本文關(guān)鍵詞： 車載網(wǎng) 動態(tài)性 數(shù)據(jù)傳輸 位置信息 弱狀態(tài)　出處：《計(jì)算機(jī)應(yīng)用》2017年01期 　論文類型：期刊論文

【摘要】：針對車載網(wǎng)(VANET)中車輛高度移動性、拓?fù)渥兓瘎討B(tài)性等特點(diǎn)所導(dǎo)致的數(shù)據(jù)轉(zhuǎn)發(fā)失敗問題,提出一種基于弱狀態(tài)協(xié)議(WSR)下的數(shù)據(jù)包傳輸算法——WSFD,實(shí)現(xiàn)交通控制中心(TCC)到目標(biāo)車輛之間的高效數(shù)據(jù)傳輸。首先,車輛控制中心將收集到的數(shù)據(jù)包發(fā)送給位于目的車輛方向的接入點(diǎn)(AP);然后,接入點(diǎn)在其通信范圍內(nèi)將數(shù)據(jù)包轉(zhuǎn)發(fā)給某車輛,同時(shí)數(shù)據(jù)包攜帶上目標(biāo)車輛位置信息;其次,每次接收到數(shù)據(jù)包的車輛對比自身所持有的映射,篩選出對于目標(biāo)車輛位置信息確定性最大的映射與數(shù)據(jù)包攜帶的位置信息對比以確定下一步轉(zhuǎn)發(fā)方向。若映射置信度較大,則將數(shù)據(jù)包方向修正為向此映射對應(yīng)的地理區(qū)域中心移動,同時(shí)數(shù)據(jù)包更新包中所攜帶的目標(biāo)車輛信息,反之則維持原方向不變。最后經(jīng)過多次轉(zhuǎn)發(fā)修正數(shù)據(jù)包傳輸方向,逐漸逼近目標(biāo)車輛所在的區(qū)域,完成最終的數(shù)據(jù)交付。在30 km×30 km方形區(qū)域的數(shù)據(jù)傳輸實(shí)驗(yàn)中,與TSF與GPSR算法相比,WSFD在數(shù)據(jù)包的傳輸延遲上普遍降低至5 s以下,且將數(shù)據(jù)包投遞率提高至0.92。實(shí)驗(yàn)結(jié)果表明,WSFD能準(zhǔn)確高效地傳輸數(shù)據(jù)包,在增強(qiáng)了駕駛員的人身安全性同時(shí)有效緩解了交通堵塞。
[Abstract]:Aiming at the problem of data forwarding failure caused by the characteristics of vehicle height mobility and topology dynamics in vehicle-borne network (VANET). This paper presents a packet transmission algorithm based on weak state protocol (WSR-WSR-WSFD-WSFDs) to realize efficient data transmission between traffic control center (TCC) and target vehicles. The vehicle control center sends the collected data packet to the access point located in the direction of the destination vehicle. Then, the access point forwards the data packet to a vehicle within its communication range, and the packet carries the location information of the target vehicle. Second, each time the vehicle receives the packet, it compares the maps held by the vehicle itself. The most deterministic mapping for the target vehicle location information is selected to compare the location information carried by the data packet to determine the next forwarding direction. If the mapping confidence is high. The direction of the packet is modified to move to the geographic center corresponding to this map, while the packet updates the target vehicle information carried in the packet. On the contrary, the original direction remains the same. Finally, the transmission direction of the data packet is revised after several retransmission, which gradually approaches the area where the target vehicle is located. In the data transmission experiment of 30km 脳 30km square region, compared with TSF and GPSR algorithm. WSFD generally reduces the transmission delay to less than 5 s and increases the packet delivery rate to 0.92.The experimental results show that WSFD can transmit data packets accurately and efficiently. It enhances the driver's personal safety and effectively alleviates the traffic jam.
【作者單位】： 中國礦業(yè)大學(xué)計(jì)算機(jī)科學(xué)與技術(shù)學(xué)院;舟山市定海區(qū)交通運(yùn)輸局;
【基金】：江蘇省產(chǎn)學(xué)研聯(lián)合創(chuàng)新資金前瞻性聯(lián)合研究項(xiàng)目(BY2014028-09)~~
【分類號】：TN929.5;U495
【正文快照】： 0引言 機(jī)動車的普及在為人們出行帶來方便的同時(shí),也帶來了城市道路交通堵塞的問題。以北京為例,城市主干道平均車速較十年前降低了50%以上,且有高達(dá)60%以上的交叉路口常發(fā)生嚴(yán)重的交通堵塞,嚴(yán)重影響了人們的工作效率和社會發(fā)展[1]。研究表明,這一情況通常與駕駛員無法及時(shí)掌

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