1. 3GPP2-WLAN Interworking update
September 2004
3GPP2-WLAN Interworking update
Stefan Rommer, Lila Madour
(Ericsson)
S. Rommer, L. Madour (Ericsson)

2. Phased approach Scenario 1: Common billing and customer care.
Month 2002
doc.: IEEE /xxxr0
September 2004
Phased approach
Scenario 1: Common billing and customer care.
Scenario 2: cdma2000 based Access Control and Charging and Access to the Internet via the WLAN system.
Scenario 3: Access to the cdma2000 Packet Data Services via the WLAN system.
Scenario 4: Session continuity.
Scenarios 1 and 2 will be supported in the first release
S. Rommer, L. Madour (Ericsson)
John Doe, His Company

3. 3GPP2 WLAN activities Stage 1: Requirements
September 2004
3GPP2 WLAN activities
Stage 1: Requirements
3GGP2 S.R (completed)
Stage 2/3: Architecture and Protocols
Currently work in progress in PSN.PDS sub-working Group.
Draft specification in the 3GPP2 document X.P0028
Publication is planned for early Q
The first release focuses on scenario 1 and 2 only.
Scenario 3 and 4 will be considered in future release.
S. Rommer, L. Madour (Ericsson)

4. cdma2000-WLAN Network Reference Model
September 2004
cdma2000-WLAN Network Reference Model
Broker Network (0 or more)
cdma2000 Home Network
Database
B-AAA 2
H-AAA
HLR/AC 2
Mobile Station 1
W-AAA 3
Internet
WLAN
S. Rommer, L. Madour (Ericsson)

5. Interfaces Interface 1 Interface 2 Interface 3 AAA-HLR/AC interface
September 2004
Interfaces
Interface 1
Based on WLAN technologies such as IEEE , 802.1X, i, etc.
Interface 2
Used for Authentication, Authorization and Accounting. The interface is based on RADIUS and supports EAP.
Interface 3
Access to Internet
AAA-HLR/AC interface
based on ANSI 41 MAP signaling
S. Rommer, L. Madour (Ericsson)

6. September 2004
User Authentication
3GPP2 recommends two EAP methods for User Authentication and WLAN PMK derivation and they are:
EAP-AKA (work in progress in IETF)
EAP-TLS with Pre-shared keys (work in progress in IETF)
User Authentication would be based on a bootstrapped WLAN Key (Wkey)
3GPP2 specifies EAP methods to bootstrap a long term Wkey based on one of the existing cdma2000 shared secrets used for 2G or 3G.
Currently under discussion
EAP-AKA and EAP-TLS derive a session key that is delivered to the AP
S. Rommer, L. Madour (Ericsson)

7. Network Advertisement and Selection
September 2004
Network Advertisement and Selection
3GPP2 support manual and automatic network selection.
Automatic selection requires information about cdma2000 related SSIDs as well as roaming agreements with the home network.
S. Rommer, L. Madour (Ericsson)

8. Other User Authentication schemes
September 2004
Other User Authentication schemes
Authentication in a non-802.1X hotspot can be performed using:
Universal Access Method as defined by the WISPr in Wi-Fi Alliance
CHAP/PAP if WLAN supports PPPoE (similar to cdma2000 packet data access authentication)
S. Rommer, L. Madour (Ericsson)

9. Issues related to 802.11 Network selection UAM/802.1X co-existence
September 2004
Issues related to
Network selection
UAM/802.1X co-existence
Session control / session termination
S. Rommer, L. Madour (Ericsson)

10. Links to documents Stage 1: Requirements
September 2004
Links to documents
Stage 1: Requirements
Stage 2/3: Architecture and Protocols
Draft 0.5 ( )
ftp://ftp.3gpp2.org/TSGX/Working/2004/ /TSG-X LA/WG3-PSN/SWG31-PDS/x %20X.P0028%20v0.5%20WLAN%20Interworking-%5BED%5D.doc
S. Rommer, L. Madour (Ericsson)

11. Acronyms AC: Authentication Center (used in 2G cdma authentication)
September 2004
Acronyms
AC: Authentication Center (used in 2G cdma authentication)
HLR: Home Location Register (used in 2G cdma authentication and authorization)
MS: Mobile Station
MN-AAA: Mobile Node- Authentication Authorization and Accounting server.
RUIM: Removable User Identity Module (similar to SIM in GSM)
UIM: User Identity Module
S. Rommer, L. Madour (Ericsson)

12. Back-up slide Bootstrapping of a long term WLAN key (work in progress)
September 2004
Back-up slide Bootstrapping of a long term WLAN key (work in progress)
3GPP2 specifies EAP methods to bootstrap a long term WLAN key (Wkey) based on either one of the following cdma2000 shared secrets:
SMEKEY used in 2G circuit switched authentication stored in the HLR/AC and the UIM/RUIM in the MS or,
MN-AAA/CHAP secret used for 3G packet data user authentication; stored in the Home AAA and the UIM/RUIM in the MS.
The SMEKEY or the MN-AAA/CHAP secret is used as the password for authenticating a Diffie-Helman key exchange between the MS and the EAP server in the AAA.
S. Rommer, L. Madour (Ericsson)