Wireless Oom

Let us consider the case of spreading factor 256.
Remember that each slot has 2560 chips.
2560/256 = 10 symbol can be sent in each slot.
For uplink case, remember that DPDCH and DPCCH are code multiplexed. Here 1 symbol is divided into I and Q component. Thus, 1 symbol can convey 1 bit for uplink case (with [...]

Uplink:
uplink transmission is continuos and changes in bit rate can be achieved by modifying the spreading factor of the code sequence being used.
Downlink:
Spreading factor is chosen to support the highest bit rate of TFCS.
The variable bit rate is implemented with discontinuous transmission (DTX), swithcing off the transmission during the DPDCH fields in certain time slots.