Research And Implementation Of Signaling Decoding System For LTE-A Air Interface Analyzer

With the rapid development of mobile communication network and popularization of intelligent mobile phone,people's mounting requirements for diversify of data business type lead to the explosive growth of mobile terminal business data.Faced with so many network problems arising from it,operators usually choose to use communication network monitoring analyzer to analyse index of network from multi dimension,locate the faults and manage centrally,which can improve users' experience.The thesis relies on major national science and technology special project “New generation broadband wireless mobile communication network”,aimed to the poor real-time,scalability,and flexible access in traditional monitoring analyzers,researched and developed a signaling decoding system for LTE-A air interface analyzer.The main research work of this thesis is as follows:(1)Based on the theoretical research on LTE-A network architecture,Uu interface and L3 protocol,clear the function requirements of the analyzer,put forward the framework design of the signaling decoding system for LTE-A air interface analyzer.(2)According to the framework design scheme,the thesis divided the system into data dispatch module,signaling decoding module,multi-protocol correlation module and output tabular module.Firstly,identify control plane data and user plane data through the design of data packet interface.Then parse RRC protocol and NAS protocol through simple decoding and detail decoding to get its key information and detail information.And next analyse important correlate identification to realize cross layer data correlation through backfilling,so as to acquire the users' detail communication records.Finally save the records in CSV format.(3)According to the relevant protocol standards formulated in 3GPP,validate the correctness of the result fields and analyse the result.Compare the multi-protocol correlation result with single message to verify its reliability and validate the correctness of the output tabular information.(4)Research on the influential factors on real time in data processing to improve the processing speed.Verify the accuracy of decoding error rate through protocol test.Analyse the system stability through constructing the evaluation model combined with relevant indicators and its scalability according to the design principle.After testing and analysis,we can see that the system can deal with the collected data in real time,the correct rate of decoding is up to 100%,and the stability is quite well.Up to now,the signaling decoding system designed in this thesis has been successfully applied to LTE-A air interface analyzer and runs stably and effectively in the actual monitoring.It provides effective support for maintaining network construction and optimizing user experience.