摘要
IEEE-1394b是一种高速数据总线,已成功应用于航空电子中.其等时传输保证数据传输具有确定的延时,广泛应用于多媒体数据的传输.为解决等时传输中的性能评价问题,基于确定与随机Petri网(DSPN,Determ inistic and Stochastic Petri Net),建立了IEEE-1394b总线等时传输的模型.模型考虑了对等时传输性能影响较大的带宽预留和仲裁机制的影响,精确描述了总线行为.通过对模型的仿真分析,得到了等时传输的吞吐量和平均等待时间等性能指标与节点数量、数据包大小以及数据包到达速率的关系,并得到了IEEE-1394b等时传输总线吞吐量的极限.
IEEE-1394b is a high speed data bus,which has been successfully utilized in avionics.Its isochronous transmission assures definite transmission delay of data,and is widely adopted in multimedia data transmission.To solve the performance evaluation problem of isochronous transmission,deterministic and stochastic Petri net（DSPN） model of IEEE-1394b isochronous transmission was developed.The proposed model considers the effect of bandwidth reservation and arbitration mechanism,which have remarkable effect on isochronous transmission performance,and the bus activity was described precisely.Through simulation,the relations among system＇s throughput,average waiting time,packet size,packet arrival rate and node count were numerical studied.The limitation of IEEE-1394b isochronous transmission throughput was also obtained.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1281-1285,共5页
Journal of Beijing University of Aeronautics and Astronautics
