1. ..is the transfer ofinformation over adistance , withoutthe use ofelectricalconductors/wires.
2. Mobile radiotelephone systemspreceded moderncellular mobiletelephonytechnology. Thesesystems aresometimesretroactivelyreferred to as precellular (orsometimes ZeroGeneration)systems. First Mobile Radio Telephone-1924 3. Used analog radio signal.Introduced in 1980sUses FDMAThe various standards--NMT in Nordic countries-Sweden, Norway, Denmark and Finland ( ) AMPS (Advanced Mobile Phone System) inthe United States(1983) and Australia ( )TACS (Total Access CommunicationsSystem) in the United Kingdom ( ) 4. As Its Analog So It Was Highly Susceptible To Noise Traffic Was Not Encrypted So Anyone Could Eavesdrop By Tuning To The Correct Frequency 5. It was launched in the yearin FINLAND.2 G WirelessThe technology of most current DIGITALmobile phones-TDMA + CDMAFeatures includes:- Phone calls- Voice mail- Receive simple TEXT messagesSpeed: 10kbits/secTime to download a 3min MP3 song:31-41 min 6. Different variants of 2GGSMIS-95 PDCiDENIS-136(TDMA) CDMA one (TDMA) (TDMA) D-AMPS 7. GSMDIGITAL CELLULAR SYSTEMCIRCUIT SWITCH SYSTEMIS-95FIRST CDMA BASED DIGITAL CELLULARBRAND NAME FOR IS-95 IS CDMA1PDCDEVELOPED EXCLUSIVELY IN JAPANCOMPARED TO GSM,HAS A WEAKER BROADCAST 8. I-DEN DEVELOPED BY MOTOROLA CAN HAVE VIRTUALLY UNLIMITEDTALKING GROUPSD-AMPS ADDS TDMA TO AMPS TRIPLES THE NO. OF CALLS THAT CAN BEHANDLED ON A SINGLE AMPS CHANNEL 9. The Best Technology now widely availableFeatures includes:- camera phones- high speed packet data- GPRS- Send/receive large email messages- Web browsing- Navigation/maps- New updatesSpeed: 64-144kb/secTime to download a 3min MP3 song:6-9min 10. Features include: I-MODE DATA SERVICE. CAMERA PHONES. HIGH SPEED CIRCUIT SWITCHED GPRS EDGE (Enhanced Data rates forGSM Evolution) 11. 2G networks were built mainly for voice data and slowtransmission. Due to rapid changes in user expectation, they donot meet todays wireless needs.Cellular mobile telecommunications networks are being upgradedto use 3G technologies from 1999 to 2010. Japan was the firstcountry to introduce 3G nationally, and in Japan the transition to3Gwas largely completed in 2006. Korea then adopted 3GNetworks soon after and the transition was made as early as2004. 12. Combines a mobile phone, laptop PCand TVFeatures includes:- Phone calls/fax- Global roaming- Send/receive large email messages- High-speed Web- Navigation/maps- Videoconferencing- TV streamingSpeed: 144kb/sec-2mb/secTime to download a 3min MP3 song:11sec-1.5min 13. Capability To Support Circuit And Packet Data At HighBit Rates:or higher in high mobility (vehicular) trafficfor pedestrian trafficor higher for indoor trafficInteroperability and roamingCommon billing/user profiles: Sharing of usage/rate information between service providers Standardized call detail recording Standardized user profiles 14. Capability to determine geographic position of mobiles and report it to both the network and the mobile terminalSupport of multimedia services/capabilities: Fixed and variable rate bit traffic Bandwidth on demand Multimedia mail store and forward Broadband access up to 15. UMTS- This Is Main 3 G Technology That Uses WCDMA..WCDMA (WIDEBAND CODE DIVISION MULTIPLE ACCESS)-WCDMA is the higher speed transmission protocol in the UMTS system-Radio channels are 5MHz wide.-Supports two basic modes of duplex: frequency division and time division(15 slots/radio frame).-Multiuser detection can be used to increase capacity and coverage-operators like VODAFONE, SINGTEL, AT&T, TIM. 16. Audio/ Video. VOIP. Still image. Moving images. Downloading softwares. 17. Features include:- An efficient system.- High network capacity.- Huge data rate.- Smooth hand off- Seamless connectivity & global roaming.- High quality of service.-An all IP. Packet switched network.Speed: Suppose to allow data transfer up tooutdoor andindoor. 18. networks have been particularly designed toaccommodate WLANs and PANs based on Bluetoothtechnologies. suffers bandwidth limitations to accommodate thesenetworks 19. Technology 3G4GFrequency band1.8 - 2.5GHz2 - 8GHz Bandwidth 5-20MHz 15-200MHz100Mbps moving - Data rate Up to 2Mbps 1Gbps stationarySwitchingCircuit/PacketPacket 20. Data Communications And Networking- B. A.Forouzanwww.Wikipedia.comwww.nmscommunications.comwww.mobilealliance.comEncarta Encyclopedia