Design And Implementation Of Vehicle Network Based On LTE-V Dual-mode Terminal Platform

Vehicular network is a major network system of wireless communication and information exchange between vehicles and X(vehicle,road,pedestrians and the Internet)that is based on inner-vehicle and inter-vehicle networks and mobile Internet and through agreed communication protocols and data exchange standards.It is an integrated network that is able to realize intelligent traffic management,intelligent dynamic information service and intelligent vehicle control.It is a typical application of the IOT technology in the field of traffic system.In recent years,much headway has been made in the advancement of the vehicle networking technology,with the simple combination of GPS+GPRS technology updated to the current V2 X direct network.This thesis designs and implements a vehicle terminal system based on LTE-V protocol.The vehicle terminal system includes software design and hardware design.The software design includes high-level application layer,physical layer,MAC layer and platform driver layer.The platform driver layer aims to meet the requirements of high reliability,support task deletion,interrupt priority,support inter core communication,unified allocation of data space and provide necessary support for physical layer,MAC layer,application layer and fast running program.Hardware design includes schematic design,PCB design and reliability design.This thesis is selected from the hardware design and platform driven development based on the LTE-V platform.The main work of the author is as follows:1)Design and simulation of the core circuit board based on the vehicle terminal.The core circuit board uses the company's own research base processor as the core basis to design the program.The high-speed transceiver is used to achieve vehicle terminal RF data transceiver control and data integrity checking and correction.DDR3 is used as the runing memory for the Internet of vehicles terminal to achieve high-speed data processing.A 7-inch LCD screen is used as the display interface of the vehicular networking terminal.The DMA is used to achieve transfer of data.And the TTlog method is used to monitor the running state of the vehicle networking terminal.2)Finishing booting of the network terminal system,completing the design,simulation and debugging of the physical layer algorithm and achievement of RF transceiver control,nuclear communication of message,DSP power-saving management,memory management and DDR3 control,DMA data transfer.3)Finishing the functional verification and integration test of the vehicle terminal system,and passing reliability test.The design is based on implementation of the LTE-V network terminal system and the experimental results show that the system has stable performance and is able to meet the LTE-V network protocol of low delay and high reliability requirements of vehicle;and it provides reference for the design of LTE-V protocol-based vehicle networking products in the future.