Downlink Physical Channels
There are three physical channels in the downlink; the primary and secondary Common Control Physical Channels (CCPCH) carry the downlink for the common control logical channels (BCCH, PCH and FACH); the SCH provides timing information and in WCDMA is used for handover measurements by the Mobile Station (MS).
The dedicated channels
(DPDCH and DPCCH) are multiplexed, however this means that there is an
EMC problem caused by discontinuous transmission, but this is not
considered a significant problem to the downlink, for two reasons :