From what you have said, i understand that :
– there is only one DL TBF per user whatever the number of application the user is required from the MFS.
– there is a lot of UL TBF per user (at the same time as the DL TBF ) which are used for ACK/NACK
– For one DL TBF, each ACK message is sent in one UL TBF, others UL TBF are carrying other ACK message of different DL TBF
PLZ correct me if i am wrong