Channel mapping diagram [Under LTE >
3G till Rel 6]
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With the introduction of shared downlink channels (HS-DSCH), both signaling and data bearers can be mapped to HS-DSCH, leaving only (uplink) power control for DPCH. To better the utilisation (of downlink channelisation codes), a shared physical channel, F-DPCH (Fractional Dedicated Physical CHannel) was introduced in Rel 6. F-DPCH is used for both HSDPA and HSUPA.
Find below modified channel mapping diagram (click on image to see enlarged version) for Rel 6 (Rel 5 channel mapping diagram can be found in related UMTS article).
References: 3G Evolution: HSPA and LTE by Dahlman, Parkvall, Sköld, and Beming and Release 6 document at 3gpp.
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