Downlink DPDCH and DPCCH

 Figure 6-15 shows the structure
of the downlink DPDCH and DPCCH. The most notable characteristic
is that the DPCCH is time-multiplexed with the DPDCH rather than
being transmitted separately. In each slot on the downlink, two fields contain
DPDCH user data, while three other fields maintain information on
the pilot bits, the TFCI, and the TPC. As is the case for the uplink, a number
of slot formats can be applied to the downlink DPDCH/DPCCH.
Table 6-4 shows the various combinations.
As can be seen from Table 6-4, the actual DPDCH user throughput is
dependent on the slot format used. Moreover, one can clearly see the effect
of compressed mode, where less than 15 slots are used in the downlink.