摘要： 采用通用微控制器实现电子收费(ETC)专用短程通信的逻辑链路控制(LLC)子层时存在功耗大、速度慢等缺点。针对该问题，通过研究ETC系统中车载单元LLC子层协议的工作原理，提出以专用逻辑电路实现LLC子层的功能，给出2种类型服务在该层的状态转换方式。利用Verilog HDL在FPGA上实现该层的功能，结果证明了该方法的有效性。

关键词: 电子收费, 专用短程通信, 逻辑链路控制, 状态分析, FPGA实现, Verilog HDL语言

Abstract: There are some disadvantages of high power dissipation, low speed and so on when the general microcontroller is used to implement the Logical Link Control(LLC) sub-layer of Dedicated Short-Range Communication(DSRC) in Electronic Toll Collection(ETC) system. By analyzing working principle of LLC sub-layer protocol of on-board unit in ETC system, this paper proposes a LLC sub-layer protocol which is implemented by specific logical circuit. The state transition modes of two types of services are presented. The function of LLC sub-layer is realized in Verilog HDL, and FPGA experimental results show the effectiveness of the method.

Key words: Electronic Toll Collection(ETC), Dedicated Short-Range Communication(DSRC), Logical Link Control(LLC), state analysis, implementation with FPGA, Verilog HDL

中图分类号: 

• TP393.04