP
Acc
ess
W g
W u
Dw
3 G P P A A AS e rv e r
S L F
W y
W z
Protocol stack between the WLAN UE and the Packet Data Gateway
I-WLAN and VPLMN selection procedure
WLAN Access Authentication and Authorisation
W L A N U E W L A N A N 3 G P P A A AS e r v e r H S S / H L R W A G
1 . W L A N C o n n e c t io n S e t u p
2 . N e c e s s a r y a m o u n t o f E A P R e q u e s t & E A P R e s p o n s e m e s s a g e e x c h a n g e s b e t w e e n U E a n d 3 G P P A A A S e r v e r as s p e c if ie d in th e u t ilis e d E A P ty p e
3 . A u t h e n t ic a t io n In fo r e t r ie v a l f ro m H S S if in fo n o t y e t a v a ila b le in 3 G P P A A A s e r v e r
4 . S u b s c r ib e r p r o f ile r e tr ie va l f ro m H S S if in fo n o t y e t a v a ila b le in t h is 3 G P P A A A s er v er
5 . P o lic y e n f o r c e m e n t in fo d e liv e r y
6 . A c c e s s A c c e p t
7 . E A P / S u c c e s s
9 . V a lid a t e t h e n e w s e s s io n
1 0 . W L A N R e g is t r a t io n to H S S if W L A N u s e r n o t y e t r e g is t e r e d t o th is 3 G P P A A A S e r v e r
[k e y in g m a te r ia l a n da u th o r is a t io n in f o r m a t io nw ith in m e s s a g e ]
8 . A c c o u n t in g S t a r t
W-APN resolution and Tunnel establishment
WLAN UE WLAN AN WAG 3GPP AAAServer/Proxy Visited PDG 3GPP AAA
Server Home PDG
1. WLAN UE local IP address allocation and optionally WLAN Access Authentication and Authorization
2. W-APN resolution and tunnel establishment to PDG in Visited PLMN2.1 DNS query:
2.2 End-to-end tunnel establishment
2.3 RetrievingAuthentication
andAuthorization
data
2.4 Tunnel packet flow filter exchange
3. W-APN resolution and tunnel establishment to PDG in Home PLMN
3.1 DNS query:
3.2 End-to-end tunnel establishment3.3 Retrieving
Authenticationand
Authorizationdata
3.4 Tunnel packet flow filter exchange
Release 6 Support for non-3GPP Access Technologies
Scenario 2 i.e. common authentication, and billing supported Scenario 3 partially supported with No QoS, partial IMS support (for example no emergency call support), no IMS supportScenario 4 and above with Mobility, seamless service continuity, support for CS type services not supported.
Release 7 additions Support for Diffserv type QoS model for I- WLANThe text in specification made generic so that any access technology that can support the identified interfaces in the specifications will be included.Addition of Support for non-3GPP Access Types in Policy Control and Charging ArchitectureStill no support for Mobility or Session Continuity
Support for Multiple Access Technologies in System
Architecture Evolution (SAE)
Trusted/Untrusted*Non-3GPP IP Access
or 3GPP Access
SGi
PCRF
S7
S6a
HSS
ePDG
S2b
Serving SAE Gateway
Wn*
3GPP AAA Server
Operator’s IP Services (e.g. IMS, PSS etc.)
Wm*
Wx*
UntrustedNon-3GPP IP Access
TrustedNon-3GPP IP Access
Wa*
Ta*
HPLMN
Non-3GPP Networks
S1-U
S1-MME
EUTRAN
2G/3G SGSNS4
S3
S5
S6c
Rx+
S2a
PDN SAE Gateway
MMES11
S10
UE
S2c
* Untrusted non-3GPP access requires ePDG in the data path
Serving SAEGateway
SGi
hPCRF
S7S6a
HSS
ePDGS2b
Wn*
3GPP AAA Proxy
Operator’s IP Services (e.g. IMS, PSS etc.)
Wm*
Wx*
UntrustedNon-3GPP IP Access
TrustedNon-3GPP IP Access
Wa*
Ta*
PDN SAEGateway
S8bHPLMN
Wd*
Non-3GPP Networks
vPCRF
S9
S7
S6d
3GPP AAA Server
VPLMN
Rx+
S2aS2a
S2b
S6c
S1-U
S1-MME
LTE RAN
2G/3G SGSN S4
S3
MMES11
S10
UE
Trusted/Untrusted*Non-3GPP IP Access
or 3GPP Access
S2c
S2c
* Untrusted non-3GPP access requires ePDG in the data path
Topics under discussionMobility and Service/Session ContinuityPolicy Control, QoS and ChargingNetwork Discovery and SelectionSAE IdentitiesAuthentication and Authorization
Initial Attach using Network based MM over S2b for non-Roaming
Initial Attach using Host based MM over S2b for non-Roaming
Support for IMS across Access Technologies
IMS is considered a service enabler and separate from underlying transport access typesIt was made largely access agnostic in Release 5.Harmonization of IMS across different access types already underwayCablelabs, TISPAN and other forums already contributing to this effortNew Concepts: Core IMS and Common IMS
Reference 3GPP DocumentsTS 23.234TR 23.882TS 23.401TS 23.402
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