Research Of Reliable And Efficient Data Transmission Protocol Based On UDP

With the rapid development of Satellite communication technology and terrestrial communication technology,and the continuous advancement of the national infonnatization construction process,space-ground integration information network has gradually formed.In the space-ground integration information network,in order to uniform deploy security policies formed between different network domains,share information resources,conduct dynamic control and management,and simultaneously distribute various types of security control devices in the wide-area distribution and different levels in the pace-ground integration information network.In order to monitor and control equipment status,link status,resources and operations,linkage protection control system and inter-network security interconnection control system are designed and implemented.The core functions of the two system are the release of the policy command and the reception of the security gateway monitoring data.They have the characteristics of large amount of communication data,real-time communication and high reliability.In response to the problems of performance and reliability encountered during data transmission,this paper designs and implements a reliable and efficient data transmission protocols based on UDP.Firstly,by analyzing and summarizing the theory and technology of the existing reliable transmission protocol,and based on the actual needs of the proj ect,this paper proposes the general design idea of a reliable transmission protocol based on UDP,which implemented in the application layer.Secondly,the traditional RTT estimation algorithm is sensitive to the initial value,and the RTT estimation value is slower than the real RTT value caused by the slow convergence rate.This paper proposes an adaptive smoothing factor based on the original RTT estimation algorithm.The RTT estimation algorithm increases the response speed to RTT changes.Thirdly,in view of the security problems such as leakage and tampering that may occur during the transmission of data,this paper uses the combination of symmetric secret algorithm and asymmetric encryption algorithm to encrypt and transmit data,ensuring the confidentiality and integrity of the data.Finally,carry out the functional test and performance test of the reliable transmission protocol.The experimental results show that the protocol involved in this paper can meet the requirements of the system,realize the reliable transmission of data at the protocol level,and provides a secure,efficient and reliable data transmission service to the system.