WCDMA DPCH(Downlink dedicated physical channel)
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).
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
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