What is transport format combination in umts?

So confusing with transport format, transport format set ?

The fact: Several transport channels can be multiplexed in a single physical channel.

So, transport format combination (TFC) defines the number of transport blocks that are transmitted from each of the multiplexed transport channels in a given TTI.

Example:

DCH1:

{10ms, turbo coding, static rate matching parameter =1}

{40 bits, 40 bits}

DCH2:

{10ms, convolutional coding, static rate matching parameter =3}

{320 bits, 320 bits}

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