CAJ | 학술논문

为实现多媒体数据在 EPA 中的确定性传输，在研究 EPA 通信调度原理的基础上，分析多媒体数据在 EPA 通信宏周期传输的可行性以及分片重组原理，设计多媒体数据在周期时间片的传输调度模型，以及基于链表插入方法的分片数据报重组算法。针对目前多数多媒体设备未集成 EPA 协议栈，无法直接参与 EPA 现场层调度的问题，搭建接入多媒体数据的 EPA 网络测试平台。实验结果表明，在不干扰控制数据传输的情况下，基于 EPA 的多媒体数据传输延时为30 ms~36 ms，满足可接受延时小于130 ms的要求，延时抖动在4 ms 以内，图像清晰流畅，从而验证了将多媒体数据接入 EPA 网络确定性传输的可行性。
위실현다매체수거재 EPA 중적학정성전수，재연구 EPA 통신조도원리적기출상，분석다매체수거재 EPA 통신굉주기전수적가행성이급분편중조원리，설계다매체수거재주기시간편적전수조도모형，이급기우련표삽입방법적분편수거보중조산법。침대목전다수다매체설비미집성 EPA 협의잔，무법직접삼여 EPA 현장층조도적문제，탑건접입다매체수거적 EPA 망락측시평태。실험결과표명，재불간우공제수거전수적정황하，기우 EPA 적다매체수거전수연시위30 ms~36 ms，만족가접수연시소우130 ms적요구，연시두동재4 ms 이내，도상청석류창，종이험증료장다매체수거접입 EPA 망락학정성전수적가행성。
In order to achieve the deterministic transmission of multimedia data in Ethernet for Plant Automation(EPA), this paper analyzes the feasibility of the multimedia data transmit on EPA communication macro cycle and the principle of IP fragment reassembly based on the study of EPA communication scheduling principle. It designs transmission scheduling model of multimedia data in cycle time slice, and a reassemble algorithm of the slice datagram based on linked list insertion method. Aiming at the problem that the most multimedia device can not integrate EPA protocol stack on the market and participate in schedule EPA field layer, it constructs EPA network test platform of accessing multimedia data. Experimental results show that with the case of no disturbance to control data, multimedia data transmission delay based on EPA is 30 ms~36 ms, it can satisfy the acceptable delay-time of 130 ms, delay jitter less than 4 ms, the image is clear and smooth, and the feasibility of multimedia data deterministic transmit on EPA is examined.