DTN (Delay/Distribution Tolerant Network) buffer memory management system and method based on message sharding and node cooperation

Abstract

The invention discloses a DTN buffer memory management system and method based on message sharding and node cooperation. A node historical movement record module transmits a node movement record and a message m to an address coupling module; the address coupling module calculates the coupling probability between the node movement record and a target address of the received message m, and if the coupling probability is greater than a threshold, the message m is transmitted to a buffer memory replacement module; when the buffer memory replacement module determines whether the length of the message m is lower the residual buffer memory of a node, if yes, the message m is stored in a corresponding queue, and if no, when the message m is an entire message and the buffer memory of the node is greater than 1/2 the length of the message m, the message m is transmitted to a message sharding module, and the otherwise, buffer memory of the message m is replaced; the message sharding module divides the message m; and a message recombination module recombines the divided messages. The method and system can effectively utilize buffer memory of the node, and improve the message transmission efficiency.

Description

technical field [0001] The invention belongs to the field of wireless mobile networks, and in particular relates to a delay-tolerant network cache management system and management method based on message fragmentation and node cooperation, which are applied in a buffer-constrained environment. Background technique [0002] Delay / Disruption Tolerant Network (DTN, Delay / Disruption Tolerant Network) is a new type of network, which does not have the characteristics of low delay, high transmission rate and reliable connection of traditional networks. The intermittency of connection, time-varying topology, high latency, high error rate, and low transmission rate of delay-tolerant networks determine that it cannot use the "store-and-forward" routing protocol in traditional networks, and can only use "store-carry-forward" The routing mode relies on the movement of nodes in the network to forward messages. Therefore, how to design a cache management method to make full use of the li...

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Problems solved by technology

[0005] (1) When the node cache is insufficient, only relying on some characteristics of the message to replace, regardless of the matching degree between the moving track of the message carrying node and the destinat

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