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UMTS Multiple Access Network


This tutorial section on UMTS basics covers following sub topics:
Main Page  Architecture  Stack  channel types  Bands  UARFCN  Frame  Timers 


This tutorial on UMTS covers multiple access types used in UMTS system.

UMTS Multiple access types

UMTS uses Direct Sequence CDMA and information is spread across bandwidth in multiple ways as shown below, which derives different physical channels or air interfaces.

1. Information is spread across 1.6 MHz BW (1.28Mcps), referred as narrowband CDMA
2. Information is spread across 5 MHz BW (3.84 Mcps), referred as WCDMA
3. Information is spread across 10MHz BW (7.68 Mcps)

UMTS supports both FDD and TDD duplex modes. FDD is supported in 3.84Mcps option. TDD is supported in all the three options i.e. 1.28, 3.84 and 7.68 Mcps.

Useful Links on Multiple Access Types

FDMA-versus-TDMA-versus-CDMA
TDMA

               


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