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Licklider协议(Licklider transmission protocol,LTP)是一种主要应用于空间网络的点到点传输协议,可用于空间网络相邻节点间的数据传输。LTP可靠传输通过返回确认和重传实现。空间网络节点间距离长,多个往返轮次的确认和重传过程造成极大的传输延迟。该文给出了一种传输轮次的形式化分析方法,其结果包含传输轮次的分布函数、期望和方差。另外提供了一种基于上下界的方法,给出了形式非常简洁的结论,其结果包含轮次期望的上下界和近似值。然后通过典型例子的仿真计算和比较验证了相关结论。
The Licklider transmission protocol (LTP) is a point-to-point transport protocol that is mainly used in space networks and can be used for data transmission between adjacent nodes in a space network. LTP reliable transmission through the return confirmation and retransmission. Space network node long distance, multiple rounds of acknowledgment and retransmission caused great transmission delay. In this paper, we present a formal analysis of transfer rounds, the result of which contains the distribution function, expectation and variance of the transfer rounds. In addition, a method based on upper and lower bounds is provided, and a very concise form is given. The result includes upper and lower bounds and approximations of the expected roundness. Then we verify the relevant conclusions through the simulation and comparison of typical examples.