WLAN-GPRS INTEGRATION FOR NEXT-GENERATION MOBILE DATA NETWORKS 通訊工程所 蔡名岳

Outline INTRODUCTION INTEGRATED WLAN AND CELLULAR DATA NETWORKS INTERWORKING ARCHITECTURES CURRENT STANDARDIZATION ACTIVITIES A TIGHT COUPLING ARCHITECTURE A LOOSELY COUPLED ARCHITECTURE CONCLUDING REMARKS

1.INTRODUCTION More necessity and less luxury on the ability to communicate 2G -> 2.5G (GPRS) -> 3G Delay of 3G cellular networks  – –offerings with “ 3G-like ” services in efforts to generate new revenue stream in today ’ s environment.

2.INTEGRATED WLAN AND CELLULAR DATA NETWORKS ROAMING SESSION MOBILITY ENHANCED MOBILE APPLICATIONS

2.INTEGRATED WLAN AND CELLULAR DATA NETWORKS Cellular data network provide – –low-speed data service – –over a large coverage area. WLAN provides – –high-speed data service – –over a geographically small area.

2.INTEGRATED WLAN AND CELLULAR DATA NETWORKS

ROAMING: ownership/management problem Cellular owned WLAN – –operators are able to enhance their data service capabilities with high-speed data connectivity WISP owned WLAN – –The WISP may partake in revenue sharing with the cellular operator, based on the particular roaming agreements between the two parties.

2.INTEGRATED WLAN AND CELLULAR DATA NETWORKS SESSION MOBILITY – –An evolutionary step from roaming in this integrated environment. – –Session is defined here as a flow of IP packets between the end user and an external entity – –EX:FTP,HTTP

2.INTEGRATED WLAN AND CELLULAR DATA NETWORKS ENHANCED MOBILE APPLICATIONS – –The possibility of cellular customers being connected to two different access networks, a number of enhanced applications can be enabled. – –take advantage of the fact that the end user is always connected through a low-speed cellular network and sometimes connected through a high-speed WLAN. – –EX: a mobile application that schedules the delivery of large files when the mobile is connected to the WLAN network, and delivers only synopses of s when the mobile is connected to the GPRS network.

3.INTERWORKING ARCHITECTURES loose coupling and tight coupling

4.CURRENT STANDARDIZATION ACTIVITIES Common billing and customer care GPP system-based access control and charging Access to 3GPP GPRS-based services Service continuity Seamless services Access to 3GPP

5.A TIGHT COUPLING ARCHITECTURE Tight coupling architecture provides a novel solution for interworking between WLANs and GPRS – –Seamless service continuation across WLAN and GPRS – – Reuse of GPRS AAA. – – Reuse of GPRS infrastructure – – Support of lawful interception for WLAN subscribers – – Increased security – – Common provisioning and customer care – – Access to core GPRS services

5. A TIGHT COUPLING ARCHITECTURE

6. A LOOSELY COUPLED ARCHITECTURE In tight coupling, the WLAN data traffic does not pass through the GPRS core network but goes directly to the operator ’ s IP network

6. A LOOSELY COUPLED ARCHITECTURE

AUTHENTICATION An authentication similar to GPRS may occur within the WLAN network, depending on the particular implementation. Where the GPRS operator owns the WLAN – –the operator will reuse SIM-based authentication (within the WLAN environment. – –for a subscriber to access services provided by a GPRS operator over any WLAN access network, regardless of whether the WLAN is owned by a GPRS operator, (U)SIM-based authentication may be used.

6. A LOOSELY COUPLED ARCHITECTURE ENCRYPTION – –A commonly believed weakness of the WLAN standard is in its encryption technology. – –Wired Equivalent Privacy (WEP) has been shown to be a relatively inefficient encryption scheme, if used as is as the only form of encryption. – –With the use of EAP, WEP may be enhanced by the use of a unique session key for each user of the WLAN.

6. A LOOSELY COUPLED ARCHITECTURE BILLING – –Integrated billing is achieved via the billing mediator function in the loosely coupled architecture of Fig.8 SESSION MOBILITY – –Mobile IP (MIP) can be used to provide session mobility across GPRS and WLAN domains. The MIP framework consists of a MIP client (the MS), a foreign agent (FA), and a home agent(HA).

CONCLUDING REMARKS