The document discusses policy control in IMS networks. It explains that IMS allows more efficient implementation of services through reuse of common functions. The PDF (Policy Decision Function) plays a key role in IMS by authorizing and controlling resource usage. The PDF was separated from the P-CSCF in 3GPP Release 6. While some remain skeptical of IMS, it will allow experimentation with applications and flexible replacement of vendors.

1. Policy Control, Decision and Enforcement to Deliver IMS Services: An Analyst Perspective Ronald Gruia Program Leader, Principal Analyst - Emerging Communications © 2008 Frost & Sullivan. All rights reserved. This document contains highly confidential information and is the sole property of Frost & Sullivan. No part of it may be circulated, quoted, copied or otherwise reproduced without the written approval of Frost & Sullivan.

4. IMS: A More Efficient Service Implementation… Source: Frost & Sullivan PSTN “ Stovepipe” Service Model IMS Service Approach WLAN RAN IP Multimedia Subsystem . . . Application Servers Network Subsystem Base Station Subsystem Control Layer Application Layer Transport Layer Access Layer ... ... Multi-service IP Network Push to Talk Service QoS Billing / OSS Presence . . . . . . . . Interactive Gaming Service QoS Billing / OSS Presence . . . . . . . . Video Streaming Service QoS Billing / OSS Presence . . . . . . . . Billing / OSS QoS Presence Session Management and control Common functions are replicated Common functions are reutilized

11. A Word About Our IMS Model PDF CAPEX Calculation Source: Ronald Gruia, Frost & Sullivan (adapted from Bell Labs)

14. Q & A Session Ronald F. Gruia Program Leader, Principal Analyst – Emerging Telecoms  rgruia@frost.com  416-490-0493 Thank You

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