1. Page 1 Inter Working Between Trusted and Non-Trusted Models LBS Roaming Meeting, Macau March 22, 2007 Inter Working Between Trusted and Non-Trusted Models LBS Roaming Meeting, Macau March 22, 2007

2. Page 2 Roaming Scenarios Matrix Visited operator TrustedNon-Trusted (V1/V2 or proprietary 2) Proprietary Trusted 1 Home operator TrustedSharing BSA PDE interconnection DNS Sharing BSA PDE interconnection DNS Sharing BSA PDE interconnection DNS Non-Trusted (V1/V2 or proprietary) Sharing BSA PDE interconnection MPC allocates V-PDE Sharing BSA PDE interconnection MPC interconnection Sharing BSA PDE interconnection MPC allocates V-PDE Proprietary trusted Sharing BSA PDE interconnection Sharing BSA PDE interconnection Sharing BSA PDE interconnection 1 Proprietary trusted LBS carrier is a carrier that uses a custom scheme for TCP/IP wrapper for IS-801 signaling. 2 Proprietary nontrusted LBS carrier is a carrier that is architecturally similar to V1/V2 nontrusted and uses an MPC, but such a carrier uses additional custom interfaces to address special needs.

3. Page 3 Non-Trusted to Trusted Roaming (Without An Inter-PDE Interface) Internet Internet Home operator – Nontrusted LBS model AAA RAN PDSN PCF Visited operator – Trusted LBS model AAA RAN PDSN FA PCF H-PDE HA V-PDE BSA H-MPC Services layer signaling on MS-MPC interface. V-PDE allocation by H-MPC BSA Positioning layer (IS-801) signaling between MS and V-PDE Network connection MIP tunnel The Visited MS connects to H-MPC and sends services layer authorization request. The H-MPC detects that the MS is roaming based on SID/NID information and allocates the V-PDE address in service authorization response The Visited MS initiated an IS-801 positioning session with the V-PDE The H-MPC positioning authorization records and VDE billing procedures can be used for settlement/billing

4. Page 4 Non-Trusted to Trusted Roaming (With An Inter-PDE Interface) For LBS roaming between a nontrusted (home) and a trusted (visiting) carrier, the H-MPC allocates the H-PDE address as it normally does for its home devices Internet Internet Home operator – Nontrusted LBS model AAA RAN PDSN PCF Visited operator – Trusted LBS model AAA RAN PDSN FA PCF H-PDE HA V-PDE BSA H-MPC Services layer signaling on MS-MPC interface. BSA Positioning layer (IS-801) signaling between MS and H-PDE Network connection MIP tunnel Inter-PDE transaction protocol The roaming device initiates IS-801 call flow with the H-PDE The H-PDE sends transaction requests over the inter-PDE connection to satisfy the requested IS-801 call flow The H-PDE uses existing home procedures for settlement/billing

5. Page 5 Trusted to Non-Trusted Roaming (With Inter PDE Interface) Internet Internet Home operator – Trusted LBS model AAA RAN PDSN PCF Visited operator – Non-Trusted LBS model AAA RAN PDSN FA PCF H-PDE HA V-PDE BSA Positioning layer (IS-801) signaling between MS and H-PDE Network connection MIP tunnel Inter-PDE transaction protocol V-MPC The Mobile Station in this case always connects to its H-PDE for doing positioning using IS- 801 signaling The H-PDE detects that the Mobile Station is roaming in this case and the H-PDE then uses transaction services over the inter-PDE link to serve the IS-801 session of the roaming mobile station The H-PDE uses existing home procedures for billing and settlement

6. Page 6 Trusted to Non-Trusted Roaming (With DNS) Internet Internet Home operator – Trusted LBS model AAA RAN PDSN PCF Visited operator – Non-Trusted LBS model AAA RAN PDSN FA PCF H-PDE HA V-PDE BSA Positioning layer (IS-801) signaling between MS and H-PDE Network connection MIP tunnel The Mobile Station in this case uses a LBS specific DNS FQDN (Example SID.NID.Local.PDE) to do DNS resolution for the V-PDE IP address Once V-PDE IP address is received, the Mobile Station initiates the IS-801 session with the V-PDE. More details on how the DNS solution can be implemented can be found on the CDG IRT WiKi page Once IS-801 session is completed. the V-PDE can send an unsolicited report message (gpsoreq’) to the V-MPC. V-MPC can use this message for billing/settlement. V-MPC

7. Page 7 Trusted to Non-Trusted Roaming (continued) For the PDE interconnection solution using transaction protocol the roaming device always connects to the H-PDE and the H-PDE appropriately sends transaction requests to the V-PDE to complete the IS- 801 call flow.  The H-PDE and V-PDE are interconnected using standard solutions, such as VPN. This is a controlled interface on which the roaming partner provides a wholesale LBS service.  User level authentication is not the responsibility of V-PDE. The V-PDE will serve the incoming location requests in a trusted manner with the assumption that all the authentication checks have been successfully performed at the Home LBS system. For the DNS solution, the device in the visited network will get the V-PDE IP address via DNS resolution. Details on how the DNS resolution schemes can work are captured in a separate document on CDG IRT WiKi page.  The non-trusted visited carrier’s PDE should allow the roaming partner’s devices to access the visited PDE via a new trusted port.  Once the LBS application resolves the V-PDE’s IP address (via DNS), it will attempt to access the V-PDE on the new trusted port.