Research On Data Retransmission Technology Of Wireless Sensor Network Based On Multi-packet Decoding

With more widely application of the wireless network in people's lives,the reliability of the data transmission in wireless networks demands increasingly accurately.Data often appears wrong or misses during the transmission,the source node needs data retransmission,the traditional retransmission method is ARQ(Automatic Repeat reQuest),that is as long as the source node receives the information of packet loss from the receiving node then retransmits,too much retransmission make the network congestion.Network coding was born in 2000,it increases the amount of information in every data retransmission,as well as makes outstanding contributions to reduce the number of data retransmission.The wireless broadcasting retransmission approach based on network coding(NCWBR),multi-packet decoding and network coding based broadcasting retransmission(MDNCBR)and so on,they reduce the number of packet retransmission in a certain extent,but they still have poor practicability in large-scale sensor networks environment.In view of the advantages and disadvantages of these methods,this paper will research data retransmission technology based on network coding furtherly,the purpose is to improve the performance of data retransmission method,to create high quality transmission environment for wireless sensor networks.The specific research contents are as follows:Combining with multiple packet decoding technology,this paper puts forward the multi-packet decoding data retransmission based on same string splitting scheme in wireless sensor network(MDRSSS)and multi-packet decoding data retransmission based on selection optimization scheme(MDRSOS),and presents the process of the specific encoding and decoding.MDRSSS method splits the same string before encoding and removes the redundancy between the two decoding packets.It is helpful for the receiving node decoding.With the advantages and disadvantages of MDNCBR and MDRSSS,MDRSOS absorbs the quintessence and avoids the situation that MDRSSS cannot successful decode in one time.The simulation results show that the MDRSSS reduces the redundancy of the MDNCBR,improves the quality of the retransmission encode packet and reduces the average number of retransmission.The MDRSOS increases the network throughput furtherly.Through theexperimental results and analysis,we find that the number of receiving nodes,sending packets and the loss probability of receiving nodes are the main factors influencing the number of retransmission.The higher three kinds of influence factors are,the more obvious advantages MDRSSS and MDRSOS have.Therefore,we can come to the conclusion that MDRSSS and MDRSOS have the feasibility and superiority.They are more suitable for the complex wireless sensor network environment with the large nodes number and high packet loss probability through the experimental results and the analysis.