Cache-based network coding has been proposed recently as an effective method to improve retransmission efficiency. In this way, the receiver will cache the encoded packets that cannot be decoded rather than delete. However, some cache-based methods neglect the overlap relationship among encoded packets or cached encoded packets. In this paper a new cache-based network coding retransmission scheme in wireless communication networks (CNCR) has been proposed, in which the buffer list of failed encoded packets at the receiver will be updated by simplifying the cached encoded packets according to their overlap relationship. Furthermore the special case " the cross relation " has been introduced, the requested packet in this case will be retransmitted immediately, and the fast decoding of encoded packets cached in the buffer list can be realized. Finally the simulation results show that CNCR can improve the recovery efficiency, and have apparently superiority to previous works proposed.
Network coding for wireless communication networks