MVB非周期信息調(diào)度策略優(yōu)化
發(fā)布時間：2018-12-12 16:26
【摘要】：多功能車輛總線(Multifunction Vehicle Bus,MVB)是列車通信網(wǎng)絡(luò)系統(tǒng)的重要組成部分。為了更好地理解MVB,本文以列車通信網(wǎng)絡(luò)為切入點,闡述了列車通信網(wǎng)絡(luò)的定義、特征、總線和兩層拓?fù)浣Y(jié)構(gòu),并對包括MVB在內(nèi)的幾種常見的列車通信總線進(jìn)行分析和比較,簡述了MVB遵守的實時協(xié)議以及國內(nèi)外對列車通信網(wǎng)絡(luò)的研究現(xiàn)狀。因為列車通信網(wǎng)絡(luò)是一種特殊的現(xiàn)場總線,它的發(fā)展離不開現(xiàn)場總線技術(shù)的進(jìn)步,所以對現(xiàn)場總線中比較重要的調(diào)度理論進(jìn)行了深入的探討,對調(diào)度算法的分類和典型算法以及算法的可行性分析進(jìn)行了總結(jié)性的概括。在此基礎(chǔ)上,本文對MVB的設(shè)備、信息類型、介質(zhì)分配、報文進(jìn)行了詳細(xì)的分析。重點研究了MVB非周期信息的調(diào)度機制,對調(diào)度流程、調(diào)度步驟中的關(guān)鍵幀以及信息碰撞時的仲裁過程進(jìn)行深入的研究。最后介紹了MVB常用的幾種動態(tài)性能指標(biāo)。通過對協(xié)議中標(biāo)準(zhǔn)調(diào)度策略的分析得知,在調(diào)度過程中由并發(fā)信息造成的仲裁延時會對信息的實時性造成較大的影響,同優(yōu)先級信息的調(diào)度順序也僅僅是按照信息被搜索到的順序設(shè)定的,沒有考慮到不同信息的時間特征要求的不同。針對這些問題,現(xiàn)有的方法優(yōu)化效果有限,也不能滿足實際情況的要求�；诖朔N狀況,本文提出了一種新的調(diào)度策略,通過填充幀的使用和信息列表幀的設(shè)計,使得調(diào)度過程可以避免并發(fā)信息的搜索過程。同一從設(shè)備上的后來信息如果時限要求較嚴(yán),本文策略可以大大減小它們的等待延時。這樣對于信息的實時性有了較大的改善。同優(yōu)先級信息按照信息的時限要求進(jìn)行調(diào)度,更加符合實際情況。通過實驗驗證,本文策略與標(biāo)準(zhǔn)策略、SFS調(diào)度策略相比,實驗結(jié)果在四種性能指標(biāo)上全面占優(yōu)。這說明了本文策略在改善信息實時性方面的有效性。通過實驗對比,驗證本文策略在設(shè)備數(shù)量增加的情況下的較大優(yōu)勢。
[Abstract]:Multifunctional vehicle bus (Multifunction Vehicle Bus,MVB) is an important part of train communication network system. In order to better understand MVB, the definition, characteristics, bus and two-layer topology of train communication network are expounded, and several common train communication buses, including MVB, are analyzed and compared. This paper briefly introduces the real-time protocol of MVB and the research status of train communication network at home and abroad. Because the train communication network is a special field bus, its development can not be separated from the progress of the field bus technology, so the more important dispatching theory in the field bus is deeply discussed. The classification of scheduling algorithm, the typical algorithm and the feasibility analysis of the algorithm are summarized. On this basis, this paper analyzes the equipment, information type, medium distribution and message of MVB in detail. The scheduling mechanism of MVB aperiodic information is studied emphatically, and the scheduling process, the key frames in the scheduling step and the arbitration process in the event of information collision are deeply studied. At last, several dynamic performance indexes of MVB are introduced. Through the analysis of the standard scheduling policy in the protocol, we know that the arbitration delay caused by concurrent information in the scheduling process will have a great impact on the real-time of the information. The scheduling order of the same priority information is only set according to the order in which the information is searched, and the time characteristic requirements of different information are not taken into account. For these problems, the existing optimization methods have limited effect and can not meet the requirements of the actual situation. Based on this situation, a new scheduling strategy is proposed in this paper, which can avoid the concurrent information searching process by using the fill frame and the design of the information list frame. If the time limit of the later information on the same slave device is strict, the waiting delay can be greatly reduced. In this way, the real-time information has been greatly improved. The same priority information is scheduled according to the time limit of the information, which is more in line with the actual situation. The experimental results show that compared with the standard policy and the SFS scheduling strategy, the experimental results are superior to each other in four kinds of performance indexes. This shows the effectiveness of this strategy in improving the real-time information. Through the comparison of experiments, it is proved that this strategy has a great advantage in the case of increasing the number of equipment.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U270.382
[Abstract]:Multifunctional vehicle bus (Multifunction Vehicle Bus,MVB) is an important part of train communication network system. In order to better understand MVB, the definition, characteristics, bus and two-layer topology of train communication network are expounded, and several common train communication buses, including MVB, are analyzed and compared. This paper briefly introduces the real-time protocol of MVB and the research status of train communication network at home and abroad. Because the train communication network is a special field bus, its development can not be separated from the progress of the field bus technology, so the more important dispatching theory in the field bus is deeply discussed. The classification of scheduling algorithm, the typical algorithm and the feasibility analysis of the algorithm are summarized. On this basis, this paper analyzes the equipment, information type, medium distribution and message of MVB in detail. The scheduling mechanism of MVB aperiodic information is studied emphatically, and the scheduling process, the key frames in the scheduling step and the arbitration process in the event of information collision are deeply studied. At last, several dynamic performance indexes of MVB are introduced. Through the analysis of the standard scheduling policy in the protocol, we know that the arbitration delay caused by concurrent information in the scheduling process will have a great impact on the real-time of the information. The scheduling order of the same priority information is only set according to the order in which the information is searched, and the time characteristic requirements of different information are not taken into account. For these problems, the existing optimization methods have limited effect and can not meet the requirements of the actual situation. Based on this situation, a new scheduling strategy is proposed in this paper, which can avoid the concurrent information searching process by using the fill frame and the design of the information list frame. If the time limit of the later information on the same slave device is strict, the waiting delay can be greatly reduced. In this way, the real-time information has been greatly improved. The same priority information is scheduled according to the time limit of the information, which is more in line with the actual situation. The experimental results show that compared with the standard policy and the SFS scheduling strategy, the experimental results are superior to each other in four kinds of performance indexes. This shows the effectiveness of this strategy in improving the real-time information. Through the comparison of experiments, it is proved that this strategy has a great advantage in the case of increasing the number of equipment.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U270.382
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