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Performance Improvements of mSCTP-CMT in Ubiquitous Network Scenarios

With the rapid development of wireless broadband services and the steady advancement of ubiquitous network, there is a rising demand for multi-homed network sites to provide services. Mobile Stream Control Transmission Protocol (mSCTP) is ideal to provide vertical handover (VHO) feature by enabling a mobile client to freely switch between IP addresses acquired in different networks. Concurrent Multipath Transfer with mSCTP's multi-homing support (mSCTP-CMT), which is the extension of mSCTP protocol, simultaneously transmits new data from a source host to a destination host via two or more end-to-end paths. This paper proposes bandwidth estimation extension and congestion control modifications for mSCTP-CMT to improve the transmission throughput in ubiquitous network scenarios. In the proposed scheme, the main contribution is that improved Non-Renegable Selective Acknowledgments (NR-SACKs) based on available bandwidth estimation and its congestion control mechanism which can efficiently utilize of send buffer, especially when frequency of loss events. From the simulation test, we can see that the performance of the proposed scheme could improve the application throughput under packet loss rate and time varied.