Abstract
Marine fishery production safety has always been a livelihood issue of high concern to government departments at all levels in China. With the construction of marine informatization, a large number of fishing vessels have entered the Vessel Monitoring System (VMS). The massive, highly concurrent, and continuous track data generated by these vessels has posed great challenges to real-time data distribution. To cope with low distribution efficiency in the original data distribution system, this paper proposed a data distribution model based on the combination of network coding and UDP, which improves both reliability and efficiency of data distribution. In order to further enhance the efficiency of data distribution, a Codeword Distance Priority Protocol based on Buffer Map (CDPPBM) was added to the proposed model for the concentration of innovative codewords in the network, thereby increasing the effectiveness of data received by nodes. Experimental results show that the protocol proposed in this paper improves the data distribution efficiency by about 75% on average, compared with the LT code. The influence of data block size on network coded data distribution system is not involved in the previous work. Therefore, this paper discusses the Block to Piece Protocol (BPP) for large files, divides large files into fixed sizes equally, and distributesndata blocks multiple times to find the optimal piece size. The experimental results show that there is an optimalnfor large files of different sizes, which can maximize the efficiency of data distribution.
Highlights
In this paper, a descriptive analysis was performed on the push failure of a certain enterprise fishing boat positioning push server
The fishing boat positioning push server consisted of a source node and multiple receiving nodes, in which the source node was responsible for receiving, analyzing, and storing the serial data returned by Beidou and forwarding them to multiple receiving nodes. e original system adopted the C/S data distribution model based on the TCP communication protocol
In order to solve the problem of efficiently distributing largescale, high-concurrency, and continuous fishing vessel positioning information in the actual system, this paper proposes two strategies, CDPPBM and Block to Piece Protocol (BPP)
Summary
With widespread Internet access, applications such as file downloads and video-on-demand have led to exponential growth in Internet. E application of content distribution network (CDN) [4] reduces the data transmission pressure of the backbone network, but the edge network is still a model. A random feedback digest (RFDG) model is proposed to digest redundant symbols, increase the effective information ratio in the network, and improve the efficiency of data decoding. Gkantsidis and Rodriguez first proposed the application of network coding to P2P content distribution systems. Reference [19] developed an effective packet selection mechanism, called Intelligent Packet Coding (IPC), which further improves the efficiency of content distribution based on network codes in P2P networks. Ese works have not yet involved the effect of fragment size on distribution efficiency in a data distribution system based on network coding.
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