發(fā)布時間：2018-05-10 05:51

  本文選題：智能交通系統(tǒng) + 車輛自組織網(wǎng)絡(luò)　； 參考：《福建師范大學(xué)》2015年碩士論文

【摘要】：隨著現(xiàn)代科技和經(jīng)濟(jì)的迅猛發(fā)展,日益增加的車輛給城市道路安全造成了巨大壓力。由于道路安全的迫切需要,車載自組織網(wǎng)絡(luò)(VANET)應(yīng)運而生,目前VANET是智能交通系統(tǒng)(ITS)最具發(fā)展前景的重要研究領(lǐng)域之一。最近,德國電信聯(lián)手中國移動投資車聯(lián)網(wǎng),車載自組織網(wǎng)的研究越來越受歡迎。VANET中的計算機仿真建模以及緊急消息傳播領(lǐng)域,一直是研究的重要對象。因此,提高VANET車輛計算機仿真的真實性以及提出一個完善的緊急消息傳播協(xié)議對VANET的發(fā)展研究以及指導(dǎo)實踐有重要意義。趨于真實的車輛模型,才能真實驗證協(xié)議的有效性和實用性。本文對VANET最流行的道路交通仿真軟件SUMO進(jìn)行改進(jìn)開發(fā),提出了考慮前后車輛運動狀態(tài)以及車輛加減速度漸變過程的新跟馳模型,解決以往模型中加減速度突變,安全車速偏大等問題,同時兼顧交通效率和行車安全的模型,為后期協(xié)議仿真提供基礎(chǔ)。同時,本文還提出適用多車道情況并自適應(yīng)車輛密度,充分考慮車載自組織網(wǎng)絡(luò)的特點,同時使用同向、反向節(jié)點傳播消息的緊急消息傳播協(xié)議,該協(xié)議優(yōu)先選擇合適的同向傳播節(jié)點,快速傳輸緊急消息,減少轉(zhuǎn)播跳數(shù),降低時延和丟包率；當(dāng)不存在同向節(jié)點時,對反向節(jié)點進(jìn)行選舉,選舉出最優(yōu)的轉(zhuǎn)播節(jié)點,利用其傳播,使緊急消息能夠有效傳播到目標(biāo)區(qū)域。仿真表明,該協(xié)議表現(xiàn)了極高的自適應(yīng)性,并降低了廣播風(fēng)暴發(fā)生幾率和時延,反向傳播時,消息轉(zhuǎn)播的時延也能夠達(dá)到緊急消息的傳播要求。
[Abstract]:With the rapid development of modern science and technology and economy, the increasing number of vehicles has brought great pressure to urban road safety. Due to the urgent need of road safety, the vehicle-borne ad hoc network (VANET) emerges as the times require. At present, VANET is one of the most promising research fields of Intelligent Transportation system (its). Recently, Deutsche Telekom has joined with China Mobile Investment vehicle to connect with each other. The research on vehicle-borne ad hoc networks is becoming more and more popular in the field of computer simulation modeling and emergency message transmission in .VANET, which is always an important research object. Therefore, it is of great significance to improve the authenticity of VANET vehicle computer simulation and to propose a perfect emergency message communication protocol for the development of VANET. Only the real vehicle model can verify the validity and practicability of the protocol. In this paper, the road traffic simulation software SUMO, which is the most popular simulation software of VANET, is improved and developed, and a new car-following model considering the moving state of the vehicle before and after and the gradual change process of the vehicle speed increase and deceleration is proposed to solve the sudden change of the increment and deceleration speed in the previous models. The safety speed is too large and the model of traffic efficiency and traffic safety is taken into account so as to provide the foundation for the later protocol simulation. At the same time, this paper also proposes an emergency message communication protocol, which is suitable for multi-lane cases and adapts to vehicle density, fully considers the characteristics of vehicle-borne ad hoc networks, and uses codirectional and reverse nodes to spread messages. The protocol preferentially selects suitable codirectional propagation nodes, transmits emergency messages quickly, reduces the number of hops, reduces the delay and packet loss rate, elects the reverse node when there is no codirectional node, and elects the optimal relay node. With its dissemination, emergency messages can be effectively spread to the target area. Simulation results show that the protocol has high adaptability and reduces the probability and delay of broadcast storm. In the case of backpropagation, the delay of message transmission can also meet the requirements of emergency message transmission.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN915.04

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本文編號：1868042