Research And Implementation Of RRC Layer Idle Mode In LTE-A Pro Test Terminal System

As an LTE-A Pro system that leads LTE towards 5G communications,through the continuous evolution of key technologies of the original LTE system.And the features it supports have the characteristics of the 5G innovation technology can ensure the widening of the bandwidth used by terminal devices,while making the communication needs of large-data-volume networked devices become a reality.Due to the unique features of the LTE-A Pro system,the overall function of the protocol stack in the implementation of the terminal equipment has been adjusted accordingly.As the control center of the entire protocol stack,the RRC layer plays an important role in the development of terminal protocol stack.Moreover,the terminal's functional characteristics in idle mode are the preconditions for terminal communication to be realized.And research and implementation of the related functions of the idle mode of the RRC layer of the test terminal system has been made an indispensable part in implementing the terminal development process and has an important research significance.This title is based on Chongqing's innovation major topic special project “Research and Development and Application of 5G Terminal Analog Devices” and “Research on key Technology of LTE-A Multi-UE Base Station Load and Capacity Testing”,focusing on the research and implementation of the functional process of idle mode of RRC layer in LTE system and NB-IoT system from the perspective of protocol software development.In the specific realization of the project,this thesis researched the protocol architecture of RRC Layer protocol standard in LTE-A Pro system,and based on the functional requirements in the subject,this thesis complete the functional process analysis in the idle mode of the RRC layer.Secondaly,this thesis introduced the main function and important process of the RRC layer idle mode in detail.And then the interaction interface between RRC(Radio Resource Control)layer and other layers of the LTE-A Pro system is designed and primitive defined,and the state division and state transition design of the RRC layer,design function names,and internal implementation of the function are handled in detail.Then use VS2010 coding software to use C language to write the RRC layer function code,and in the end to the RRC idle mode of the functional process of the test verification work.In the test verification phase,the main functions of the RRC layer idle mode have been verified by multiple test cases.Breakpoint debugging is performed on the basis of system startup and operation,the process parameter processing process in the monitoring function and the signal stream and data stream transmission process in the information communication process,and finally 100% of the test cases are passed through multiple debugging and correction processes.Meanwhile,the correctness of the research work on the interface,data structure,and process design of the terminal system and the consistency with the protocol standard were verified.