Design And Implementation Of Power Communication Terminal Based On Link Aggregation Technology

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).It mainly deals with the mobile Internet applications business requirements in remote monitoring power transmission system.It completes the design and realization of electric power communication tenninal based on multi-link aggregation and gives the overall design scheme of multi-mode aggregation terminal based on the embedded Linux platform.The terminal uses ARM Cortex-A8 processor S5PV210 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,link monitoring and other functions.At last,the results show that the terminal can support several network modes and improve the bandwidth and stability of communication.Further more,it can work consistently in high and low temperature environment for a long time.The thesis is devided into six 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 design requirements of the system and gives scheme of the multi-mode aggregation terminal.The system is divided into 3 parts:control center,multi-mode aggregation terminal and data monitoring terminal.The multi-mode aggregation terminal scheme introduces the function of each part and refines the design of each module.In Chapter 3,the hardware development platform of multi-mode aggregation communication terminal based on ARM Cortex-A8 processor is introduced.Including the embedded tile system customization and transplantation as well as 3G communication module,4G communication module,WiFi wireless network card driver transplantation.In Chapter 4,the software design scheme mainly involved in the division of' the program function module,multi-thread meclianis and its code implementation.It based on socket communication and threads cooperate with each other to realize the data receiving,data processing,data transmission and management,link monitoring function.In Chapter 5,it focuses on the realization of multi-link aggregation algorithm in data transmission thread.It takes load balancing algorithm based on HashMap and the weighted polling as an example.According to the real scene,the weighted polling dynamic load balancing algorithm is finally selected and optimized.In Chapter 6,the actual test environment of multi-mode aggregation communication terminal is set up and the detailed test scheme and results are given.The test results show that the development of the multi-mode aggregation communication terminal can work stability and effectively enhance the transmission bandwidth to complete video transmission.