2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 1 GPRS for a Mobile Internet Symmetry Communications We Make the Internet Mobile Patrick Tao VP, Product Marketing Feb 14, 2001

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 2 Our Mission To develop and deliver award winning packet data solutions that drive rapid adoption of the mobile Internet.

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 3 Mobile Internet Vision Enabling the Mobile Internet – GPRS Traditional Circuit Switched Wireless Network BSS BTS PSTN Devices Diverse Devices and User Styles Mobile Internet Independent and Affiliated Content & Application Providers Enterprise Networks eBusiness Powered Corporations Traditional Mobile Voice

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 4 Worldwide Cumulative Subscribers Mobile Data Market Opportunity Source: CE/NSS Forecast used for Cumulative Subscribers Mobile Wireless is the Next Telecom Revolution

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 5 New Revenue Opportunities Devices Grow Market Share and Revenues through Network of… Personalized Customized mBusiness mConsumer RetailCorpFinetc. Benefits Lower churn Higher ARPUs Applications & Services Content AOLYahoo! Yellow Pages etc. Device optimized Location based Timely Highly segmented Open access Characteristics Rich Applications High-value content Subscribers

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 6 Cut Operating and Network Costs Deploy Networks that Leverage IP Technologies Applications & Services IPWCDMA. Network Migrate from voice-only mobility to mobile eCommerce Evolutionary transition to IP networks Higher Speed radios Optimize network for Mobile Internet services and applications Subscribers Content Devices

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 7 ARPU* Transition Phase Voice- based Business Information- based Business Voice Services Revenues Voice Services Revenues Information Service Revenues Information Service Revenues Net Revenues Bottoming out *ARPU: Average Revenue per Unit in Service Operator Business Imperative 2G 2.5G Systems 3G Systems

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 8 GSM Data Services CSD - Circuit switched data (9.6 kbps) HSCSD - High Speed CSD (n x CSD kbps) GPRS - General packet radio service (up to 115 kbps) EDGE - Enhanced Data service for Global Evolution (up to 384 kbps) UMTS – Universal Mobile Telecommunication System (up to 2Mbps)

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 9 Wireless Packet Switched Data Transmits information in packets Connectionless or datagram service with destination address in packets Radio channels are shared by multiple users Always on, always connected Well suited for IP data transmission

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 10 GPRS Standard A standard from ETSI on packet data in GSM systems Accepted by TIA for TDMA/ANSI-136 Supports IP and X.25 Up to 115 kbps (14.4 kbps x 8) Point-to-point and point-to-multipoint services

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 11 GPRS Terminals Class A – support simultaneous GPRS and GSM voice services with two channels Class B – support either GPRS and GSM voice services with simultaneous network attachment Class C – support only GPRS service

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 12 GPRS Data Rates SchemeData Rate (kbps) Note CS Best performance for low C/I values CS CS-2 and CS-3 have similar performance CS CS-2 and CS-3 have similar performance CS Needs high C/I values

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 13 Services Enabled by GPRS eCommerce -> mCommerce WAP and iMode applications (mobile internet browsing) Mobile Corporate Intranet (online publishing, corporate automation, …) File sharing (MP3, MPEG4, …) P2P Messaging (IM, , SMS) Others: Active Personal Information Management Everything you can do on the Internet today but Anywhere, Anytime, Anyplace:

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 14 GPRS Architecture SGSN Internet GGSN A Gb GrGs Gc Gi Gp Other PLMN Gn BSC BG TE MSC/VLRHLR EIR SMS-GMSC SMS-IWMSC SM-SC Gd D EC Gf Signaling Interface Signaling and Data Transfer Interface RUm Abis BTS BSC MTTE BTSMTTE BTSMTTE SGSN Gn PSTN, ISDN etc AuC H F BG BSS Frame Relay Network Cost Efficient Mobile Internet Upgrade of GSM and TDMA Networks

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 15 GPRS G Interfaces GaCharging data collection interface between a CDR transmitting unit (e.g., an SGSN or a GGSN) and a CDR receiving functionality (a CGF). GbInterface between an SGSN and a BSS (Base Station System). GcInterface between a GGSN and an HLR. GdInterface between a SMS-GMSC and an SGSN, and between a SMS-IWMSC and an SGSN. GfInterface between an SGSN and an EIR (Equipment Identity Register). GiReference point between GPRS and an external packet data network. GnInterface between two GSNs within the same PLMN. GpInterface between two GSNs in different PLMNs. The Gp interface allows support of GPRS network services across areas served by the co-operating GPRS PLMNs. GrInterface between an SGSN and an HLR GsInterface between an SGSN and an MSC/VLR

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 16 Serving GPRS Support Node (SGSN) Perform mobility management for GPRS terminals (attach/detach, user authentication, ciphering, location management) Manage the logical link to mobile terminals (packet traffic, SMS traffic, layer 3 signaling) Route packets between mobile terminals and the GGSN Charging information

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 17 Gateway GPRS Support Node (GGSN) Function as a gateway router between SGSN and external networks Authenticate users to external networks Assign or obtain from external packet network PDP addresses to mobile terminals Charging information

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 18 GPRS Network Functions SGSN Internet GGSN A Gb GrGs Gc Gi Gp Other PLMN Gn BSC BG TE MSC/VLRHLR EIR SMS-GMSC SMS-IWMSC SM-SC Gd D EC Gf Signaling Interface Signaling and Data Transfer Interface RUm Abis BTS BSC MTTE BTSMTTE BTSMTTE SGSN Gn PSTN, ISDN etc AuC H F BG BSS Frame Relay Network Mobile Power up Connect to Web Mobility Handoffs 1 2 3

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 19 GPRS is the proven path to the high speed Mobile Internet GPRS packet technologies improve usage efficiency of network resources Creative billing options (e.g. volume based charging) GPRS is a gateway to 3G for operators and equipment vendors Real, immediate revenue opportunities Efficient migration to next generation technologies Mobile Internet Summary

2/7/01 DRAFT Confidential & Proprietary Information, Copyright 2001, Symmetry Communications Systems p. 20 Thank You Symmetry Communications We Make the Internet Mobile