1 CDMA/GPRS Roaming Proposals Raymond Hsu, Jack Nasielski Feb. 2004

2 Outline Definition Requirements & Principles Reference Model Roaming Scenarios & Call Flow Examples

3 Definition Follow J-STD-038 notation style CDMA2000 Packet Data Native Subscriber –User whose home subscription resides in a CDMA2000 packet data system. GPRS Native Subscriber –User whose home subscription resides in a GPRS system. CDMA2000 Packet Data Foreign Mode –GPRS native subscriber accessing a CDMA2000 packet data system. GPRS Foreign Mode –CDMA2000 packet data native subscriber accessing a GPRS system. CDMA2000 Packet Data Native Mode (outside the scope) –CDMA2000 packet data native subscriber accessing a CDMA2000 packet data system. GPRS Native Mode (outside the scope) –GPRS native subscriber accessing a GPRS system.

4 Requirements Roaming Direction –It shall be possible to support the CDMA2000 packet data foreign mode. –It shall be possible to support the GPRS foreign mode. Authentication and Authorization –For operating in the CDMA2000 packet data foreign mode, the MS shall be authenticated and authorized by the home GPRS system. –For operating in the GPRS foreign mode, the MS shall be authenticated and authorized by the home CDMA2000 packet data system. Roaming Connectivity –It shall be possible for the roaming MS to establish connectivity to the Internet through the serving system directly, or through the serving and home systems.

5 Requirements Data Integrity and Privacy –Integrity of signaling and bearer data shall be supported. –Privacy of signaling and bearer data shall be supported. Accounting –The accounting information for the MS’s roaming access shall be made available to the home system. –A set of accounting record types shall be defined for CDMA2000/GPRS data roaming.

6 Principles Enhance the current Interworking and Interoperability Function (IIF) [J-STD-038] to support CDMA2000/GPRS packet data roaming. No change is required to the GPRS standards Minimize changes to the CDMA2000 packet data standards [IS-835].

7 Reference Model

8 Roaming Scenarios Mobile IPv4 in the GPRS foreign mode –CDMA2000 packet data native subscriber operates Mobile IPv4 in a visited GPRS system Simple IP in the GPRS foreign mode –CDMA2000 packet data native subscriber operates Simple IP in a visited GPRS system Mobile IPv4 in the CDMA2000 packet data foreign mode –GPRS native subscriber operates Mobile IPv4 in a visited CDMA2000 packet data system Simple IP in the CDMA2000 packet data foreign mode –GPRS native subscriber operates Simple IP in a visited CDMA2000 packet data system

9 Mobile IPv4 in the GPRS Foreign Mode

10 Mobile IPv4 in the GPRS Foreign Mode MS has shared secrets with the home CDMA2000 system for Mobile IP authentication. MS may request the home CDMA2000 system to assign a HA and/or an IP address. All data traffic (MS-originated and –terminated) may traverse through the IIF and home CDMA2000 system. IIF generates 3GPP2 packet data accounting records and sends it to the home CDMA2000 system via RADIUS.

11 Mobile IPv4 in the GPRS Foreign Mode

12 Simple IP in the GPRS Foreign Mode

13 Simple IP in the GPRS Foreign Mode MS has shared secrets with the home CDMA2000 system for Simple IP authentication (e.g., CHAP). MS establishes a PPP session, via L2TP, to the home CDMA2000 system. Home CDMA2000 system assigns an IP address to the MS dynamically. All data traffic (MS-originated and –terminated) traverses through the IIF and home CDMA2000 system. IIF generates 3GPP2 packet data accounting records and sends it to the home CDMA2000 system via RADIUS.

14 Simple IP in the GPRS Foreign Mode

15 Mobile IPv4 in the CDMA2000 Packet Data Foreign Mode

16 Mobile IPv4 in the CDMA2000 Packet Data Foreign Mode MS has shared secrets with the IIF for Mobile IP authentication. –3GPP specifications do not support Mobile IP FAC authentication in the AAA. The home GPRS system assigns an IP address to the MS dynamically. All MS’s data traffic (MS-originated and –terminated) traverses through the IIF and home GPRS system. IIF receives 3GPP2 accounting records from the visited CDMA2000 system and maps it to 3GPP accounting records and forward it to the home GPRS system via RADIUS.

17 Mobile IPv4 in the CDMA2000 Packet Data Foreign Mode

18 Simple IP in the CDMA2000 Packet Data Foreign Mode

19 Simple IP in the CDMA2000 Packet Data Foreign Mode MS has shared secrets with the home AAA in the GPRS system for CHAP or PAP authentication. The home GPRS system assigns an IP address to the MS dynamically. All MS’s data traffic (MS-originated and –terminated) traverses through the IIF and home GPRS system. IIF receives 3GPP2 accounting records from the visited CDMA2000 system and maps it to 3GPP accounting records and forward it to the home GPRS system via RADIUS.

20 Simple IP in the CDMA2000 Packet Data Foreign Mode