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WCDMA DPCH(Downlink dedicated physical channel)


This tutorial section on WCDMA (UMTS) basics covers following sub topics:
UMTS Tutorial  UMTS channels  measurements  PHY layer  TDD vs FDD PHY  RRC States  Security  Cell search  Bands  UARFCN  Frame 


This page describes DPCH or downlink dedicated physical channel with respect to WCDMA/UMTS system.

There is only one type of downlink dedicated physical channel, which is known as the Downlink Dedicated Physical Channel (downlink DPCH). Within one downlink DPCH, dedicated data generated at Layer 2 and above, i.e. the dedicated transport channel (DCH), is transmitted in time-multiplex with control information generated at Layer 1 (known pilot bits, TPC commands, and an optional TFCI).

WCDMA downlink DPCH

Channel coding- CRC, convolutional code, Turbo code (according to Qos) in DPDCH
Symbol rate- 7.5/15/30/60/120/240/480/960 ksps
Spreading factor- 4/8/16/32/64/128/256/512
Modulation- QPSK
Spreading- OVSF codes
Scrambling Gold sequence- 3.84Mcps, 10 ms periodic
Power control period- 0.625 ms
Pilot symbol- included
TFCI bits- included
TPC bit- included

WCDMA UMTS RELATED LINKS

UMTS Network Architecture
UMTS Protocol Stack
UMTS Logical, Transport and physical channels
UMTS Spreading,scrambling and modulation
WCDMA MO CS call
WCDMA PS Call
CDMA vs GSM
WCDMA Compressed mode

RF and Wireless Terminologies


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