According to the problem that partial path transmission is better than the full path when there is a big difference in the quality of the path in concurrent multipath transfer(CMT)environment

the fitting relationship of the path average throughput

packet loss rate and delay is established.A retransmission strategy named RTX_PW using path weight is proposed

and this strategy can decrease the receive buffer block and improve the throughput of concurrent multipath transfer.Finally

simulation results show the performance of RTX_PW outperforms that of the traditional retransmission strategies of RTX_CWND and RTX_SSTHRESH.