Integration of wireless LAN and 3 G wireless

Integration of wireless LAN and 3 G wireless - Interworking architecture between 3 GPP and WLAN systems Ahmavaara, K. ; Haverinen, H. ; Pichna, R. ; Communications Magazine, IEEE 11 , Nov. 2003 報告者 : 洪英富 11/26

outline o o WLAN system architecture 3 GPP-based WLAN Access , Authentication and Authorization User Data Routing and Access to Services 3 GPP-Based Charging for WLAN 11/26

WLAN system architecture o o o o WLAN terminal Layer 2 distribution network DNS DHCP AAA server / proxy Billing system Http server Gateway NAPT 11/26

WLAN system architecture 11/26

WLAN system architecture (3 GPP Subscription for WLAN) o o SIM/USIM HSS 11/26

3 GPP-Base WLAN Access Authentication and Authorization o o o IEEE 802. 11 i EAP SIM : authentication and key agreement protocol base on GSM EAP AKA : encapsulates the UMTS Authentication and Key Agreement within EAP 11/26

User Data Routing and Access to Services o o o The technical architecture regarding user data routing has not been agreed on in 3 GPP IP network selection : W-APN , similar to the APN parameter used in GPRS PDG : terminates the tunnel and acts as a gateway to the selected remote IP network WAG : implement tunneling Wn , Wp , Wu , W i : data plane Wg , Wm : control plane 11/26

User Data Routing and Access to Services 11/26

3 GPP-Based Charging for WLAN o o o Two different charging methods : (1)postpaid (2)prepaid : CG : for postpaid , The charging information collection happens via so-callde charging gateway (CG) OCS : online charging system for prepaid 11/26

3 GPP-Based Charging for WLAN o . . 11/26