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WLAN-GPRS Integration For Next-Generation Mobile Data Networks

WLAN-GPRS Integration For Next-Generation Mobile Data Networks. Wireless Communications IEEE 2002 報告者：陳崇凱. Authors. Apostolis K. Salkintzis, Motorola Chad Fors, Motorola Rajesh Pazhyannur, Motorola. Outline. Integrated WLAN and cellular data networks Interworking architecture

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WLAN-GPRS Integration For Next-Generation Mobile Data Networks

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  1. WLAN-GPRS Integration ForNext-Generation Mobile Data Networks Wireless Communications IEEE 2002 報告者：陳崇凱

  2. Authors • Apostolis K. Salkintzis, Motorola • Chad Fors, Motorola • Rajesh Pazhyannur, Motorola

  3. Outline • Integrated WLAN and cellular data networks • Interworking architecture • Current standardization activities • A tight coupling architecture • A loosely coupled architecture • Conclusion

  4. Integrated WLAN and Cellular Data Networks • Roaming • Between WLANs and cellular system • Session mobility • Session : a flow of IP packets between the end user and an external entity • Enhanced mobile applications • Ex : mobile email application

  5. Interworking Architecture • Loose couplingand Tight coupling. • With loose coupling the WLAN bypasses the GPRS network and provides direct data access to the external packet data networks (PDNs). • With tight coupling the WLAN data traffic goes through the GPRS core network before reaching the external PDNs.

  6. Current Standardization Activities • Scenario 1 — Common billing and customer care • Scenario 2 — 3GPP system-based access control and charging • Scenario 3 — Access to 3GPP GPRS-based services • Scenario 4 — Service continuity • Scenario 5 — Seamless services • Scenario 6 — Access to 3GPP circuit-switched services

  7. A Tight Coupling Architecture • Providing a novel solution for interworking between 802.11 WLANs and GPRS. • System description • Protocol architecture • WLAN adaptation function • GIF/RAI discovery procedure

  8. A Tight Coupling Architecture • BENEFITS • Seamless service continuation across WLAN and GPRS. • Reuse of GPRS AAA. • Reuse of GPRS infrastructure and protection of cellular operator’s investment. • Support of lawful interception for WLAN subscribers. • Increased security. • Common provisioning and customer care. • Access to core GPRS services

  9. A Loosely Coupled Architecture • authentication • encryption • billing • session mobility

  10. Conclusion • The recent evolution and successful deployment of WLAN systems worldwide has fueled the need for interworking mechanisms between WLANs and cellular data networks such as GPRS. • Comparison : tight coupling vs. loose coupling

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