A Delay Tolerant Network Cache Clearing Method Based on Time Prediction and Direction Acknowledgment

Abstract

The invention discloses a cache cleaning method based on time prediction and directional acknowledgement for a delay tolerant network. By fusing an active cache cleaning strategy with a passive cache cleaning strategy, the method realizes the efficient cache cleaning of a redundant copy of a data packet in the delay tolerant network. Active cache cleaning cancels an invalid copy by using a TTL (transistor-transistor logic) degradation mechanism. In passive cache cleaning, through leading in a transmission control mechanism based on the time prediction and the directional acknowledgement, the validity of the cache cleaning is improved, the time delay of the cache cleaning is decreased, the consumption of a bandwidth and a storage space caused by the multi-copy transmission of acknowledgement information is reduced, and the quick and efficient cache cleaning is realized. When different delay tolerant network models have different requirements on the service quality of the cache cleaning, the method can obtain better network performance through adjusting a transmission scheme in a directional acknowledging mechanism. The method has high practicality and a wide application range, and promotes the utilization rate of the limited cache in the delay tolerant network.

Description

technical field [0001] The invention relates to a cache cleaning method in a delay-tolerant network, more particularly, to a delay-tolerant network cache cleaning method based on time prediction and directional confirmation. Background technique [0002] The architecture of the Delay Tolerant Network (DTN) comes from the research on the Interstellar Internet, that is, the deep space communication technology in a high-delay environment; it was formally proposed by K.Fall and other scientists at the ICIR conference in 2002, and IRTF defined it as "Latency and interruption tolerant interoperable networks". DTN supports the interoperability of various regional networks, can tolerate long delays in regional networks and between networks, and converts between communication characteristics of various regional networks. [0003] In a delay-tolerant network, due to the limited cache space of nodes, how to efficiently use the limited cache space to achieve more data transmission has ...

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Problems solved by technology

[0004] Since the delay-tolerant network connection is easily broken and the connection time is short, the confirmation mechanism of the traditional network model cannot well realize the cache cleaning of the delay-tolerant network

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