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Seminar - An Overview of Communications Technologies


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Module 9 - Wireless Systems and Technologies                                                                                 Slide 19 of 80                                                                                                    ________________

                              Evolution of Terrestrial Mobile Wireless Systems

 


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Mobile Wireless networks are evolving at a lightening pace to meet customer demands for multi-media and the Internet applications.

First-Generation (1G) systems were analogue, circuit switched, poor voice links, low capacity, hand-off unreliable with no security. 1G systems are not deployed any more. In some areas 1G system spectrum is being auctioned for 2G and 3G systems.

Second-Generation (2G) systems are digital. GSM and D-AMPS are examples of 2G systems. 2G networks are used around the world. 2G technology supports high bit rate voice and limited data communications.

Third-Generation (3G) systems support data rates in M bps range and are intended for applications other than voice. 3G networks are deployed in Europe and North America.

Fourth-Generation (4G) systems will support applications requiring very high speeds. 4G system standards are under development and the 4G networks will be deployed in 2010+.

Mobile Generations Mobile Technology Theoretical Data Speeds Actual Data Speeds Forecast Data Speeds (2006)
1G Analogue
FDMA		      
2G GSM 14.4 K bps 7 - 9.6 K bps       -
High Speed Circuit Switched Data (HSCSD) 36.6 K bps 20 K bps 30 K bps
Personal Digital Cellular (PDC) 64 K bps 10 - 20 K bps      -
CDMA) 64 K bps 10 - 20 K bps      -
3G Universal Mobile Telecommunications Service (UMTS) 2 M bps 40 K bps 200 K bps
4G OFDM 20 - 54 M bps Not Expected Until 2010+