UCL教材WCDMA-UMTS

• Second generation (like GSM) enabled voice traffic to go wireless
• In several countries there are now more mobile phones than landline
(wired) phones
• Data handling capability of 2nd generation is limited
• Third generation: should provide high bit rate services that enable
transmission and reception of high quality images and video and provide
acces to the WEB
• Third generation: referred to as UMTS (Universal Mobile Telecommunications
System)
• WCDMA (Wideband CDMA) is the main third generation air interface
in the world
• Specification created in 3GPP (Third Generation Partnership Project)
which is joint standardisation project of Europe, Japan, Korea, USA
and China.
• In 3GPPWCDMA is called UTRA (Universal Terrestrial Radio Access)
FDD and TDD
• Work for 3rd generation started in 1992 when the WARC (World
Administrative Radio Conference) of the ITU (International Telecommunication
Union) identified frequencies around 2 GHz for 3G
• Withing the ITU, 3G was named IMT2000 (International Mobile Telephony-
2000)
• The target of IMT was to have a single worldwide standard
• WCDMA will be used by Europe, Japan, Korea in the WARC-92
spectrum allocated for 3G
• In North America, spectrum auctioned for 2G. No specific spectrum
for IMT-2000