A transmission layer data transmission method for underwater long-delay sensor network

Abstract

The invention relates to an underwater long-delay sensor network transmission layer data transmission method. The method comprises the following steps that retransmission time RTO is set at a sendingend and is shorter than round-trip time RTT; an interval stop-and-wait data transmission mode is utilized, and a receiving end correspondingly processes feedback information of data transmitted by thesending end during kth transmission during (k+2)th transmission; the receiving end retransmits a lost data packet, and meanwhile, a new data packet in the size of a remaining transmission window is transmitted; the sending end finds corresponding retransmission time RTO when a communication system obtains the optimal redundancy elimination effective throughput according to the relational expression of RTO and redundancy elimination effective throughput by using the formula that RTO equals to argmax(gamman), and the optimal RTO retransmission time is found in limit conditions; the communication distance between nodes and the optimal RTO in actual communication are given, the optimal RTO is set to be RTO retransmission time, and at the time, the system obtains the optimal redundancy elimination effective throughput.

Description

technical field [0001] The invention relates to an underwater long-delay sensor network transmission layer data transmission method. Background technique [0002] The underwater sensor network communicates via acoustic signals. The underwater acoustic channel has the characteristics of time extension, narrow bandwidth, high noise, high bit error rate, and propagation loss; the underwater sensor node has the characteristics of mobility, large size, high energy consumption, and difficulty in replacing batteries. These characteristics make underwater A sensor network can be viewed as a delay / disruption tolerant network (DTN). Although there have been some research results on DTN, it is not suitable for underwater long-delay sensor networks. Therefore, it is urgent to solve the problem of long delay in underwater sensor networks. [0003] The main protocol of the DTN network is the bundle protocol (BP), which adopts a store-and-forward hosting mechanism. The underlying protoco...

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Problems solved by technology

[0004] In order to solve the problems of long delay and low communication efficiency of the underwater sensor network proposed above, the present invention provides a transmission layer data transmission method of the underwater long-delay sensor network, according to the different distance requirements of actual communication between underwater nodes , gives the optimal RTO retransmission time setting of the sender, so that the communication system can obtain the best effective throughput of de-redundancy

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