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