3G Tutorial Brough Turner & Marc Orange

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3G Tutorial
History and Evolution of Mobile Radio
Evolving Network Architectures
Evolving Services
Applications
Business Models


Cellular Mobile Telephony
Frequency modulation
Antenna diversity
Cellular concept
Bell Labs (1957 & 1960)
Frequency reuse
Typically every 7 cells
Handoff as caller moves
Modified CO switch
HLR, paging, handoffs
Sectors improve reuse
Every 3 cells possible



First Generation
Advanced Mobile Phone Service (AMPS)
US trials 1978; deployed in Japan (’79) & US (’83)
800 MHz band — two 20 MHz bands
TIA-553
Still widely used in US and many parts of the world
Nordic Mobile Telephony (NMT)
Sweden, Norway, Demark & Finland
Launched 1981; now largely retired
450 MHz; later at 900 MHz (NMT900)
Total Access Communications System (TACS)
British design; similar to AMPS; deployed 1985
Some TACS-900 systems still in use in Europe


Second Generation — 2G
Digital systems
Leverage technology to increase capacity
Speech compression; digital signal processing
Utilize/extend “Intelligent Network” concepts
Improve fraud prevention
Add new services
There are a wide diversity of 2G systems
IS-54/ IS-136 North American TDMA; PDC (Japan)
iDEN
DECT and PHS
IS-95 CDMA (cdmaOne)
GSM


DECT and PHS
Also based on time division multiple access
Digital European Cordless Telephony
Focus on business use, i.e. wireless PBX
Very small cells; In building propagation issues
Wide bandwidth (32 kbps channels)
High-quality voice and/or ISDN data
Personal Handiphone Service
Similar performance (32 kbps channels) Deployed across Japanese cities (high pop. density)
4 channel base station uses one ISDN BRI line
Base stations on top of phone booths
Legacy in Japan; new deployments in China today