1. GPRS General Packet Radio Service Shay Toder – Ori Matalon The Department of Communication System Engineering Ben-Gurion University June 19, 2002

2. What Is GPRS? General Packet Radio Service “2.5 generation” Completing the Voice capabilities of GSM Text capabilities of SMS Data capabilities of CSD

3. GPRS Technical Benefits Speed Immediacy Network availability Network resource and spectrum sharing Parallel to voice

4. GPRS Limitations Speed Limited cell capacity for all users Transmit delays

5. GPRS Terminal Classes Class A - two services simultaneously Class B - one service at a time Class C – one service only

6. GPRS Architecture Mobile Station (MS) Base Station System (BSS) Mobile Switching Subsystem (MSS) MSC (Mobile Switching Center) GMSC (Gateway Mobile Switching Center) HLR (Home Location Register) VLR (Visitor Location Register)

7. Security in GPRS (1)

8. Security in GPRS (2) Five main areas where security is exposed Mobile phone and SIM card Security mechanics between the MS and the SGSN The PLMNs backbone network Between the operator and other operators Between GGSN and external connected networks

9. Security in GPRS (3) SIM card International Mobile Subscriber Identity (IMSI) Individual Subscriber Authentication Key (Ki) Key Generating Algorithm (A8) Authentication Algorithm (A3 or similar) Personal Identification Number (PIN) GPRS-A5 International Mobile Equipment Identity (IMEI)

10. GPRS Billing Charging: to collect info to be able to write a bill Billing: to write a bill to the user SGSN (Serving GPRS Support Node) GGSN (Gateway GPRS Support Node) CGF (Charging Gateway Function)

11. Thanks you!