different generation of wireless communication
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..is the transfer of information over a distance , without the use of electrical conductors/wires.
Mobile radio telephone systems preceded modern cellular mobile telephony technology. These systems are sometimes retroactively referred to as pre cellular (or sometimes Zero
Generation) systems.
First Mobile Radio Telephone-1924
Used analog radio signal.Introduced in 1980’sUses FDMA
The various standards--
As Its Analog So It Was Highly Susceptible
To Noise
Traffic Was Not Encrypted So Anyone Could
Eavesdrop By Tuning To The Correct
Frequency
2G WirelessThe technology of most current
DIGITAL mobile phones-TDMA + CDMA
Features includes:- Phone calls- Voice mail- Receive simple TEXT messages
Speed: 10kbits/secTime to download a 3min MP3 song: 31-41 min
Different variants of
2G
GSM(TDMA)
IS-95CDMA one
PDC(TDMA)
iDEN (TDMA)
IS-136D-AMPS
The Best Technology now widely available
Features includes:- camera phones- high speed packet data- GPRS- Send/receive large email messages- Web browsing- Navigation/maps- New updates
Speed: 64-144kb/secTime to download a 3min MP3 song: 6-9min
Features include:
I-MODE DATA SERVICE.
CAMERA PHONES.
HIGH SPEED CIRCUIT SWITCHED
GPRS
EDGE
2G networks were built mainly for voice data and slow transmission. Due to rapid changes in user expectation, they do not meet today's wireless needs.Cellular mobile telecommunications networks are being upgraded to use 3G technologies from 1999 to 2010. Japan
was the first country to introduce 3G nationally, and in Japan
the transition to 3G was largely completed in 2006. Korea
then adopted 3G Networks soon after and the transition was
made as early as 2004.
Combines a mobile phone, laptop PC and TV
Features includes:- Phone calls/fax- Global roaming- Send/receive large email messages- High-speed Web- Navigation/maps- Videoconferencing- TV streaming- Electronic agenda meeting reminder.
Speed: 144kb/sec-2mb/secTime to download a 3min MP3 song: 11sec-1.5min
UMTS- This Is Main 3G 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.
Data Communications And Networking- B. A. Forouzanwww.Wikipedia.comwww.nmscommunications.comwww.mobilealliance.comEncarta Encyclopedia