摘要
为了实现音视频向工业实时以太网(EPA)控制总线的业务融合,针对音视频传输特点,结合控制数据的实时性要求,提出一种基于EPA的通信调度算法.通过定义"块数据流",给出数学模型和网络约束条件,并将块数据流视为周期数据,以控制数据延时、块数据流自由周期和块数据流延时抖动为约束,规划宏周期调度;为了充分利用带宽,将同一数据块分割至多个宏周期以规划时间片.算法可保证EPA网络稳定性和控制实时性,且满足块数据流的流畅性需求.实际应用中将视频流与控制数据复合传输,结果表明,在不干扰控制数据传输的同时,延时抖动满足系统要求,算法有效性得到验证.
In order to achieve the service integration of audio/video stream to the EPA control bus,we proposed a communication scheduling application algorithm based on EPA,according to the transmission characteristics of audio/video stream,and with the real-time requirement of control data transmission and block stream＇s constraints.This algorithm defines audio/video stream as ＂block stream＂,meanwhile giving its mathematical model,and considers block stream as period data,takes the control data＇s delay,block＇s period and delay jitter requirements as constraints to schedule the width of micro-cycle;and schedules the time slice to divide the same block to multi micro cycles,in order to fully utilize the bandwidth.This algorithm can ensure the stability of EPA network and control＇s real-time,and can satisfy the fluency of block stream.In a practical complex transmission application of control data and video,the delay jitter of video met the requirement,with no disturbance to control data meanwhile,thus the validity of this algorithm is examined.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2012年第11期2097-2102,2115,共7页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(61074028/F030103)
关键词
EPA
多业务
多媒体
调度算法
延时抖动
Ethernet for plant automation（EPA）
multi-service
multimedia
scheduling algorithm
delay jitter
