Research On Reliability Of File Transmission In One-Way Transmission System

Internet provides human being society a platform to acquire real time informat ion quickly since it came to the world, bringing the risk of information reveal for those computers which linked Internet at the same time. Technician developed One-way transmission system helping high- level network securely got information from low- level network, for the sake of high- level network leaked the security data during it getting real time information. It is impossible to make sure the file transmission reliable because of the O ne-way transmission system followed the rule of one-way file transmission without feedback. Important real-time information during transmission once lost will cause serious consequences. Therefore, reliability of One-way transmission system had become a bottleneck restricting its market development. This paper analyzes and studies on the one-way file transfer reliability problems, proposed to increase the one-way transmission reliability program.The main work of this paper is the experimental study and analysis of packet loss problem for one-way transmission system. Using C RS erasure codes to improve the reliability of the one-way transmission based on the conclusion of packet- loss. And it optimized the coding efficiency of one-way transmission system.This dissertation made some experiments aimed at research the packet- loss phenomenon of One-way transmission system, obtaining the conclusions as follow:1. The probability of packet- loss was getting lager and lager as the transmission rate grown. 2. There was some relationship between transferred packet-size and packet- loss rate. It turns out that there was an ideal region made the packet- loss the smallest. Packet-loss would be acutely grown due to IP datagram recombination while packet size was not in the region. 3. Crowd packet- loss that with high probability of continuous packet-loss had Markov relation.This dissertation proposed using C RS erasure code instead of RS erasure code, we concluded that the use of CRS erasure codes can greatly improve one-way transmission fault-tolerance at the expense of bandwidth resources by the practical experiment.Finally through algorithm analysis and experimental results demonstrate the following four steps: 1. generation matrix is optimized for CRS. 2. Select the appropriate size of the data buffer and encoding buffer. 3. Select the actual demand(n, m, w) code combinations. 4. Calculate the optimal packet size based coding combinations. CRS encoding efficiency can be improved.