An Energy Efficiency Based Message Forwarding Method in Delay Tolerant Networks
A message forwarding and message technology, applied in data exchange networks, digital transmission systems, electrical components, etc., can solve problems such as computational complexity, inapplicability to a large number of nodes, etc., and achieve the effect of reducing energy consumption
Active Publication Date: 2017-06-16
NANJING UNIV OF POSTS & TELECOMM
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However, the Markov model is not suitable for a large number of nodes due to its computational complexity
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[0029] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0030] The present invention provides a message forwarding method based on energy efficiency in a delay-tolerant network, such as figure 1 shown, including the following specific steps:
[0031] Step 1, suppose there are two communities V in the network 1 and V 2 , with N 1 and N 2 nodes, at the same time, there is a source node S and a destination node D, and the probability that the source node S and the destination node D will transmit a message after contact is p 0 = 1; the life cycle of the message is E t , the lower limit of message transmission success rate is D p , the upper limit of the number of copies of message delivery is L, and the number of copies K of message delivery that satisfies the above conditions and minimizes energy consumption is calculated:
[0032]
[0033] In the formula, lambda in is the contact rate betwee...
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The invention discloses an energy-efficiency based message forwarding method for tolerant network. The method is characterized in that the number of copies of messages which meet the conditions and are of small energy consumption is calculated and selected according to the contact rate of network nodes and the probability of message delivery and other information under the conditions that two cells are developed in the tolerant network and social selfishness is shown, wherein the activeness of the nodes and the optimal number K of the copies of the message delivered from a source node to a target node are calculated, then the number of the copies of the message to be forwarded, of the source node is set to be K+1, namely, the message can be copied into K+1 numbers to the maximum; when any node that carries the message meets another node that does not carry the message, and the number of the copies of the message carried by the node exceeds 1, the copies are distributed according to the activeness of the nodes; otherwise, the message cannot be forwarded until meeting the target node. According to the message forwarding method, the number of the copies of the message is limited so as to lower down the energy consumption in message delivery.
Description
technical field [0001] The invention relates to a message forwarding method based on energy efficiency in a delay-tolerant network, belonging to the field of delay-tolerant networks. Background technique [0002] A 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 Epidemic protocol was proposed by Amin Vahdat and David Becher. It is a typical representative of the opportunistic forward...
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IPC IPC(8): H04L12/701
Inventor 吴家皋朱义吉刘林峰
Owner NANJING UNIV OF POSTS & TELECOMM