本文關(guān)鍵詞： 命名數(shù)據(jù)網(wǎng)絡(luò) 車(chē)載網(wǎng)絡(luò) 傳輸機(jī)制 中繼節(jié)點(diǎn) PIT管理　出處：《重慶郵電大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著現(xiàn)代交通和汽車(chē)工業(yè)的飛速發(fā)展,我國(guó)的汽車(chē)保有量高速增長(zhǎng),尤其是隨著人民消費(fèi)水平的提高,私家車(chē)普及率逐年遞增。車(chē)載網(wǎng)絡(luò)作為一種可以提高道路安全性和交通效率,同時(shí)滿(mǎn)足駕乘人員行車(chē)應(yīng)用需求的車(chē)輛互聯(lián)網(wǎng)絡(luò),得到了政府部門(mén)與汽車(chē)廠商的高度重視。車(chē)載網(wǎng)絡(luò)的特點(diǎn)是節(jié)點(diǎn)移動(dòng)速度快,網(wǎng)絡(luò)拓?fù)渥兓l繁,節(jié)點(diǎn)間的連通時(shí)間較短,然而傳統(tǒng)基于IP網(wǎng)絡(luò)體系的點(diǎn)對(duì)點(diǎn)通信方式難以適應(yīng)車(chē)載網(wǎng)絡(luò)的動(dòng)態(tài)環(huán)境。命名數(shù)據(jù)網(wǎng)絡(luò)(Named Data Networking,NDN)作為一種近年來(lái)被提出的未來(lái)網(wǎng)絡(luò)架構(gòu),可以從根本上改變車(chē)載網(wǎng)絡(luò)的設(shè)計(jì)方式。作為信息中心網(wǎng)的一個(gè)分支,命名數(shù)據(jù)網(wǎng)絡(luò)直接應(yīng)用數(shù)據(jù)名稱(chēng)來(lái)實(shí)現(xiàn)數(shù)據(jù)的分發(fā)。不同于當(dāng)前IP網(wǎng)絡(luò)架構(gòu)中將數(shù)據(jù)發(fā)送給某個(gè)特定的車(chē)輛,命名數(shù)據(jù)網(wǎng)絡(luò)則是直接去獲取特定的數(shù)據(jù),命名數(shù)據(jù)網(wǎng)絡(luò)的數(shù)據(jù)傳輸模式可以更好的適應(yīng)車(chē)載網(wǎng)絡(luò)的設(shè)計(jì)需求。本論文對(duì)命名數(shù)據(jù)網(wǎng)絡(luò)架構(gòu)下的車(chē)載網(wǎng)絡(luò)進(jìn)行了研究分析,并對(duì)該架構(gòu)下的數(shù)據(jù)傳輸機(jī)制進(jìn)行了深入研究。首先,針對(duì)當(dāng)前車(chē)載命名數(shù)據(jù)網(wǎng)絡(luò)普遍以車(chē)輛間距作為單一轉(zhuǎn)發(fā)節(jié)點(diǎn)選擇條件,導(dǎo)致多數(shù)據(jù)塊數(shù)據(jù)回傳成功率低的問(wèn)題,提出一種基于數(shù)據(jù)屬性的Interest包轉(zhuǎn)發(fā)機(jī)制。該策略綜合考慮車(chē)輛當(dāng)前行駛狀況,引入多個(gè)轉(zhuǎn)發(fā)選擇條件,并對(duì)車(chē)載數(shù)據(jù)屬性進(jìn)行劃分,采用三標(biāo)度層次分析法調(diào)整選擇條件權(quán)重,完成對(duì)轉(zhuǎn)發(fā)節(jié)點(diǎn)的動(dòng)態(tài)選擇。仿真分析表明,該策略在保證Interest包傳輸速度的基礎(chǔ)上,提高了Data包回傳的成功率,降低了數(shù)據(jù)獲取時(shí)延。然后,針對(duì)車(chē)載網(wǎng)絡(luò)動(dòng)態(tài)環(huán)境中,攜帶對(duì)應(yīng)PIT(Pending Interest Table)條目的車(chē)輛駛離前回傳節(jié)點(diǎn)信號(hào)范圍導(dǎo)致Data包回傳失敗的情況,提出一種動(dòng)態(tài)PIT條目管理機(jī)制。車(chē)輛處于等待轉(zhuǎn)發(fā)階段時(shí),即使監(jiān)聽(tīng)到待轉(zhuǎn)發(fā)Interest包被其他車(chē)輛轉(zhuǎn)發(fā),車(chē)輛會(huì)根據(jù)該機(jī)制動(dòng)態(tài)選擇是否仍將其添加進(jìn)PIT列表,并且動(dòng)態(tài)調(diào)整PIT條目生存時(shí)間,及時(shí)清理PIT列表,保證條目數(shù)量在合理范圍內(nèi)。此方法在保證PIT條目處于可控范圍內(nèi)的前提下,有效提高Data包回傳成功率,增加數(shù)據(jù)傳輸?shù)聂敯粜浴?br/>[Abstract]:With the rapid development of modern traffic and automobile industry, the number of cars in our country has increased rapidly, especially with the improvement of people's consumption level. The popularization rate of private cars is increasing year by year. As a kind of vehicular network which can improve road safety and traffic efficiency and meet the needs of drivers' driving applications, The characteristics of onboard network are fast moving of nodes, frequent changes in network topology, and short communication time between nodes. However, the traditional point-to-point communication mode based on IP network system is difficult to adapt to the dynamic environment of vehicular network. Named Data networking is a kind of future network architecture proposed in recent years. Can fundamentally change the design of vehicular networks. As a branch of the information center network, The named data network directly applies the data name to realize the data distribution. Different from the current IP network architecture sending data to a specific vehicle, the naming data network is to obtain the specific data directly. The data transmission mode of the named data network can better meet the design requirements of the vehicle network. In this paper, the vehicle network under the architecture of the named data network is studied and analyzed. And the data transmission mechanism under this framework is studied. Firstly, the vehicle spacing is generally used as the single forwarding node selection condition in the current vehicle named data network, which leads to the low success rate of multi-block data return transmission. This paper presents a Interest packet forwarding mechanism based on data attributes. The strategy considers the current vehicle driving condition, introduces several forwarding selection conditions, divides the vehicle data attributes, and adjusts the weight of the selection conditions by using the three-scale AHP method. The dynamic selection of forwarding nodes is completed. Simulation results show that the strategy improves the success rate of Data packet return transmission and reduces the data acquisition delay on the basis of guaranteeing the transmission speed of Data packets. In this paper, a dynamic PIT entry management mechanism is proposed for the failure of Data packet return due to the signal range of the Data return node which carries the corresponding PIT(Pending Interest Table.When the vehicle is waiting for forwarding, Even if it is monitored that the Interest packet is forwarded by other vehicles, the vehicle dynamically selects whether to add it to the PIT list according to the mechanism, and dynamically adjusts the survival time of the PIT entry to clean up the PIT list in time. This method can effectively improve the success rate of Data packet return transmission and increase the robustness of data transmission.
【學(xué)位授予單位】：重慶郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN929.5;U495

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