3G W-CDMA Overview (cont.)

• DS-CDMA selected as air interface

• Two modes of operation defined:

  • FDD - for paired band
  • TDD - for unpaired band

• For FDD bands, two standards defined:

  • W-CDMA
  • cdma2000

• For TDD bands, one standard defined: TDMA/CDMA

Down link

FDD

TDD

DL

UP

DL

UP

Up link

Duplex separation

Time

Base Station

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