It 802 d_mobile_communicationsSomeHistory
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It 802 d_mobile_communicationsSomeHistory



History of cellular and other mobile systems

History of cellular and other mobile systems



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It 802 d_mobile_communicationsSomeHistory It 802 d_mobile_communicationsSomeHistory Presentation Transcript

  • IT 802D Mobile Communications Debasis Das
  • History of   Mobile Systems-1
    • 1958: A-Netz system in Germany, 160 MHz, analog, connection set up from mobile station, no hand off possible
    • 1979: B-Netz, 160 MHz carrier, analog, high powered transmitter & receivers in cars
    • 1979: Nordic mobile telephone(NMT), 450 MHz, carrier, analog
    • 1986: NMT, 900 MHz system
    • 1982: pan European system planned, Groupe Speciale Mobile (GSM) group was formed, targets
    • carrier of 900 MHz, roaming throughout Europe
    • fully digital, to offer voice and data service
  • History of Mobile Systems-2
    • 1980: Cordless home phones, CT0
    • 1983: Advanced Mobile Phone system deployed in US, Analog, 850 MHz
    • 1984: Cordless phone CT1 implements in US
    • C-Netz, 450 MHz, analog. Handover between cells implemented, digital signalling (SS7), automatic localization of mobile users within a network was possible, offered additionally fax, data transmission via modem, X.25 and electronic mail
    • 1987: CT2 comes along, 
  • History of Digital Mobile Systems-1
    • 1991: fully digital "digital European cordless telephone"(DECT) implemented, 
    • 1880-1900 MHz, range 100 to 500 meters
    • 120 duplex channels could carry 1.2 Mbps data
    • voice encryption & authentication built-in
    • System supports several 10,000 users/sq. km
    • adopted by 110 countries
    • now called digital enhance communication system
  • History of Digital Mobile Systems-2
    • 1991: GSM standardized
    • Now known as Global System for Mobile Communication
    • 900 MHz carrier, 124 full duplex channels, international roaming, automatic location service, authentication, encryption on wireless link, inter operation with ISDN system, relatively high audio quality
    • Short messaging service, 160 characters, fax group 3, data services at 9.6 Kbps
    • More than 70% of service providers in 190 countries have adopted the GSM
  • History of Digital Mobile Systems-3
    • Systems that evolved alongside AMPS in the US during the 90's were
    • IS-88: narrowband analog AMPS, TIA 1993a
    • Is-136: digital, TDMA system, 1900 MHz, TIA 1996
    • IS-95:  digital, CDMA system, 1900 MHz, TIA 1993b
    •   GSM for 1800 MHz, aka DCS-1800
    • In the US the system available is known as GSM-1900 or PCS-1900
    • 1998: iridium: mobile communications through satellites,66 satellites in LEO, 1.6 GHz band, first version conbined GSM and CDMA
    • 1998: Europeans agree on UMTS, the European proposal for IMT-2000
  • History of Digital Mobile Systems-4
    • 2002: IMT-2000, 2.4 GHz band, includes a frameworks for services, network architecture including satellite network, strategies for developing countries, requirements for the ardio interface,  spectrum considerations, security and management frameworks and different transmission technologies.
  • History of Digital Mobile Systems-5
    • 2000: higher data rates and packet oriented transmission for GSM(HSCSD, GPRS) arrived
    • 2001: 3G arrives in Japan with FOMA services(Freedom of mobile multimedia access), several field trial in Europe, CDMA2000 in Korea
  • WLAN History-1
    • 1996: ETSI standardizes HIPERLAN(high performance radio local area network)
    • HIPERLAN1: 5.2 GHz, 23.5 Mbps, 
    • .
    • HIPERLAN4: 17 GHz, 155 Mbps
    • 1997: IEEE 802.11, License free industrial, science and medical band (ISM) of 2.4 GHz and infra red bands, 2 Mbps initially then up to 10Mbps
    • 1999: IEEE 802.11b, 11 Mbps, 2.4 GHz
    • WAP & iMode of Japan came about around this time
    • 2000:IEEE 802.11a, 5 GHz, 54 Mbps
    • 2002: IEEE 802.11g, 2.4 GHz, 54 Mbps
  • WLAN History-2
    • 1999: Bluetooth, short range personal network, up to 1 Mbps
    • 2002: Bluetooth applications started appearing such as headsets, remote controls, wireless keyboards,hot syncing, etc.