1. 3GPP WLAN interworking requirements
May 2003
doc.: IEEE /229r1
July 2004
3GPP WLAN interworking requirements
Cheng Hong, Tan Pek Yew
(Panasonic)
WIEN
12th July 2004
Cheng Hong, Tan Pek Yew
Tan Pek-Yew, Matsushita Electric Ind.

2. WLAN issues identified in 3GPP
July 2004
WLAN issues identified in 3GPP
USIM based access control (WLAN)
Network sharing (discovery/selection)
traffic enforcement
Charging
Cheng Hong, Tan Pek Yew

3. Authentication scheme
July 2004
Authentication scheme
3GPP requires (U)SIM based access control
Explicitly identified by SA1 in LS answer to SA2 (s )
The use has to be authenticated using 3GPP system (e.g. USIM) in order to access 3GPP PS services
Therefore, WLAN has to support:
EAP based authentication (11i)
UE has to contain USIM support (hardware, or software)
Cheng Hong, Tan Pek Yew

4. Network sharing and selection
July 2004
Network sharing and selection
Two issues involved in the network sharing arch in 3GPP:
Network information Discovery
Network selection
Network information discovery includes:
- WLAN capability discovery (e.g. WLAN is a IWLAN, Link capability of the WLAN, QoS status, etc.)
- Network behind the WLAN (e.g. what PLMN is connected, relationship with UE’s HPLMN)
So far two methods proposed
- SSID based for WLAN selection
- (Information to be included in the beacon/probe)
- EAP based
- A method developed in the EAP group (using EAP error message)
* More details in 3GPP TS from 3GPP CN1 group
Cheng Hong, Tan Pek Yew

5. Traffic separation & enforcement
July 2004
Traffic separation & enforcement
Traffic separation & route enforcement
Especially important for a shared WLAN scenario
So far, VLAN is proposed in the 3GPP SA2 to provide the separation in TS23.234
This requires:
AP to support VLAN tagging
VALN tag to be delivered in the Authentication message
Cheng Hong, Tan Pek Yew

6. Charging requirements
July 2004
Charging requirements
WLAN Needs to support both for the interworking
Charging offline charged interworking subscribers
Charging online charged interworing subscribers
Details in TS sec 7.7 & 7.8
For online charging
WLAN needs to support realtime monitoring
AP should collect real time usage information and carry out the update
Information has to be updated to the charging entity in WLAN (AAA entities)
Needs to be able to revoke user connection based on credit/quota updates
Cheng Hong, Tan Pek Yew