Design And Implementation Of EMM-layer In The LTE-A Pro Of Test Terminal System

With the continuous evolution of Long Term Evolution?LTE?technology,LTE-A Pro?Long Term Evolution Advanced Professional?technology is well known as an evolutionary technology for the transition from the 4^th generation mobile communication?4G?to the 5^th generation mobile communication?5G?.LTE-A Pro has introduced new technologies such as NB-IoT?Narrow Ban Internet of Things?and LAA?Licensed Assisted Access?,Which not only can meet the increasing demand for business traffic,but also can meet the need of lower energy consumption.In order to promote the coordinated development of network equipment and terminal equipment,it is important to develop a suitable LTE-A Pro test terminal system to complete the testing of network-side radio resource management capabilities.The thesis is based on the "Key Technologies for LTE-A Multi-Base Station Load and Capacity Testing" and "Development and Application of 5G Terminal Analog Devices." The purpose of the project research is to develop test terminal equipment to simulate a large number of users and test the maximum capacity and performance of the network to cope with different communication scenarios.In the stage of development and implementation,implementing the mobility management function of the terminal is particularly important for realizing the registration of a large number of users and the terminal performance testing under the registration status,and it also lays a soild foundation for the next generation of terminal simulation research.Based on this,the paper designs and implements the EMM?EPS Mobility Management?sub-layer of LTE-A Pro test terminal system according to the project requirementis.And mainly designs and implements the functional process.The main research contents include:Terminal attach process,NAS?Non-Access Stratum?security,Tracking area update process,Terminal initiated de-attach process,and Terminal initiated control plane data transmission.In the design part,interaction interface,primitive design and state division a nd design of the EMM entity are done mainly based on combing topics and Terminal Protocol Standards as theoretical foundation and according to its interaction interface and primitives,the primary functional process and primitive interactions of EMM are designed.In the implementation part,based on the project requirements and goals,the purpose computer?PC?is selected as the development and operationg environment and in combination with the design part,the relevant process of the EMM sub-layer is implemented using the C language that is more suitable for the programming process,and the function implementation form is used to complete the above process to implement the LTE-A Pro test terminal EMM sub-layer protocol software.At the same time,the code of design and implementation is under the system-level operation and the typical mobility management process is under breakpoint debugging,and the processing parameters of process in the function are monitored.Through multiple breakpoints,the verification test process of code correctness and consistence of the protocol are done.