1. 2002. 12. 5 Nick(Hee-seong), Kim Software Engineer / GSM / R&D GSM team GSM–GPRS Overview

2. R&D GSM team 2 Today’s Issue GSM basic & history m GSM basic & history m GSM Principle m GSM-GPRS System architecture m GPRS Basics m GSM Trends

3. R&D GSM team 3 Contents m GSM History m Global system …. Truly ? m Evolution to the 3G m GSM-GPRS system architecture m GSM-GPRS protocol architecture m GPRS Basics m GSM-GPRS trends m References

4. R&D GSM team 4 GSM History m Trace - In 1982, CEPT * High voice quality * Low in price * International Roaming * New service * Compatible with ISDN - In 1989, ETSI - In 1990, GSM Phase I - In 1993, GSM, DCS, PCS - Five years ago, there were a few 10’s of companies

5. R&D GSM team 5 Is GSM the Global System truly ? m Global system ……truly ? - Over 139 licenses in 105 countries World wide - Approx. 80 % of the total of mobile subscribers - 650 million by 01/02. … - Over 1 billion subscribers by the year 2003

6. R&D GSM team 6 Evolution to the 3G-1

7. R&D GSM team 7 Evolution to the 3G -2

8. R&D GSM team 8 GSM-GPRS System architecture

9. R&D GSM team 9 GSM-GPRS protocol architecture

10. R&D GSM team 10 GPRS Basics m What is GPRS ? - Packet services - Work on the existing GSM Network - Also uses same GSM radio frequencies and BSS - Have been developed in GSM phase 2 + - Offers genuine packet switched bearer services - Allows data rates of 40~115kbps

11. R&D GSM team 11 GPRS Basics-2 m How GPRS works ? - Uses packet switching to transfer data from MS to Net - MS always connected and ready to send information - Also uses same GSM radio frequencies and BSS - Channels are shared in packet switched networks. (In circuit switching each CH is dedicated to only one user) - No call setup or suspend delays (immediately can send packet data)

12. R&D GSM team 12 GPRS Basics-3 m How about GPRS data rate ? - Uses time slot aggregation - Uses the design of coding scheme

13. R&D GSM team 13 GPRS Basics-4 m Time slot aggregation for GPRS

14. R&D GSM team 14 GPRS Basics-5 m Coding scheme for GPRS

15. R&D GSM team 15 GPRS Basics-6 m Network elements for GPRS

16. R&D GSM team 16 GSM Trends… m How about GSM Trends ? - GSM->GPRS->EDDE->WCDMA - cdmaOne(95A,B)->CDMA2000(1x)->CDMA2000(3x) - TDMA->EDGE->WCDMA - In case of China market, GSM is more than 80 % - In 2004, 3G will be delay to 2005~6.

17. R&D GSM team 17 GSM spec reference… m The applicable standards are available at 1. www.3gpp.org 2. “ specifications” 3. Scroll down to “Latest version” and click on the link 4. Click most recent release “Rel-5” in this case 5. Click on the desired “ series “ 6. UMTS is DS-WCDMA(25s)  Click  EGSM and DCS(45s) “25101” “45005” 3GPP TS 25.101 V5.3.0 3GPP TS 45.005 V5.4.0

18. R&D GSM team 18 The end……..^-^ Thank you ! Let’s talk about this issue….