Multi-User Dynamic (Re)transmission Scheduler for OFDMA Systems

The challenge of our work is to enhance the effectiveness of packet retransmission in multi-user OFDMA based communication systems. Based on information theory, we propose a retransmission scheduler (re-scheduler) that recomputes the allocation of chunks for negatively acknowledged packets only when correct packet decoding is impossible or it requires a too large number of retransmissions. Our proposal is compatible with any classical priority packet scheduling algorithms. Simulation results show that our solution permits to avoid useless retransmission scheduler activations and to enhance the overall resource allocation performance in terms of both residual PER and maximum achievable cell capacity.