1. Technology Architecture & Standards Group © 2002 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 1 Secure User Plane Location Ileana Leuca Director Technology Architecture & Standards

2. Technology Architecture & Standards Group © 2003 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 2 OMA Groups Technical Plenary ArchitectureRequirements Interoperability Security Data Synchronization Developers Interest Group Device Management Game Services Mobile Protocols Mobile Web Services Location Mobile Commerce and Charging Messaging Presence and Availability Release Planning & Management Committee Operations and Process Committee Browser and Content Push to Talk Over Cellular Board of Directors

3. Technology Architecture & Standards Group © 2003 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 3 A-GPS over CONTROL Plane There are existing GPS Assistance data messages already defined and they can be re-used A-GPS over CONTROL plane has been standardised within 3GPP and 3GPP2, but these two solutions requires an upgrade of nearly all of the network elements and interfaces 3GPP defined stage 1&2 Improvement of the Le interface: Completed Enhanced support for anonymity and user privacy: Completed Enhanced support of roaming subscribers, inter GMLC Lr interface: on going OMA Location group defines stage 3 protocols MLP (mobile location protocol), RLP (roaming location protocol) and PCP (privacy checking protocol) already support or will support SIP-URI of the target mobile. Note: SA2 does not specify external protocols and it works very closely with the OMA-LOC in order to insure consistency between requirements and protocols specifications owned by OMA.

4. Technology Architecture & Standards Group © 2003 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 4 There are several proprietary implementations of A-GPS over USER plane already emerging in different markets It would be beneficial to have one single standard for Assisted GPS over USER/Application plane instead of WCDMA standard RRC messages ‘wrapped’ with a header GSM standard RLP messages ‘wrapped’ in XML IS95 / IS801 messages There is a large body of interest from Operators and Suppliers There are existing GPS Assistance data messages already defined User/Apps Plane A-GPS - today

5. Technology Architecture & Standards Group © 2003 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 5 New WI A-GPS Design Goals Make full A-GPS functionality available with minimum network changes Design to enable both Mobile Assisted and Mobile Based A-GPS Utilise existing standards where available and possible Open to enable other positioning technologies to utilise the mechanism

6. Technology Architecture & Standards Group © 2003 AT&T Wireless Services, Inc. AT&T WIRELESS — CONFIDENTIAL & PROPRIETARY Use pursuant to Company instructions 6 User/Apps Plane A-GPS AGPS over USER plane does not require an upgrade of a current IP capable network, so it is a lower cost solution and can be deployed rapidly This solution –is able to protect investment effectively, because 3G and 2G systems could share a common network positioning platform and even Mobile devices –may reduce the burden on signaling network –is not dependent on the underlying infrastructure except for an (IP) connection and supports outbound roamers –can reuse existing defined protocols –does not provide emergency call support