本文選題：車載網(wǎng) + IEEE��； 參考：《電訊技術(shù)》2017年04期

【摘要】：車載網(wǎng)(VANETs)需提供時(shí)延敏感的安全應(yīng)用和非安全應(yīng)用的通信服務(wù)。這就使得媒體接入控制(MAC)協(xié)議既要滿足安全消息的時(shí)延和可靠率,又要保證非安全消息的服務(wù)信道利用率,給MAC的設(shè)計(jì)提出了挑戰(zhàn)。為此,提出基于時(shí)分多址的MAC改進(jìn)算法(I-TDMA-MAC)。I-TDMA-MAC算法在每個(gè)同步幀內(nèi)給每輛車分配兩個(gè)子時(shí)隙,旨在提高無碰撞信道接入率和安全消息的傳遞率。同時(shí),對(duì)空閑時(shí)隙采取重分配策略,并基于最短作業(yè)優(yōu)先準(zhǔn)則(SJF)給空閑時(shí)隙設(shè)置優(yōu)先級(jí),旨在提高服務(wù)信道利用率。仿真結(jié)果表明,提出的I-TDMA-MAC算法的安全消息傳遞率高達(dá)99%,當(dāng)車流密度到達(dá)100 vehicle/km時(shí),服務(wù)信道利用率接近于90%。
[Abstract]:Vehicular network (VANETs) is required to provide delay-sensitive security applications and non-secure applications of communication services.This makes the MAC protocol not only satisfy the delay and reliability of secure messages, but also guarantee the utilization of service channels of non-secure messages, which challenges the design of MAC.Therefore, an improved MAC algorithm based on time-division multiple access (TDMA) is proposed to allocate two sub-slots to each vehicle in each synchronous frame. The proposed algorithm aims to improve the access rate of collision free channel and the transmission rate of security messages.At the same time, the idle time slot is rescheduled, and the idle time slot is given priority based on the shortest job first criterion (SJF), in order to improve the utilization of service channel.Simulation results show that the proposed I-TDMA-MAC algorithm has a high security message delivery rate of 99%. When the traffic density reaches 100 vehicle/km, the service channel utilization rate is close to 90%.
【作者單位】： 河南廣播電視大學(xué)信息工程學(xué)院;河南師范大學(xué)計(jì)算機(jī)與信息工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(1404602) 河南省高等學(xué)校重點(diǎn)科研項(xiàng)目(15B520006) 河南省科技廳2017年科技攻關(guān)項(xiàng)目(172102210564) 國家開放大學(xué)2014年研究課題(G14A2402Y) 河南省教育廳2015年重點(diǎn)研究項(xiàng)目(15A520060)
【分類號(hào)】：TN929.5;U495
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本文編號(hào)：1756033