C04-Wireless_Telecommunication_Systems

C04-Wireless_Telecommunication_Systems - Mobile...

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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.1 Mobile Communications Chapter 4: Wireless Telecommunication Systems ± Market ± GSM ± Overview ± Services ± Sub-systems ± Components ± DECT ± TETRA ± UMTS/IMT-2000
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.2 Mobile phone subscribers worldwide year Subscribers [million ] 0 200 400 600 800 1000 1200 1400 1600 1996 1997 1998 1999 2000 2001 2002 2003 2004 approx. 1.7 bn GSM total TDMA total CDMA total PDC total Analogue total W-CDMA Total wireless Prediction (1998)
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.3 Development of mobile telecommunication systems IS-136 TDMA D-AMPS GSM PDC GPRS AMPS NMT IMT-TC TD-SCDMA EDGE 1G 2G 3G 2.5G IS-95 cdmaOne IMT-DS UTRA FDD / W-CDMA IMT-TC UTRA TDD / TD-CDMA cdma2000 1X 1X EV-DV (3X) IMT-SC IS-136HS UWC-136 CT0/1 CT2 IMT-FT DECT FDMA TDMA CDMA IMT-MC cdma2000 1X EV-DO HSDPA
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.4 How does it work? ± How can the system locate a user? ± Why don’t all phones ring at the same time? ± What happens if two users talk simultaneously? ± Why don’t I get the bill from my neighbor? ± Why can an Australian use her phone in Berlin? ± Why can’t I simply overhear the neighbor’s communication? ± How secure is the mobile phone system? ± What are the key components of the mobile phone network?
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.5 GSM: Overview GSM ± formerly: Groupe Spéciale Mobile (founded 1982) ± now: Global System for Mobile Communication ± Pan-European standard (ETSI, European Telecommunications Standardisation Institute) ± simultaneous introduction of essential services in three phases (1991, 1994, 1996) by the European telecommunication administrations (Germany: D1 and D2) Î seamless roaming within Europe possible ± today many providers all over the world use GSM (more than 200 countries in Asia, Africa, Europe, Australia, America) ± more than 1.2 billion subscribers in more than 630 networks ± more than 75% of all digital mobile phones use GSM (74% total) ± over 200 million SMS per month in Germany, > 550 billion/year worldwide (> 10% of the revenues for many operators) [be aware: these are only rough numbers…]
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.6 Performance characteristics of GSM (wrt. analog sys.) Communication ± mobile, wireless communication; support for voice and data services Total mobility ± international access, chip-card enables use of access points of different providers Worldwide connectivity ± one number, the network handles localization High capacity ± better frequency efficiency, smaller cells, more customers per cell High transmission quality ± high audio quality and reliability for wireless, uninterrupted phone calls at higher speeds (e.g., from cars, trains) Security functions ± access control, authentication via chip-card and PIN
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Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 4.7 Disadvantages of GSM There is no perfect system!!
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This note was uploaded on 02/28/2008 for the course CSCI 6360 taught by Professor Wu during the Spring '08 term at University of Texas at Dallas, Richardson.

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C04-Wireless_Telecommunication_Systems - Mobile...

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