Single service loop for all MAC entities. I am not using the prevWriteTime/nextWriteTime paradigm that was used in the GSM code because: 1. We no longer have a complicated table to lookup the next write time slot, we just send data every TTI period. 2. Especially for packet data we dont care if we miss a slot, we just want to send on the next future opportunity. 3. The encoder class is not quite
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