Optimization Design And Implement Of Multi-mode Heterogeneous Convergent Terminal Based On 4G

This research is supported by State Grid Project Research on Key Technologies of 4G multi-service for mobile Internet applications in Power Communication System(SGRIXTKJ[2015]No.349).For the business needs of remote monitoring transmission system in power mobile Internet applications,it completes the optimization design and implementation of multi-mode heterogeneous fusion terminal in the remote monitoring system and gives the overall optimization design of multi-mode heterogeneous fusion terminal based on the embedded Linux platform.The terminal uses ARM Cortex-A9 processor Exynos 4412 of real-time embedded Linux operating system.By transplanting driving module and compiling Linux kernel,the 3G,4G and WiFi network equipment is supported.The software platform is written based on socket communication technology,which includes data receiving and delivering,data processing,link communication resource management and other functions.It also realizes the video data encoding and decoding,transmission and display functions,remote monitoring and transmission.At last,the results show that the terminal can support multi-mode network heterogeneous fusion and remote video transmission,realize the optimization of multi-mode communication terminal.The thesis is divided into 6 chapters as follows.In Chapter 1,background and significance of the research is introduced as well as main work together with the architecture of each chapter.In Chapter 2,it analyzes the functions and disadvantages of multi-mode communication terminals in existing remote monitoring transmission systems.Based on analysis it designs overall optimization schemes of multi-mode heterogeneous fusion terminals.In Chapter 3,the hardware development platform of multi-mode heterogeneous fusion terminal based on embedded development platform is introduced,including embedded Linux system kernel customization and transplantation as well as 3G and 4G communication module,WiFi wireless network card driver transplantation.In Chapter 4,the software optimization design scheme mainly involved in control center,multi-mode terminal and data monitoring terminal.According to the function modules,it introduces the realization of data receiving,data processing,network resource management and data sending.In Chapter 5,it designed and verified the video transmission function.According to comparison of mainstream codec mode,it selects the most suitable coding standard and codec for the system and realizes the coding compression,video transmission and decoding in the video monitoring.In Chapter 6,the actual test environment of multi-mode heterogeneous fusion terminal is set up and the detailed test scheme and results are given.The results verify the optimization about network convergence and video data transmission of multi-mode heterogeneous fusion terminal.