The Design And Implementation Of Software Defined Data Link Layer Based On ZC706 Plantform

The background of the research content of the thesis comes from the research project " Key Technology of New Generation Broadband Ad Hoc Network System",which is jointly organized by the research group and a research institute of China Electronics Technology Group.The main objective of the project is to design a new generation of broadband mobile access and self-organizing interconnected wireless networks,which can be used to serve a variety of differentiated user services at the communication node,and flexibly customize the corresponding radio access network(RAN)for various services.Due to the single rigid rigidity of the traditional communication infrastructure,it is urgent to construct a software-defined radio access network to flexibly adapt the differentiated requirements in real time through the radio access network slicing.In this paper,first,the RAN slicing system is designed based on the idea of software defi-nition.First,define its own description information for each RAN slice,to obtain the state information of the slice in real time,and establish a global information view to manage each slice.Then,the control logic of each sub-layer of each slice link layer is abstracted,and the data transmission function parameters of each layer are controlled by establishing a control interface.Secondly,the research and design of the software-defined RAN link layer protocol is com-pleted.For the Long Term Evolution(LTE)radio access network link layer,the Packet Data Convergence Control(PDCP)layer,the Radio Link Control(RLC)layer,and the Medi-um Access Layer(MAC)Layer three sub-layer functions for research and analysis,and the RAN slice link layer PDCP layer security function,header compression function,RLC lay-er three transmission modes,MAC layer random access and resource scheduling and other core functions The package is designed to be a callable function that provides the basis for differentiated customization of each slice function based on performance requirements.Finally,the filtered-orthogonal frequency division multiplexing filter(F-OFDM)technique is applied to divide the given spectrum into sub-bands of different parameter sets and map to the corresponding RAN slices.On the wireless communication platform formed by the Xilinx Zynq-7000 SoC ZC706 hardware development board and the AD9361 RF develop-ment board,the F-OFDM technology is used to divide the wireless spectrum applicable to the FTTP service and the Video service,and the virtual machine system is constructed to match it.Software-defined slices for business delivery.In summary,this paper studies and analyzes the general LTE radio access network,and virtualizes the network functions of the link layer and each layer in the form of software to facilitate the call of each slice,further for each slice.The logic control is abstracted,and the control interfaces of each layer of the slicing network are designed,so that the system can centrally control it.Finally,the F-OFDM technology is applied to the wireless communication hardware development platform,and the RAN slicing system that meets its specific needs is built for different business scenarios.