关键词: 计算机科学技术基础学科, 拥塞, 马尔可夫相遇时间间隔, 排队方式, 丢弃机制

Abstract: In order to solve the problem of the low delivery ratio caused by the limited resources in DTN, routing mechanism based on multiple copies is usually used to improve the delivery ratio, the following problem is the overload of nodes buffer caused by the excessive numbers of copies, then network congestion happens. This paper proposes the congestion control strategy based on Markov meeting time span prediction model CCSMP, it mainly specified the line method and discarding mechanism of nodes buffer, the predicted messages meeting earlier with destination node are lined in the first, and discard the messages with lower utility values as far as possible, then solve the congestion problem caused by the limited node buffer. Through the simulation in ONE environment, compared with the two kinds of congestion control strategy Drop-Front( DF) and Drop-Oldest( DO), the experimental results show that the congestion control strategy proposed by this paper improves the message delivery ratio, and reduces the average network delay, and to a certain extend reduces the overhead ratio and packet dropped rate.

Key words: Basic disciplines of computer science and technology, congestion, Markov meeting time span , line method , discarding mechanism