Research On Partial Path Transmission And Retransmission Policies For CMT

With the improvement of Internet, end-to-end communication protocol based on transport layer singlehoming such as TCP and UDP are challenged in aspect of transmission performance, fault tolerance and security. The emergence of end-to-end communication protocol with transport layer multihoming such as SCTP-based CMT (Concurrent Multipath Transfer) greatly improved the end-to-end throughput and network resources utilization.In the multi-path (more than two) under the premise of CMT, CMT that using all the path transfer data has less performance than CMT that using two path of all the existing CMT retransmission policies can not handle very well with the problem of "receive buffer blocking" for the lack of comprehensive consideration with n performance parameters. Improvement of the CMT end-to-end throughput has been constrainted by this problem.Corresponding solutions was analysed in this paper about these two issues in-depth and points out the corresponding solutions:(1) Because CMT that using all the path transfer data has less performance than CMT that using two path of all. This paper get a new solution that is CMT-PP(CMT-Partial Path),based partion path transmission of CMT, only half of path is used to send data in the new solution, Others is used to data of retransmission under the premise of multiple paths (more than two)(2) did changes to the CMT retransmission mechanism against the problem of the existing CMT retransmission policies and proposed RTX-RTTCWND based RTX-CWND, So the receive buffer blocking problem is reduced to some extent.Finally, the summary of the subject was gived and outlook the research work of future was outlooked in the paper.