Research And Implementation Of Terminal Identity Information Acquisition Scheme In 5G NSA

In today’s society,5G technology has become the new focus of the communication field in recent years with its characteristics of high speed,low latency and large connections,but the conversion process from 4G to 5G is not as smooth as previous generations of communication technology.Due to the high cost of communication equipment and some limitations of 5G technology development,some special network architectures with NSA have been invented.With the upgrading of communication technology,communication security is also facing greater challenges.For some communication security technology,obtaining terminal identity information is an essential link.Therefore,this project proposes a terminal identity information acquisition scheme specifically for 5G NSA Option 3X network architecture.Firstly,this paper analyzes various architecture modes of 5G NSA,then analyzes the characteristics of these architectures and their application in real life in detail,and determines that terminals under Option 3X network architecture in NSA are taken as the target of obtaining terminal identity information in this topic,and a scheme based on mode three interference principle is proposed to solve the problem of terminal adsorption.Secondly,the IMSI acquisition process under 5G NSA Option 3X network architecture is studied.Starting from the terminal access process,the function of IMSI and its signaling process in the access process are studied,then determine the scheme of using signaling that named Identity Request to obtain IMSI information under Option 3X network.Finally,this project used the software radio platform to build the simulation system of this topic,and modified the codes of relevant modules in the Open source platform of Open Air Interface to realize the function of obtaining identity information.In view of the implementation process of the scheme,the most important three issues of system parameter configuration,RRC establishment and identity authentication are designed.Using the existing modules in the open source platform and some modules modified by the subject to form a complete system that realize the design requirements of the subject.then,the final verification proves that this topic can obtain the IMSI of terminals under the Option 3X network architecture of 5G NSA.