Design And Implementation Of Hardware-in-the-Loop Simulation Platform For Lte Protocol Stack Based On OAI

The first real 4G technology specified by 3GPP is Release10,which is the cornerstone of current mobile technology.And LTE Release 15 was officially released in 2017,marking the completion of the first phase of 5G standardization.Particularly,TDLTE is dominated by China and has received extensive international support and has become an international standard.In 2014,China formulated the B-TrunC broadband trunking communication standard based on TD-LTE.The broadband trunking communication system of TD-LTE has the incomparable advantages of other broadband communication technologies in the autonomy of system development.Therefore,TDLTE technology has been gradually introduced in industries such as public safety,police systems,water conservancy systems,transportation,and petrochemical industries.The LTE protocol standard is updating and needs to be quickly commercialized.The LTE private network research requires not only LTE technology,but also needs to add special services.For example,the LTE cluster private network needs to add the cluster channel and the control and management for the channel.These tasks require simulation verification and testing.The results of software simulation mainly depend on the quality of the mathematical model,and there may be a large deviation from the real situation.This thesis builds a hardware-in-the-loop simulation platform of LTE protocol stack based on OAI source code.The hardware-in-the-loop simulation platform can provide a protocol stack conforming to LTE standard,and its data packets are transmitted between real network elements.The LTE protocol simulation research can be tested based on the hardware-in-the-loop simulation platform,and the private network research and test can also be performed based on the platform.The hardware-in-the-loop simulation platform inlclude three parts: eNB,UE,and EPC.The eNB and UE of the hardware-in-the-loop simulation platform are designed and implemented based on the openairinterface5 g project in OAI.The EPC part is from the openair-cn project of OAI.The main work of this thesis is:(1)Analyzing the OAI source code,and associate the OAI project with the network elements and protocol stack of the LTE system,analyzing the OAI layer interaction and the physical layer implementation of the UE and the eNB network element in the OAI in detail,and temporarily assume that the OAI does not implement the cell handover.(2)Design and implement a physical adaptation layer module,which completes the function of the UE and the eNB network elements communication with Ethernet.(3)Design and implement two network elements of the UE and the eNB.The implementation of these two network elements is based on the OAI source code,and the main modification part is the UE physical layer and the eNB physical layer of the OAI.The test results show that the hardware-in-the-loop simulation platform designed and implemented in this thesis can be successfully attached to the core network of OAI.The control plane and data plane can communicate,which proves that the design and implementation of the hardware-in-the-loop simulation platform is basically feasible.The research results of this thesis provide a platform for testing and experimentation for the subsequent development of the project.