The content-rich multimedia streaming will be the most attractive services in the next-generation networks. With function of\r\ndistribute data across multipath end-to-end paths based on SCTP�s multihoming feature, concurrent multipath transfer SCTP\r\n(CMT-SCTP) has been regarded as the most promising technology for the efficient multimedia streaming transmission. However,\r\nthe current researches on CMT-SCTP mainly focus on the algorithms related to the data delivery performance while they seldom\r\nconsider the background traffic factors. Actually, background traffic of realistic network environments has an important impact on\r\nthe performance of CMT-SCTP. In this paper, we firstly investigate the effect of background traffic on the performance of CMTSCTP\r\nbased on a close realistic simulation topology with reasonable background traffic in NS2, and then based on the localness\r\nnature of background flow, a further improved retransmission algorithm, named RTX CSI, is proposed to reach more benefits in\r\nterms of average throughput and achieve high users� experience of quality for multimedia streaming services.
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