本文選題：服務(wù)信道接入 + 信道協(xié)作�。� 參考：《河南工業(yè)大學(xué)》2014年碩士論文

【摘要】：車(chē)載自組織網(wǎng)絡(luò)是無(wú)線Ad hoc網(wǎng)絡(luò)在車(chē)載環(huán)境下的重要應(yīng)用。車(chē)載網(wǎng)絡(luò)主要運(yùn)用多信道操作模式來(lái)提供開(kāi)放的安全服務(wù)和安全有效的駕駛體驗(yàn)，由此可見(jiàn)多信道接入在車(chē)載網(wǎng)絡(luò)中占據(jù)非常重要的角色。吞吐量和時(shí)延是兩個(gè)重要的指標(biāo)。無(wú)線信道媒體接入控制（MediumAccess Control，MAC）機(jī)制是車(chē)載自組織網(wǎng)絡(luò)的關(guān)鍵技術(shù)之一，也是車(chē)載自組織網(wǎng)絡(luò)支持服務(wù)質(zhì)量（Quality of Service，QoS）的關(guān)鍵。專(zhuān)用短程通信（DedicatedShort Range Communications，DSRC）使用的接入?yún)f(xié)議IEEE802.11p通過(guò)增強(qiáng)型分布式接入控制（Enhanced Distribution Coordinate Access，EDCA）及優(yōu)先級(jí)劃分來(lái)提供QoS保證。 本文首先分析了車(chē)載自組織網(wǎng)絡(luò)的現(xiàn)狀及發(fā)展概況，介紹車(chē)載網(wǎng)絡(luò)中的MAC協(xié)議標(biāo)準(zhǔn)，信道接入機(jī)制作為其關(guān)鍵技術(shù)之一，起著不可替代的作用。針對(duì)IEEE802.11p和1609.4中存在的問(wèn)題，，分析了其接入原理，并對(duì)其性能做了簡(jiǎn)單的仿真分析。在IEEE802.11p MAC的基礎(chǔ)上，根據(jù)車(chē)載自組網(wǎng)的特點(diǎn)和車(chē)輛相向行駛的特點(diǎn)，針對(duì)服務(wù)信道接入存在的缺陷，提出了一種基于信道通信間負(fù)載均衡和車(chē)輛間信道協(xié)作的自適應(yīng)多信道接入機(jī)制MCAS，首先給出了系統(tǒng)模型，做了馬爾可夫模型分析，從理論上分析MCAS的各項(xiàng)性能，并通過(guò)MATLAB仿真進(jìn)行吞吐量、分組時(shí)延、丟包率等性能分析。結(jié)果表明，新算法的時(shí)延、丟包率和吞吐量都優(yōu)于WAVE和VeMAC。該機(jī)制能夠很好地利用控制信道與服務(wù)信道和服務(wù)信道之間的協(xié)作關(guān)系，更有效地利用信道，能夠使之更好地適應(yīng)車(chē)載網(wǎng)絡(luò)環(huán)境。 進(jìn)而，又嘗試使用混合的方法，即將CSMA和本文中的MCAS兩種機(jī)制結(jié)合，來(lái)更好的運(yùn)用于VANET中。將幀長(zhǎng)劃分為傳輸期和預(yù)留期兩個(gè)階段，傳輸期使用TDMA機(jī)制，預(yù)留期使用CSMA機(jī)制競(jìng)爭(zhēng)信道。仿真結(jié)果表明，MCAS機(jī)制能在較大程度上改善網(wǎng)絡(luò)性能，能夠解決目前車(chē)載網(wǎng)中MAC協(xié)議所存在信道競(jìng)爭(zhēng)和分配、傳輸時(shí)延、信道利用率、吞吐量等問(wèn)題，使其可以很好的滿(mǎn)足實(shí)際網(wǎng)絡(luò)的應(yīng)用。 本文提出的方案在車(chē)載網(wǎng)絡(luò)中有很重要的作用，對(duì)MAC協(xié)議的研究也有很大的幫助。
[Abstract]:Ad hoc network is an important application of wireless Ad hoc network in vehicle environment. Vehicle network mainly uses multi-channel operation mode to provide open security service and safe and effective driving experience, so multi-channel access plays a very important role in vehicle network. Throughput and delay are two important indicators. Wireless channel media access control (MAC) mechanism is one of the key technologies in vehicular ad hoc networks, and is also the key to support quality of Service (QoS) in vehicular ad hoc networks. IEEE 802.11p, an access protocol used by dedicated short-range short range Communications (DSRC), provides QoS assurance through enhanced Distribution coordinated access EDCAs and priority partitioning. This paper first analyzes the current situation and development of vehicle-borne ad hoc networks, introduces the MAC protocol standards in vehicular networks, and the channel access mechanism, as one of its key technologies, plays an irreplaceable role. Aiming at the problems existing in IEEE 802.11p and 1609.4, this paper analyzes the access principle of IEEE 802.11p, and makes a simple simulation analysis of its performance. On the basis of IEEE 802.11p MAC, according to the characteristics of vehicle-mounted ad hoc network and the characteristics of vehicle driving in opposite direction, aiming at the defects of service channel access, An adaptive multi-channel access mechanism (MCAS) based on inter-channel load balancing and inter-vehicle channel cooperation is proposed. Firstly, the system model is presented, and the Markov model is analyzed, and the performance of MCAS is analyzed theoretically. The throughput, packet delay and packet loss rate are analyzed by MATLAB simulation. The results show that the delay, packet loss rate and throughput of the new algorithm are better than those of wave and VeMAC. The mechanism can make good use of the cooperative relationship between the control channel, the service channel and the service channel, and make the channel more effective, so that it can adapt to the vehicle network environment better. Furthermore, we try to combine CSMA with MCAS in this paper to better use in VANET. The frame length is divided into two stages: transmission period and reservation period. TDMA mechanism is used in transmission period and CSMA mechanism is used to compete channel in reservation period. The simulation results show that the MCAS mechanism can improve the network performance to a large extent, and can solve the problems of channel competition and allocation, transmission delay, channel utilization, throughput and so on. So that it can be very good to meet the application of the actual network. The scheme proposed in this paper plays an important role in vehicle network, and it is also helpful to the study of MAC protocol.
【學(xué)位授予單位】：河南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U495;U463.67;TN929.5

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相關(guān)期刊論文 前2條

1 馬柯;俞能海;楊福榮;;EASA:一種分簇Ad Hoc網(wǎng)絡(luò)高效自適應(yīng)TDMA時(shí)隙分配算法[J];電子學(xué)報(bào);2010年07期

2 YANG Wei-dong;LI Pan;LIU yan;ZHU Hong-song;;Adaptive TDMA slot assignment protocol for vehicular ad-hoc networks[J];The Journal of China Universities of Posts and Telecommunications;2013年01期

本文編號(hào)：2036521