單向鏈路下高可靠數據傳輸方法研究
[Abstract]:In order to completely eliminate the leakage of information in secret networks, one-way link communication without feedback has become a feasible physical isolation technology in the field of network security. However, because unidirectional links have only one-way transmission capability, the reliability of data transmission can not be ensured by answering mode in this environment. In order to meet the communication requirements of high security network, the reliability of one-way transmission has become a key problem to be solved in one-way isolation technology. In this paper, the unidirectional communication link is designed by using the general components of the network, and the system protocol is designed on the basis of analyzing the udp protocol, combining with the key technologies such as Erasure Code, PFRINGand one-way communication, etc. Different one-way control strategies are designed based on different transmission rates. After continuous testing, the final goal of one-way import, high-speed transmission, security isolation, reliable transmission is achieved. The specific research work is as follows: 1. The correlation between data transmission rate and packet loss rate in unidirectional link is studied. With the change of transmission rate, packet loss rate also changes obviously. Based on this correlation, this paper proposes two different one-way control strategies. The one-way transmission is within the bandwidth range of the link. Due to the device or circuit and other factors there is still a certain proportion of packet loss. The packet loss is random and has no correlation with each other. In this paper, an adaptive coding scheme based on maximum rate is proposed, which adopts unidirectional control mechanism based on ErasureCode algorithm at low packet loss rate, and adjusts the coding strategy based on maximum rate estimation. The redundancy check is established between the transmission packets, and the redundant data packet is restored to .3. with the increase of the transmission rate, the packet loss rate increases rapidly, and congestion packet loss begins to appear. Only using erasure coding to improve the fault-tolerance can not achieve the ideal effect. In order to resist the bad recovery performance of erasure coding to the phenomenon of continuous packet loss, the interleaved coding between transmission groups based on erasure coding is adopted in this paper, and the discrete distribution of continuous packet loss will be distributed to different groups of packets. Furthermore, the fault-tolerant performance of erasure codes is improved. The two one-way control strategies mentioned above are tested under the actual link packet loss environment and the Gilbert network packet loss model. The test results show that the one-way control strategy can further reduce packet loss rate in unidirectional link environment with different rates, improve the fault-tolerance of one-way transmission, and achieve high reliability of data transmission in unidirectional link. Based on the relationship between packet loss rate and transmission bandwidth in unidirectional link communication, this paper proposes a rate-based one-way redundancy control strategy, which provides a solution to how to ensure the high reliability of one-way link communication. It has important theoretical significance and research value.
【學位授予單位】:北京郵電大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TP393.08
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