Design And Implementation Of 5G Terminal System Radio Resource Control Layer Idle State

The 5th Generation mobile communication technology(The 5th Generation mobile communication,5G)realizes the true interconnection of everything by connecting massive machine terminal devices.Ensuring that the 5G terminal system resides in the cell,receives system information,and quickly accesses the network is an important part of the process of developing the 5G terminal system and improving the performance of the 5G terminal system.The radio resource control(Radio Resource Control,RRC)layer,as the control center of the access layer and non-access layer in the 5G system,cannot be ignored in the development of the 5G terminal system.At the same time,the idle state of the RRC layer is an important process to improve the stability of the 5G terminal system and improve the system performance.With the support of the "Development and application of 5G terminal simulation equipment" project,this article conducted an in-depth study of the idle state of the RRC layer of the 5G system,and designed,implemented,and tested the related functions.The main work and innovations of this article are as follows:1.Combined with the 3rd Generation Access Partnership Project(3GPP)standard,this paper has completed the research and design of the RRC layer idle state process.This includes the design of PLMN selection,cell selection and reselection,paging,and cross-platform transmission mechanisms with other layers.In the design scheme,minimize signaling interaction.At the same time,in order to improve system stability,a timer module is designed.2.Combined with the overall design of the 5G terminal system,the RRC idle state processing functions and interaction primitives are implemented on the PC general-purpose machine,and the design and implementation of possible abnormal situations are carried out.According to the design of the auxiliary module,the library module and the multi-thread are used to implement the timer module,and the timer module designed and implemented can be used for each layer of the protocol stack.According to the realization of the function of the idle state of the RRC layer,it shows that the design of the idle state of the RRC layer conforms to the 3GPP protocol standard.3.For the realization of RRC idle state,this article tests and verifies the implemented function code.A total of 56 test cases have been designed and executed in this paper.The designed test cases cover normal and abnormal situations.Through multiple improvements and optimizations to the code,the final design achieves the RRC layer idle state that can meet the requirements in the requirements analysis,conforms to the protocol standard consistency,and the pass rate of test cases reaches 100%,while the RRC layer idle state involves the system The information can be decoded correctly.It shows that the functional design of RRC idle state,system stability and the correctness of ASN.1 decoding module in this paper are consistent with the consistency of 3GPP protocol standards.