Research On Quality Control Technology Of Data Transmission Of P2P In Near Field Communication

With the major smart phone manufacturers increasing the NFC chip in their mobile phones,NFC technology integrates into people's lives.At present,there are still some problems in NFC,such as low efficiency and lack of security,In this thesis,the technical characteristics of NFC and the relevant technical standards proposed by NFC forum are analyzed,the transmission protocol,the transmission of large files and the security of data transmission are studied.Firstly,the thesis analyzes the protocol standard and protocol of P2 P mode,combined with the practical application,studies the efficiency of the small files transmission in NFC P2 P mode.Based on the traditional SNEP(Simple NDEF Exchange Protocol),the thesis proposes a P2 P data transmission method based on connectionless service,which reduces the time consumption,and the reliability transmission mechanism is added to ensure the reliability of data transmission.Then,according to the communication requirements,a transmission scheme selection strategy is proposed to balance the three aspects of compatibility,file size and reliability.Finally,the effectiveness of the improved method is verified by comparing with the experimental results.Secondly,the thesis makes a research on the large file transfer of peer to peer,and analyzes the deficiency of the SNEP standard developed by NFC Forum in the transmission of large files.In the segment transmission of larger file,the flow control strategy is added,which can improve the transmission efficiency.In addition,a connection oriented data responsing method is improved,add the dynamic response mechanism based on the use of connectionless data transmission,to ensure the reliability of the data at the same time,improves the efficiency of data transmission,and gives the implementation process.Finally,the experimental platform is built.Through the experiment,the efficiency of the improved protocol is improved by 56% when the transmission environment is good,and the efficiency is improved by 15.6% when the transmission environment is poor.Lastly,some problems in the security of point to point transmission are analyzed,a kind of lightweight security method is proposed for the low-end embedded devices,which can prevent the third party from attacking and losing information,and improve the security of data transmission.The above research work can solve the problem of low efficiency of NFC peer to peer protocol transmission data,and has a certain reference value for the application of NFC point to point transmission.Dynamic role change method can improve the security of data transmission,and has some practical value for the private data transmission between the low-end embedded devices.