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 [...]
The MAC layer generates a new transport block every 10-ms (or multiple of blocks.)
A set of simultaneous transport blocks is the transport block set.
The transmission time interval (TTI) is the duration of each transport block set.
This can be 10, 20, 40, 80 ms.
TTI does not tell you data size. It tells you how often the [...]
The transport channel is a concept applied to the interface between the physical layer and the MAC layer.
All transport channels are unidirectional.
The physical layer operates in 10-ms time slices in the connected mode (HSDPA case: 2-ms).
The data is sent using transport blocks.
