The channelization codes have a fixed spreading factor, SF = 16. This enables a
maximum of 15 parallel codes for user traffic and signaling while leaving one for
other required control and data bearers. Although the available HS-PDSCHs are
primarily shared in the time domain, it is also possible to share the code resources
using code multiplexing, in which case several users share the code resources within
the same TTI, as shown in Figure 14.4. Multi-code transmissions are allowed:
multiple channelization codes (HS-PDSCHs) can be assigned to the UE in the same
TTI, depending on the UE capability. The same scrambling code sequence is applied