Find a TFC for the data waiting in this UE, or return NULL on failure. Also return the logIdMap which is the logical channel to be applied to each TrCh. Note: A failure indicates the data in the UE did not match any TFC. In the general case, this could happen because because data is not ready on synchronized channels, for example, for AMR data, there is data in one sub-rab flow but not the others.
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