AFDX交换机优先级调度技术的设计与实现

Design and Implementation of AFDX Switch Priority Scheduling Technology

航空电子全双工交换以太网(AFDX)[1]是为航电信息系统之间进行数据通信而专门制定的协议标准,具有确定性、双余度和可靠性等优点,已成功应用于新一代航电网络。分析ARINC 664 Part7中交换机章节高低优先级技术特点,提出一种交换机高低优先级的设计实现。文中首先对基于RR轮询和静态优先级的非抢占式队列调度算法的优劣进行分析,在此基础上,提出基于优先度排序的调度算法。通过测试与验证,证明该AFDX优先级帧调度设计正确可行。

Avionics Full Duplex Switched Ethernet（AFDX）,an avionics specified Ethernet communication protocol standard, is the new generation aircraft data network, with the feature of strong real-time, redundant and high reliability and so on. Analyzing priority technology in the chapter of Switch on the ARINC 664 Part 7, a method of priority scheduling design and implementation is brought forward. The advantages and disadvantages of Round-Robin, RR and Static Priority Un-interrupt Scheduling, SPUS are analyzed and compared. On the basis of that, a scheduling algorithm based on priority ranking is proposed. By testing and verifying, it is proved that the design of AFDX priority scheduling is correct and feasible.