A probabilistic retransmission scheme with link-state-dependent packet scheduling in wireless networks

The wireless environment is unstable. The transmission link always bursts into errors, which makes the head packet fail to be transmitted. This paper gives the fact that choosing the queue with bad error link to transmit the packet will bring about the Head Of Line (HOL) problem: the blocked head packet would make the rest postpone to be sent The HOL problem occurs frequently because of the unstable state of the link. This paper proposes a new probabilistic retransmission method to solve this problem. The simulation results show that the proposed algorithms can remove the packets from the bottleneck node and can improve the throughput of the networks.