發(fā)布時(shí)間：2018-06-01 11:40

  本文選題：無(wú)線自組織網(wǎng)絡(luò) + 定向隨機(jī)接入��； 參考：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：無(wú)線自組織網(wǎng)絡(luò)不需要固定基礎(chǔ)設(shè)施支撐,組網(wǎng)快速靈活,抗毀性強(qiáng),在軍事和民用領(lǐng)域均有廣闊的應(yīng)用前景。研究人員將定向天線技術(shù)引入無(wú)線自組網(wǎng),有效降低了信號(hào)沖突,提高了網(wǎng)絡(luò)空分復(fù)用度和網(wǎng)絡(luò)飽和吞吐量。然而,定向傳輸引起的“聾”問題和定向隱藏終端問題造成的數(shù)據(jù)沖突會(huì)對(duì)業(yè)務(wù)流的飽和吞吐量產(chǎn)生什么樣的影響?如何針對(duì)定向無(wú)線自組網(wǎng)隨機(jī)接入?yún)f(xié)議的飽和吞吐量進(jìn)行建模與分析?如何進(jìn)一步降低沖突,提升定向飽和吞吐量性能?現(xiàn)有的研究工作尚未能給出令人完全滿意的答案。本文的研究工作即緊密圍繞上述問題展開,取得的主要?jiǎng)?chuàng)新性成果包括:(1)提出了一種定向隨機(jī)接入?yún)f(xié)議飽和吞吐量模型。本文首先分析了“聾”問題和定向隱藏終端問題導(dǎo)致的定向無(wú)線自組織網(wǎng)絡(luò)數(shù)據(jù)傳輸沖突。然后,針對(duì)典型定向無(wú)線自組織網(wǎng)絡(luò)隨機(jī)接入?yún)f(xié)議D-MAC,提出了基于馬爾可夫鏈的定向隨機(jī)接入?yún)f(xié)議飽和吞吐量模型,為定向接入?yún)f(xié)議性能優(yōu)化提供了理論依據(jù)。該模型通過計(jì)算任一時(shí)隙中節(jié)點(diǎn)向任一波束方向發(fā)送數(shù)據(jù)的概率及定向沖突概率,得出了網(wǎng)絡(luò)飽和吞吐量的理論值。以該模型為基礎(chǔ),本文分析了定向天線波束數(shù)量、網(wǎng)絡(luò)節(jié)點(diǎn)數(shù)量、隨機(jī)退避競(jìng)爭(zhēng)窗口等參數(shù)對(duì)網(wǎng)絡(luò)總吞吐量的影響,并重點(diǎn)研究了給定網(wǎng)絡(luò)拓?fù)錀l件下,由于數(shù)據(jù)傳輸沖突導(dǎo)致的不同業(yè)務(wù)流飽和吞吐量的差異性。仿真結(jié)果與數(shù)值結(jié)果的對(duì)比證明了模型的有效性。(2)設(shè)計(jì)了一種基于忙音輔助的定向無(wú)線自組織網(wǎng)絡(luò)接入?yún)f(xié)議。該協(xié)議采用了忙音輔助策略避免“聾”問題和定向隱藏終端問題導(dǎo)致的數(shù)據(jù)傳輸沖突。節(jié)點(diǎn)通過發(fā)送全向RTS幀和定向CTS幀完成鄰居之間的定向波束對(duì)準(zhǔn);在數(shù)據(jù)交互過程中,發(fā)送節(jié)點(diǎn)和接收節(jié)點(diǎn)通過定向發(fā)送“發(fā)忙音信號(hào)”和“收忙音信號(hào)”避免數(shù)據(jù)幀沖突,通過多波束定向發(fā)送“聾忙音信號(hào)”避免“聾”問題導(dǎo)致的數(shù)據(jù)幀的重傳以及多條鏈路吞吐量之間的不公平性問題,并實(shí)現(xiàn)了網(wǎng)絡(luò)中其余節(jié)點(diǎn)基于忙音偵聽的并發(fā)定向數(shù)據(jù)傳輸。多種網(wǎng)絡(luò)拓?fù)錀l件下的仿真結(jié)果證明,本文提出的忙音輔助策略能有效避免“聾”問題和定向隱藏終端問題導(dǎo)致的數(shù)據(jù)傳輸沖突,鏈路公平性和網(wǎng)絡(luò)吞吐量性能優(yōu)于傳統(tǒng)的定向忙音輔助信道接入控制協(xié)議。
[Abstract]:Wireless ad hoc networks do not need fixed infrastructure support, fast and flexible networking, strong invulnerability, and have broad application prospects in both military and civil fields. The directional antenna technology is introduced into wireless ad hoc networks, which can effectively reduce the signal collision, improve the spatial division multiplexing degree and saturated throughput of the network. However, what effect will the data conflict caused by the "deaf" problem caused by directional transmission and the problem of directional hidden terminal have on the saturated throughput of traffic? How to model and analyze the saturated throughput of random access protocols in directed wireless ad hoc networks? How to further reduce conflicts and improve the performance of directional saturation throughput? Existing research has yet to provide a fully satisfactory answer. The research work in this paper is focused on the above problems. The main innovative results obtained include: 1) A saturated throughput model for directional random access protocols is proposed. In this paper, the problem of "deafness" and the problem of directional hidden terminal are analyzed firstly. Then, the saturated throughput model of directed random access protocol based on Markov chain is proposed for D-MAC, which provides a theoretical basis for the performance optimization of directional access protocols. By calculating the probability of transmitting data to any beam in any time slot and the probability of directional collision, the theoretical value of the saturated throughput of the network is obtained. Based on this model, the effects of the number of directional antenna beams, the number of network nodes and the random Backoff contention window on the total throughput of the network are analyzed in this paper. The difference of saturated throughput of different traffic due to data transmission conflict. The comparison between simulation and numerical results proves the validity of the model. (2) A new directional wireless ad hoc network access protocol based on busy tone is designed. This protocol adopts busy tone assistant strategy to avoid data transmission conflicts caused by "deafness" problem and directional hidden terminal problem. The node accomplishes directional beam alignment between neighbors by sending omnidirectional RTS frames and directional CTS frames. In the process of data interaction, the transmitting node and receiving node avoid data frame collision by sending "busy tone signal" and "receiving busy tone signal" by directionally transmitting "busy tone signal" and "receiving busy tone signal". Transmission of "deaf busy tone signals" through multi-beam orientation to avoid retransmission of data frames caused by "deafness" and unfairness between throughput of multiple links, And the other nodes in the network based on the busy tone listening concurrent directional data transmission. The simulation results under various network topologies show that the proposed busy tone auxiliary strategy can effectively avoid the data transmission conflicts caused by the problem of "deafness" and the problem of directional hidden terminals. Link fairness and network throughput performance are superior to the traditional directional busy tone auxiliary channel access control protocol.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5

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本文編號(hào)：1964053