The content-rich multimedia streaming will be the most attractive services in the next-generation networks. With function of distribute data across multipath end-to-end paths based on SCTP's multihoming feature, concurrent multipath transfer SCTP (CMT-SCTP) has been regarded as the most promising technology for the efficient multimedia streaming transmission. However, the current researches on CMT-SCTP mainly focus on the algorithms related to the data delivery performance while they seldom consider the background traffic factors. Actually, background traffic of realistic network environments has an important impact on the performance of CMT-SCTP. In this paper, we firstly investigate the effect of background traffic on the performance of CMT-SCTP based on a close realistic simulation topology with reasonable background traffic in NS2, and then based on the localness nature of background flow, a further improved retransmission algorithm, named RTX_CSI, is proposed to reach more benefits in terms of average throughput and achieve high users' experience of quality for multimedia streaming services. 1. Introduction The content-rich multimedia streaming, such as video-on-demand (VoD) [1, 2] and Internet Protocol Television (IPTV) will be the most attractive services in the next-generation networks. Most researches have proved the Stream Control Transmission Protocol (SCTP) will be the most promising technology for the large bandwidth consumption of multimedia streaming services [2–4]. Particularly in the future wireless heterogeneous network that the terminals will be equipped with multiple network interfaces and attached multiple heterogeneous access capability at the same time, the SCTP can provide the effective transmission for multimedia streaming services and balance the overhead among multiple access networks. The SCTP [5] has been proposed and standardized by the Internet Engineering Task Force (IETF) in order to effectively utilize the multihoming environment and support real-time signaling transmission over IP networks, since SS7 has been the only bearer for the signaling traffic in telecommunication networks [6] for many years. SCTP has some important features including: multi-homing. The destination nodes can be reached under the several IP addresses (multi-homed). In SCTP, both sides of the association provide multiple IP addresses combined with a single SCTP port number [7]. Multistreaming which means the parallel transmission of messages over the same association between sender and the receiver. The stream independently carries fragmented
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