本文關(guān)鍵詞：基于Wi-Fi Direct的車路協(xié)同數(shù)據(jù)分發(fā)技術(shù)　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

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【摘要】：隨著車聯(lián)網(wǎng)技術(shù)的快速發(fā)展,基于車路系統(tǒng)的交通信息交互成為其中的關(guān)鍵問題。車路協(xié)同交通數(shù)據(jù)具有實時性強、突發(fā)性高等特點,因而研究車路協(xié)同數(shù)據(jù)實時交互方法顯得尤為重要,特別是基于路側(cè)設(shè)備的數(shù)據(jù)分發(fā)效率和機制直接影響到整個車路協(xié)同系統(tǒng)數(shù)據(jù)共享的實時性和可靠性。Wi-Fi Direct作為一種新興的短程通信技術(shù),正在得到廣泛關(guān)注和推廣。本文主要研究采用Wi-Fi Direct作為通信手段的車路協(xié)同交互系統(tǒng)中的數(shù)據(jù)分發(fā)問題,通過改進(jìn)接入方法和分發(fā)算法,以滿足車路協(xié)同的高效傳輸要求。首先,本文在深入分析車路協(xié)同系統(tǒng)應(yīng)用特點、Wi-Fi Direct標(biāo)準(zhǔn)和接入機制、現(xiàn)有Wi-Fi Direct在車路協(xié)同接入性能上不足的基礎(chǔ)上,提出了一種基于過濾信息的Wi-Fi Direct快速接入方法,該方法通過在接入申請信息中附加過濾數(shù)據(jù)幀實現(xiàn)對接入請求的快速響應(yīng),有效的提高了車載設(shè)備接入路側(cè)基站的速度。其次,本文研究了車路協(xié)同系統(tǒng)的數(shù)據(jù)傳輸機制和數(shù)據(jù)特點,闡述了現(xiàn)有數(shù)據(jù)分發(fā)算法FCFS算法、RM算法、EDF算法的原理和優(yōu)缺點以及其在車路系統(tǒng)數(shù)據(jù)分發(fā)中的可行性。針對實時性強的EDF動態(tài)優(yōu)先級算法提出了改進(jìn)的可變周期EDF算法APEDF算法,并且結(jié)合車路協(xié)同數(shù)據(jù)分發(fā)需求提出了車路環(huán)境下的CR-APEDF數(shù)據(jù)分發(fā)算法。最后,本文設(shè)計并實現(xiàn)了一種Android平臺上的車路協(xié)同數(shù)據(jù)分發(fā)軟件,包含Wi-Fi Direct接入模塊、socket通信�？臁�(shù)據(jù)傳輸模塊、算法實現(xiàn)模塊。在真實車路協(xié)同場景下,利用該軟件測試了快速接入方法性能和CR-APEDF數(shù)據(jù)分發(fā)算法性能。測試結(jié)果表明,基于過濾信息的Wi-Fi Direct快速接入方法在接入速度上平均提高了30%以上;CR-APEDF算法在任務(wù)錯失率、平均延遲、處理機利用率各項指標(biāo)上優(yōu)于其他算法;包含CR-APEDF算法的車路數(shù)據(jù)分發(fā)系統(tǒng)在靜態(tài)和動態(tài)環(huán)境下都具有較大的數(shù)據(jù)分發(fā)吞吐量,滿足車路協(xié)同實時性要求。
[Abstract]:With the rapid development of vehicle networking technology, the traffic information interaction based on vehicle-road system becomes a key problem. The vehicle-road cooperative traffic data has the characteristics of real-time and sudden. Therefore, it is very important to study the real-time interaction method of vehicle-road collaborative data. In particular, the efficiency and mechanism of data distribution based on roadside devices directly affect the real-time and reliability of data sharing in the whole vehicle-road collaborative system. Wi-Fi. Direct is a new short-range communication technology. This paper mainly studies the data distribution problem in the vehicle-road collaborative interaction system which uses Wi-Fi Direct as the communication means, and improves the access method and distribution algorithm. In order to meet the efficient transmission requirements of vehicle-road coordination. Firstly, this paper deeply analyzes the application characteristics of vehicle-road coordination system, Wi-Fi Direct standard and access mechanism. Based on the deficiency of the performance of the existing Wi-Fi Direct, a fast Wi-Fi Direct access method based on filtering information is proposed. The method realizes the fast response to the access request by adding the filtered data frame to the access request information, and effectively improves the speed of the vehicle equipment accessing the base station on the road side. Secondly. In this paper, the data transmission mechanism and data characteristics of the vehicle-road cooperative system are studied, and the existing data distribution algorithm (FCFS) and the RM algorithm are described. The principle, advantages and disadvantages of EDF algorithm and its feasibility in data distribution of vehicular system are discussed. An improved APEDF algorithm of variable period EDF algorithm is proposed for the real-time dynamic priority algorithm of EDF. In addition, the CR-APEDF data distribution algorithm in the vehicle-road environment is proposed according to the requirements of vehicle-road collaborative data distribution. Finally. This paper designs and implements a kind of vehicle-road cooperative data distribution software based on Android platform, which includes Wi-Fi Direct access module, socket communication module and data transmission module. The performance of fast access method and CR-APEDF data distribution algorithm are tested by using this software in the real vehicle-road collaborative scene. The test results show that. The Wi-Fi Direct fast access method based on filtering information improves the access speed by more than 30% on average. The CR-APEDF algorithm is superior to other algorithms in task miss rate, average delay and processor utilization ratio. The vehicle-road data distribution system including CR-APEDF algorithm has large data distribution throughput in both static and dynamic environment, which meets the real-time requirements of vehicle-road coordination.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U495

【相似文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 陳皓;基于Wi-Fi Direct的車路協(xié)同數(shù)據(jù)分發(fā)技術(shù)[D];長安大學(xué);2015年

2 史寧寧;基于Wi-Fi Direct的移動共享和通訊平臺的設(shè)計與實現(xiàn)[D];長安大學(xué);2014年

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本文編號：1429261