Performance Analysis And Research On Stream Control Transmission Protocol

SCTP(Stream Control Transmission Protocol)is designed to transport calling control signal messages over IP networks, originally proposed by IETF Sigtrans. As the research and development of SCTP protocol, certain characteristics (multi-homing and multi-streaming) are capable of broader applications, SCTP not only inherits some successful mechanisms of TCP, more over SCTP remedies the some defects of TCP, hence, IETF employ SCTP as general purpose transport protocol. This article aims to study the features of multi-streaming and multi-homing, put forward the optimization scheme, and expands the properties, which can provide better performance in the network transmission.Firstly, this paper studies the background and history of SCTP development, then briefly introduces the novel characteristic and packet format of SCTP which is different from previous transport-layer protocol, connection established and closed, link management. Mainly analyzes the multi-homing and multi-streaming features of SCTP. According to the deficiencies existing in multi-homeing feature of SCTP, method is pointed out. In SCTP rules, there is only one active path to transport data. Other paths are only used as standby paths for fault tolerance. Aiming at resolving the defect of SCTP, this article proposes two strategies to improve performance, strategy one is to choose the path with best data transmission capacity as the primary transmission path when association established, and transmits data through path switch dynamically instead of the idea of a single permanent primary path throughout the association. A better performance improvement is the transmission of SCTP load sharing, during data transmission, several links with high transmission capacity is preferred to transmit data in the connected associations. In order to measure the max transmission capacity of every link, the scheme employs the available link bandwidth as basis. Aiming to obtain bandwidth algorithm with better convergence which is test available, this paper analyzes the conventional test available bandwidth algorithm, relies on the SLoPS principle, and combines three sub-algorithms (defined bandwidth range algorithm, approaching bandwidth value algorithm and prediction of bandwidth fluctuation tendency algorithm) for link available bandwidth.With NS simulation environment, modify the C++ implemented code which is SCTP related in NS, compile script and simulate the optimization scheme which is proposed in the paper, process the experiment data. The final results verify that improved SCTP provide dramatic performance of reducing missing packet on data transmission, shortening the time cost of congestion process.The studying to the feature of SCTP multi-streaming and strategy of performance improvement play critical part in promoting the research on SCTP theory and application.