Research And Implementation Of High-speed LTE Communication Based On Single Chip Platform

With the rapid development of electronic technology and Internet technology,the demand for intelligent hardware is increasing.In most intelligent hardware,the functions of network communication and data transmission are essential.It is an important part of the Internet communication industry to use the embedded system with the single chip as the core to carry on the network communication.With the rapid development of mobile wireless network technology,LTE has become very mature,not only widely used in smart phones,but also in various smart hardware.Due to the demand for large-scale deployment of intelligent hardware,cost control has become an indispensable link.On the low-cost single-chip microcomputer platform,the computing performance and memory size are greatly limited,and it is more difficult to run the network protocol stack.In this thesis,the hardware circuit of the MCU combined with the LTE data transmission module is designed and implemented,and the driver including the PPP protocol and the USB protocol is implemented in the software to form an LTE communication system for wireless network communication.When the performancelimited single-chip microcomputer runs the network protocol stack independently and conducts TCP communication,due to the lack of computing resources and memory resources,the problems of low transmission rate and insufficient real-time performance will occur,and the direct increase in configuration consumption and cost is huge,which does not meet the low cost.power consumption requirements.Therefore,this thesis studies and analyzes the factors that affect the data transmission rate and system real-time performance in the memory management of the network protocol stack,and proposes an improved optimization scheme with low cost and low power consumption.This research is based on an improved memory swap method based on DMA+FLASH external memory.Aiming at the problem of insufficient real-time performance caused by the limited performance of single-chip microcomputer,an application-level double buffer design is implemented on the lightweight TCP/IP protocol stack Lw IP,and the system blocking time is improved.In order to improve the real-time performance of the system;in view of the insufficient transmission rate caused by the limited performance of the single-chip microcomputer,the core-level double-cache design is implemented to improve the data transmission rate;finally,the application-level and core-level are integrated,and a further improved fusion double cache is proposed.Design,while improving the system real-time performance and data transfer rate.The experimental results show that under the condition of controlling power consumption and cost,the application-level double cache improves the real-time performance of the system,which can reduce the blocking time to 12%,and the core-level double cache design can increase the data transmission rate to 413%.Double buffering can reduce blocking time to 3% and increase data transfer rate to 350%.The double-buffer design can significantly improve the performance of the single-chip LTE communication,which has high use and reference value for the design of low-cost wireless intelligent hardware.