Wireless Oom

PI (Paging indication)
is
a short indicator that is transmitted on the PICH to tell the UE that there is a paging message on an associated paging channel carried by the SCCPCH.
The number of PIs per radio frame (Np) can be 18, 36, 72 or 144.
Once the UE knows paging occasion (SFN), then the UE needs to [...]

Transport channels care about how and which characteristics the data from MAC layer are transmitted through the radio interface.
It is not about what information which logical channels take care.
Thus, two main categoires: (1) dedicated and (2) common
1. Dedicated
DCH (Dedicated Channel):  DCH includes either user or control information.
In the case of single service, a usual situation [...]