The Research And Implementation Of The Key Technology Of Special Small Base Station ENodeB System

As a representative of the fourth generation mobile communication system,Long Term Evolution has achieved great success in the public commercial field.With the continuous development of mobile communication systems,LTE technologies have become more mature and have begun to be applied in other fields,especially in private networks and specific usage scenarios,which have great potential for development.Based on the research of the eNodeB system in LTE network,A method is designed to get the IMSI number as the identity identification in the special scenario of UE identity information identification in this thesis.By designing and implementing a small base station eNodeB with a dedicated function to provide an LTE network service for a customized terminal,the identity of the non-custom terminal of the public network is identified.The key technologies of dedicated small base stations studied in this thesis are identity identification technology and connection rejection technology for public network users.The main contents are summarized as follows:1.The needs of dedicated small base stations is analyzed after researched the development status of base stations.Introduces the architecture and the software protocol stack of the LTE network,the system messages and major system processes is analyzed.The LTE theory related to identity technology implementation is introduced.2.The small base station under the special scenario of UE identity recognition is designed with reference to the standard network structure of LTE network and the system composition of eNodeB.Based on the structural design and functional division of dedicated small base stations,a complete eNodeB system is implemented using the LTE software protocol stack,the 9131 RDB baseband processing board,and the Benedel RF daughter card.3.The system theory of the key technology of identity recognition is studied,the theory about cell reselection and TAU is introduced and the method to achieve identity identification is designed in the above scenario.The implementation scheme of triggering TAU under the same frequency cell reselection is designed.Next,according to the implementation requirements for obtaining the IMSI plaintext number,a signaling procedure for reporting the IMSI plaintext number by the TAU under the dedicated small base station identity identification usage scenario is designed,and relevant NAS messages such as Identity Request and TAU Reject used in the signaling flow are designed.4.The test scheme for the basic function of the base station and the overall test of the identification is designed.In the test section,many test tools including Iperf are used to build a complete set of test environment.Finally,the test results that meet the expectations were obtained and a reasonable analysis of the test results was given.