基于虚拟链路的航电网络信用量评估模型  

Evaluation of credit consume of avionics network based on virtual link

作　　者：谷晓燕[1] 代真[2] 何锋[2] 

机构地区：[1]北京信息科技大学信息管理学院,北京100192 [2]北京航空航天大学电子信息工程学院,北京100191

出　　处：《计算机工程与设计》2015年第4期892-895,905,共5页Computer Engineering and Design

基　　金：国家自然科学基金项目(61301086);北京市教委科研基金项目(KM201411232016);国家科技支撑计划基金项目(2012BAH08B02)

摘　　要：航空电子全双工交换式以太网(AFDX)采用信用量令牌桶进行流量管制,为确保信用量设置的合理性,需要考虑虚拟链路(VL)的时延抖动情况。利用网络演算计算VL流量延迟边界,利用"Group"方法获得VL在整个网络中的分布式时延抖动大小,以此为基础分析时延抖动值对信用量设置的影响,利用等效带宽比概念提出交换节点流量带宽约束条件,构建4种不同通信完整性级别的约束准则,为交换节点信用量的合理设置提供设置参考。Avionics full duplex switched Ethernet（AFDX）adopts credited token bucket consume model for real-time communication traffic policing.To ensure the rationality of the setting of credit amounts,the jitters of virtual links（VL）need to be considered.Network calculus model was used to calculate VL flow end-to-end delays,and the＂Group＂method was used to obtain the distributed delays of VL in the whole network.Based on the distributed delays,the influence of jitter value on credit amount setting was analyzed.By using the equivalent bandwidth concept,the flow bandwidth constraints for switching nodes were proposed,and four constraint conditions models for different communication integrity levels were established,which provided a reasonable reference for the setting of credit values.

关 键 词：航空电子全双工交换式以太网 信用量令牌桶 时延抖动 通信完整性 虚拟链路 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]