Text of different generation of wireless communication
1.
2. ..is the transfer of information over a distance , without the use of electrical conductors/wires. 3. 4. 5. Mobile radio telephone systemspreceded modern cellular mobile telephony technology.These systems are sometimes retroactively referred to aspre cellular(or sometimesZeroG eneration ) systems. First Mobile Radio Telephone-1924 6. Used analog radio signal. Introduced in 1980s Uses FDMA The various standards-- 7.
As Its AnalogSo It Was Highly Susceptible To Noise
Traffic Was Not Encrypted So Anyone Could
Eavesdrop By Tuning To The Correct Frequency
8. 2 GWireless The technology of most currentDIGITALmobile phones-TDMA + CDMA Features includes: - Phone calls - Voice mail - Receive simple TEXT messages Speed:10kbits/sec Time to download a 3min MP3 song: 31-41 min 9. Different variants of2 G GSM (TDMA) IS-95 CDMA one PDC (TDMA) iDEN (TDMA) IS-136 D-AMPS 10. 11. 12. The Best Technologynowwidely available Features includes: -camera phones - high speed packet data -GPRS - Send/receive large email messages - Web browsing - Navigation/maps - New updates Speed:64-144kb/sec Time to download a 3min MP3 song: 6-9min 13.
Features include:
I-MODE DATA SERVICE.
CAMERA PHONES.
HIGH SPEED CIRCUIT SWITCHED
GPRS
EDGE
14. 2 Gnetworks were built mainly forvoice dataandslow transmission . Due to rapid changes in user expectation, they do not meet today's wireless needs. Cellularmobile telecommunications networks are being upgraded to use 3G technologies from1999 to 2010 .Japanwas the first country to introduce 3 Gnationally, and in Japan the transition to 3 Gwas largely completed in2006 .Koreathen adopted 3 GNetworks soon after and the transition was made as early as2004. 15. 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/sec Time to download a 3min MP3 song: 11sec-1.5min 16. 17. 18.
UMTS - This Is Main3 G Technology That UsesWCDMA ..
WCDMA (WIDEBANDCODEDIVISIONMULTIPLEACCESS)
WCDMAis the higher speed transmission protocol in theUMTS
system
Radio channels are 5MHz wide.
Supports two basicmodes of duplex :
frequency division and time division(15 slots/radio frame).
Multiuser detection can be used to increase capacity and coverage
-operators likeVODAFONE, SINGTEL, AT&T, TIM.
19. 20. 21. 22. 23. 24. 25. 26.
Data Communications And Networking- B. A. Forouzan
