Method for transmitting data of delay tolerant network on basis of improved transmission probability estimation

Abstract

The invention discloses a method for transmitting data of a delay tolerant network on the basis of improved transmission probability estimation. The method is characterized in that contact durations among nodes and electric quantities of the nodes are considered when the transmission probability is computed, and whether an information data packet can be successfully transmitted by the nodes under the conditions of limited bandwidths, limited contact durations and limited electric quantities or not is judged. The method includes performing corresponding judgment according to values of the transmission probability; canceling transmission if the value of the probability of transmission from a current node to a target node is larger than a value of the probability of transmission from a certain node to the target node; judging whether the information data packet can be successfully transmitted by the node under the conditions of the limited contact durations and the limited electric quantities or not if the value of the probability of transmission from the current node to the target node is not larger than the value of the probability of transmission from the certain node to the target node; transmitting information from the current node to the certain contact node if the information data packet can be successfully transmitted by the node; canceling transmission if the information data packet cannot be successfully transmitted by the node. The certain node is in contact with the current node. The method has the advantages that the contact durations of the nodes and the electric quantities of the nodes are introduced into a routing algorithm when the routing algorithm is performed, so that a next hop can be selected correctly, and the transmission success rate can be increased; the size of the information data packet is compared to the quantity of data which can be transmitted under the conditions of the limited contact durations and the limited electric quantities, so that whether the information data packet is transmitted or not can be determined, and the purpose of saving network resources can be achieved.

Description

technical field [0001] The invention relates to a data transmission method for improving transmission probability estimation, in particular to a delay-tolerant network data transmission method based on improved transmission probability estimation, belonging to the technical field of delay-tolerant networks. Background technique [0002] Delay Tolerant Network (DTN for short) is a network that lacks continuous and reliable connections between end-to-end. DTN networks often have the characteristics of high delay, low transmission rate, intermittent connection, frequent node movement, delay tolerance, error tolerance, limited storage and harsh communication environment, which makes the traditional Internet technology based on TCP / IP end-to-end communication Can't serve it well. In view of the uniqueness of the DTN network. DTN routing, as the most important part of the delay tolerant network, has become the primary research object of the majority of researchers. [0003] The...

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Problems solved by technology

However, this method ignores other factors that affect transmission performance. Node power. Node power is a problem worth considering for nodes with limited resources.

At the same time, it does not consider whether the data packet can be successfully sent within the limited contact time. If the data cannot be sent successfully, not only the transmission efficiency cannot be improved, but also the resources are greatly wasted.

[0006] In addition, the relevant literature mentioned that from the perspective of saving energy, the probabilistic routing algorithm based on node energy is used to better reduce the communication overhead of the network and prolong the life cycle of the network. This method also only considers the power factor one-sidedly. At the same time, it has not considered whether the limited power can successfully send data packets

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