Design And Implementation Of RRC Idle State In LTE-A Terminal System

With the development of communication technology,it unfolds a great upsurge in LTE(Long Term Evolution)network deployment on a worldwide scale.As a continuation of it,LTE-Advanced has great advantages in enlarging the network coverage area,improving the efficiency of spectrum efficiency and other aspects.Only the quality and performance of LTE-A terminals which have been fully ensured can bring users the better experience.And reselection are the embodiment of mobile terminal mobility control.Besides,superior performance is the basis of the terminal to be better.Therefore,it has great significant todo the research of cell seletion and reselection.This thesis relies on the "Research on Key Technologies of LTE-A muti UE base station load and capacity test" project,which aims to test the impact resistance of eNodeB.On the basis of further study of RRC sub-layer,it focuses on the process of cell selection and reselection,including the design and implement of which in the view of RRC(Radio Resource Control)sub-layer protocol software development.In the research phase,the main research processes include cell selection,cell reselection,system messages,paging message and random access.In the design phase,first of all,the finite state machine is designed to meet the requirements of the interface between the layers and the process control of the RRC sub-layer,which can effectively realize the management of L3(Layer 3).Secondly,based on the protocol stack architecture and requirement analysis,the inter layer interaction primitives and the corresponding functions are designed.At last,the process from null to idle and cell reselection are designed.In the implementation phase,combined the research with the design,L3 of the protocol stack is developed in PC.In the test phase,test cases are written using TTCN-3(Testing and Test Control Notation version 3)language.And in this thesis,the design and implementation are verified in the following two aspects: on the one hand,the correctness of parameters is verified through the actual operation;on the other hand,the correctness and effectiveness of the design process are verified through the test platform has been built in the project.The test results show: cell reselection processes in the same frequency,different frequency,and different systems are all met the design requirements,meanwhile,and the 33 test cases in the test platform are 100% passed.In a word,the two test methods verify the correctness and the protocol conformance of the functions of the RRC sub-layer in the idle state,showing the reliability of the cell seletion and reselection developing code of terminal RRC sub-layer.