發(fā)布時(shí)間：2018-10-19 11:44

【摘要】：移動(dòng)自組織網(wǎng)絡(luò)具有無(wú)中心和自組織的特點(diǎn),無(wú)需固定的網(wǎng)絡(luò)基礎(chǔ)設(shè)施支持,能夠快速地為軍事和民事應(yīng)用搭建網(wǎng)絡(luò)平臺(tái),是未來(lái)無(wú)線通信網(wǎng)絡(luò)的關(guān)鍵技術(shù)。由于移動(dòng)自組織網(wǎng)絡(luò)中節(jié)點(diǎn)的地位是對(duì)等的,基于固定網(wǎng)絡(luò)或蜂窩網(wǎng)絡(luò)的媒體接入控制(Media Access Control,MAC)協(xié)議不能滿(mǎn)足移動(dòng)自組織網(wǎng)絡(luò)需求,因而需要專(zhuān)門(mén)設(shè)計(jì)適用于自組織網(wǎng)絡(luò)的信道接入?yún)f(xié)議。“無(wú)沖突”的多址協(xié)議是目前移動(dòng)自組織網(wǎng)絡(luò)多址接入?yún)f(xié)議的發(fā)展方向。本文結(jié)合移動(dòng)自組織網(wǎng)絡(luò)的設(shè)計(jì)要求,提出了一種基于時(shí)分多址接入技術(shù)的信道預(yù)約協(xié)議(Channel Reservation-Time Division Multiple Access,CR-TDMA)。首先詳細(xì)地描述了協(xié)議的幀格式,分組格式,時(shí)隙的劃分原則;其次,本協(xié)議在網(wǎng)絡(luò)場(chǎng)景密集和稀疏時(shí)采用不同的同步廣播信道分配機(jī)制,完成節(jié)點(diǎn)的建網(wǎng)或入網(wǎng)過(guò)程,不僅提高了無(wú)線信道利用率,而且可以縮短分組平均接入時(shí)延;最后,根據(jù)移動(dòng)自組織網(wǎng)絡(luò)的網(wǎng)絡(luò)規(guī)模、節(jié)點(diǎn)移動(dòng)速度、業(yè)務(wù)模型等提出同步信道預(yù)約機(jī)制,完成節(jié)點(diǎn)預(yù)約以及釋放同步廣播信道的過(guò)程,進(jìn)一步提高網(wǎng)絡(luò)性能指標(biāo)。本文采用OPNET仿真軟件建立移動(dòng)移動(dòng)自組織網(wǎng)絡(luò)模型,在該模型下設(shè)置不同的節(jié)點(diǎn)移動(dòng)速率、網(wǎng)絡(luò)負(fù)載、網(wǎng)絡(luò)規(guī)模等參數(shù)進(jìn)行網(wǎng)絡(luò)仿真。仿真結(jié)果表明,本文設(shè)計(jì)的基于時(shí)分多址接入(Time Division Multiple Access,TDMA)的同步信道預(yù)約接入?yún)f(xié)議可以適應(yīng)快速動(dòng)態(tài)變化的網(wǎng)絡(luò)拓?fù)?有效支持突發(fā)業(yè)務(wù)對(duì)接入時(shí)延的要求,提高網(wǎng)絡(luò)吞吐量。
[Abstract]:Mobile ad hoc networks have the characteristics of no center and self organization, and can build the network platform for military and civilian applications quickly without the support of fixed network infrastructure. It is the key technology of wireless communication network in the future. Due to the peer status of nodes in mobile ad hoc networks, media access control (Media Access Control,MAC) protocols based on fixed networks or cellular networks can not meet the needs of mobile ad hoc networks. Therefore, it is necessary to design a channel access protocol for ad hoc networks. Conflict free multiple access protocol is the development direction of mobile ad hoc network multiple access protocol. In this paper, a channel reservation protocol (Channel Reservation-Time Division Multiple Access,CR-TDMA) based on time division multiple access (TDMA) is proposed to meet the design requirements of mobile ad hoc networks. Firstly, the frame format, packet format and slot partition principle of the protocol are described in detail. Secondly, different synchronous broadcast channel allocation mechanisms are used in the dense and sparse network scenarios to complete the process of network construction or access. It not only improves the utilization of wireless channel, but also shortens the average packet access delay. Finally, a synchronous channel reservation mechanism is proposed according to the network size, node mobility speed and traffic model of the mobile ad hoc network. The process of node reservation and release of synchronous broadcast channel is completed, and the network performance index is further improved. In this paper, a mobile ad hoc network model is established by using OPNET simulation software. Under this model, different node mobility rates, network load, network scale and other parameters are set up to simulate the network. The simulation results show that the proposed synchronous channel reservation protocol based on TDMA (Time Division Multiple Access,TDMA) can adapt to the fast dynamic network topology, effectively support the requirements of burst traffic for access delay, and improve the throughput of the network.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN915.04

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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本文編號(hào)：2281017