QoS analysis on IEEE- 1394b fiber optical bus system
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摘要: 为解决航电系统的网络延迟和阻塞问题,对应用于其上的IEEE-1394b光纤总线系统进行了带宽预留机制和平均响应时间等关键特性的分析.基于IEEE-1394b协议的带宽预留机制,提出了等时数据传输和异步数据传输的服务质量(QoS,Quality of Service)满足的条件(硬QoS).在QoS服务准入控制的等时和异步请求混合的情况下,利用排队论进行了IEEE-1394b异步请求的QoS分析(软QoS),得到了忽略响应间隔时间,IEEE-1394b异步请求队列的平均响应时间.最后通过IEEE-1394b光纤总线实验系统进行了IEEE-1394b的QoS服务评估,验证了理论分析结果.对IEEE-1394b驱动层QoS的设计具有一定的指导意义.Abstract: In order to solve the problem of network delay and information obstacle in avionics system, the key characteristics which are bandwidth reservation mechanism and average response time of IEEE-1394b fiber optical bus system used in avionics system were analyzed. The equation which the QoS (quality of service)of isochronous data transfer and asynchronous data transfer must satisfy was derived (hard QoS) on the ground of bandwidth reservation mechanism in IEEE-1394b protocol. Considering the mixture of isochronous and asynchronous requests in admission control for QoS service, the QoS of asynchronous requests was analyzed based on queuing theory (soft QoS). For the case of ignoring reply interval, the average response time of IEEE-1394b asynchronous requests queues was got. The QoS service of IEEE-1394b was evaluated in IEEE-1394b fiber optical bus experimental system in the end. The theoretic derived results were verified. It has a directive meaning in QoS design of IEEE-1394b driver layer.
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Key words:
- network protocols /
- quality of service /
- avionics
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