本文關(guān)鍵詞：無(wú)線Mesh網(wǎng)絡(luò)多媒體傳輸QoS路由與MAC層策略研究　出處：《中南大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 無(wú)線Mesh網(wǎng)絡(luò) 多媒體 服務(wù)質(zhì)量 802.11e

【摘要】：摘要：隨著無(wú)線設(shè)備制造成本的下降以及各種無(wú)線通信技術(shù)的成熟應(yīng)用,作為下一代寬帶接入的重要技術(shù)之一的無(wú)線Mesh網(wǎng)絡(luò)已被廣泛應(yīng)用于無(wú)線寬帶城市、無(wú)線校園(企業(yè))和抗災(zāi)搶險(xiǎn)等領(lǐng)域。與此同時(shí),基于無(wú)線Mesh網(wǎng)絡(luò)的各種音頻、視頻和高實(shí)時(shí)性數(shù)據(jù)業(yè)務(wù)(如VOIP、視頻會(huì)議等)在商業(yè)應(yīng)用上的迅速發(fā)展,使得人們對(duì)無(wú)線Mesh網(wǎng)絡(luò)數(shù)據(jù)傳輸?shù)母黜?xiàng)QoS指標(biāo)(如平均延遲、延遲抖動(dòng)、帶寬分配等)提出了更高的要求。然而,無(wú)線Mesh網(wǎng)絡(luò)MAC層的分布式自由競(jìng)爭(zhēng)模式、節(jié)點(diǎn)對(duì)全網(wǎng)信息掌握的不完全性等固有特性,都使得現(xiàn)有無(wú)線(有線)網(wǎng)絡(luò)所采用的QoS保障技術(shù)很難直接應(yīng)用于無(wú)線Mesh網(wǎng)絡(luò)及其上的多媒體業(yè)務(wù)傳輸,因此,QoS保障問(wèn)題是仍然是目前無(wú)線Mesh網(wǎng)絡(luò)研究的熱點(diǎn)和難點(diǎn)問(wèn)題。 本文從無(wú)線Mesh網(wǎng)絡(luò)的MAC層、網(wǎng)絡(luò)層和跨層設(shè)計(jì)的不同角度,對(duì)QoS保障策略進(jìn)行了相關(guān)的分析研究,并提出了相應(yīng)的解決方案。主要的研究工作包括以下幾個(gè)部分： (1)針對(duì)802.11e的EDCA機(jī)制和單路徑路由協(xié)議在QoS保障方面的不足,從跨層優(yōu)化的角度,提出了一種優(yōu)先級(jí)自適應(yīng)的QoS路由策略。該策略通過(guò)在網(wǎng)絡(luò)上層設(shè)定各類數(shù)據(jù)流傳輸?shù)腝oS閾值,并在網(wǎng)絡(luò)層對(duì)MAC層AC隊(duì)列的狀態(tài)信息進(jìn)行實(shí)時(shí)監(jiān)控,來(lái)動(dòng)態(tài)調(diào)整不同業(yè)務(wù)數(shù)據(jù)包的優(yōu)先級(jí)別,同時(shí)在MAC對(duì)不同業(yè)務(wù)數(shù)據(jù)包的傳輸時(shí)延進(jìn)行估算,以獲取數(shù)據(jù)成功發(fā)送后不同AC隊(duì)列的平均時(shí)延,并對(duì)隊(duì)列的平均沖突概率進(jìn)行統(tǒng)計(jì),以自適應(yīng)地調(diào)整各隊(duì)列的信道競(jìng)爭(zhēng)參數(shù),從而更好地平衡不同類型業(yè)務(wù)流占用信道機(jī)會(huì),以保證不同業(yè)務(wù)流之間的傳輸公平性,提升網(wǎng)絡(luò)的整體傳輸效率。 (2)針對(duì)多路徑相鄰鏈路之間的干擾對(duì)數(shù)據(jù)傳輸質(zhì)量帶來(lái)的相關(guān)問(wèn)題,在現(xiàn)有802.11e標(biāo)準(zhǔn)EDCA機(jī)制和多路徑路由相關(guān)問(wèn)題分析的基礎(chǔ)上,利用跨層優(yōu)化的設(shè)計(jì)思想,定義了適應(yīng)于多業(yè)務(wù)多路徑傳輸?shù)穆?lián)合路由判據(jù),使網(wǎng)絡(luò)層的路由選擇策略能夠根據(jù)多媒體數(shù)據(jù)的業(yè)務(wù)類型和聯(lián)合路由判據(jù)估算出的當(dāng)前可用路徑的狀態(tài)與質(zhì)量信息,合理地選擇能滿足不同業(yè)務(wù)類型QoS要求的數(shù)據(jù)傳輸路徑,同時(shí)對(duì)EDCA靜態(tài)的信道競(jìng)爭(zhēng)參數(shù)分配方案進(jìn)行了自適應(yīng)改進(jìn),使其能適應(yīng)于無(wú)線多跳的數(shù)據(jù)傳輸環(huán)境,減少了網(wǎng)絡(luò)中數(shù)據(jù)包傳輸?shù)臎_突,有效地提高和滿足了各類媒體業(yè)務(wù)數(shù)據(jù)的傳輸質(zhì)量,以及網(wǎng)絡(luò)傳輸?shù)墓叫浴?(3)針對(duì)802.11e的EDCA機(jī)制在業(yè)務(wù)區(qū)分時(shí)未能提供良好的QoS保證的問(wèn)題,提出了一種基于剩余時(shí)延界限的CFB數(shù)據(jù)包轉(zhuǎn)發(fā)機(jī)制,該機(jī)制在現(xiàn)有802.11e EDCA機(jī)制的基礎(chǔ)上,針對(duì)由于具有較大時(shí)延界限的數(shù)據(jù)流長(zhǎng)期占用傳輸信道,而導(dǎo)致具有較低時(shí)延界限數(shù)據(jù)流出現(xiàn)大量丟包、重傳,從而影響整個(gè)網(wǎng)絡(luò)的吞吐量及多數(shù)據(jù)流傳輸?shù)墓叫詥?wèn)題,通過(guò)估算數(shù)據(jù)包的剩余時(shí)延,以及動(dòng)態(tài)調(diào)整TXOP的時(shí)長(zhǎng)及CFB突發(fā)數(shù)據(jù)塊的大小,來(lái)自適應(yīng)網(wǎng)絡(luò)中多優(yōu)先級(jí)業(yè)務(wù)流量的變化,有效地提高了網(wǎng)絡(luò)中各類業(yè)務(wù)數(shù)據(jù)流的吞吐量。
[Abstract]:Abstract: with the mature application of wireless equipment decreased manufacturing costs and a variety of wireless communication technology, as one of the most important technologies in the next generation broadband access Mesh wireless network has been widely applied in wireless broadband wireless city, campus (enterprise) and disaster rescue and other fields. At the same time, a variety of audio and video based on wireless Mesh network, and high real-time data services (such as VOIP, video conferencing, etc.) in the rapid development of the commercial application, the QoS index of Mesh wireless network data transmission makes people (such as average delay, delay jitter, bandwidth allocation etc.) put forward higher requirements. However, distributed free competition mode in wireless Mesh network MAC layer the node of the inherent information of the whole network of incomplete features, makes the existing wireless (wired) QoS security technology network used is difficult to directly apply to Mesh network and its on line As a result, the problem of QoS guarantee is still a hot and difficult problem in the research of wireless Mesh network.
From the perspective of MAC layer, network layer and cross layer design of wireless Mesh network, this paper analyzes and studies QoS guarantee strategy and proposes corresponding solutions. The main research work includes the following parts.
(1) according to the EDCA mechanism of 802.11e and single path routing protocol in QoS security problems, from the angle of cross layer optimization, proposed a priority adaptive QoS routing strategy. This strategy by setting the QoS thresholds of the various data stream transmission in the network layer, and real-time monitoring in the network layer of the MAC layer AC the queue state information to dynamically adjust the priority level of different business data packets, and packet transmission delay of business data in MAC were estimated, the average delay for data delivery after different AC queue, and the queue average collision probability statistics, to adaptively adjust the parameters of the queue channel competition thus, a better balance of different traffic flow channel opportunities, in order to guarantee the transmission fairness between different business flow, improve the overall efficiency of the transmission network.
(2) for issues related to multipath interference between adjacent links for data transmission quality, analyzing the related problems in the existing 802.11e standard EDCA mechanism and multi path routing, the design idea of cross layer optimization, combined with routing criterion adapted to multi service multi path transmission is defined, the network layer routing according to the state selection strategy and quality of information currently available path of business types and combined routing of multimedia data to estimate the reasonable selection of data transmission path QoS to meet the requirements of different business types, channel competition parameter allocation scheme for static EDCA at the same time to improve the adaptive, so that it can adapt to the data transmission environment wireless multi hop, reduce the packet collision in transmission network, effectively improve the transmission quality and meet all kinds of media business data, and network transmission Fairness.
(3) provide a good QoS guarantee to solve the problem of EDCA mechanism of 802.11e failed to distinguish between business and CFB data is proposed based on residual delay limits packet forwarding mechanism, this mechanism based on the existing 802.11e EDCA mechanism, according to the limit of time delay due to their large data stream transmission channel has long occupied. The emergence of a large number of flow loss, the lower limit of time delay caused data retransmission, thus affecting the fairness of the throughput of the whole network and multi data stream transmission, the remaining delay by estimating the data packets, and dynamically adjust the TXOP time and CFB burst data block size, adapt to changes in the network from multi priority traffic. To effectively improve the various types of business data flow in the network throughput.

【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李世勇;秦雅娟;張宏科;;基于網(wǎng)絡(luò)效用最大化的一體化網(wǎng)絡(luò)服務(wù)層映射模型[J];電子學(xué)報(bào);2010年02期

2 朱穎;武穆清;;基于802.11e的無(wú)線多跳自適應(yīng)合作式QoS算法[J];電子學(xué)報(bào);2010年10期

3 張暉;董育寧;楊龍祥;朱洪波;;多媒體異構(gòu)Mesh網(wǎng)絡(luò)體系設(shè)計(jì)及跨層QoS路由算法研究[J];電子學(xué)報(bào);2010年10期

4 任娟;裘正定;;多信道無(wú)線Mesh網(wǎng)絡(luò)中基于路徑尺度的負(fù)載平衡路由[J];計(jì)算機(jī)研究與發(fā)展;2008年12期

5 羅娟;潘陳;李仁發(fā);;無(wú)線Mesh網(wǎng)絡(luò)中多射頻多信道MAC機(jī)制設(shè)計(jì)[J];計(jì)算機(jī)研究與發(fā)展;2012年02期

6 顧金媛;章國(guó)安;包志華;;認(rèn)知無(wú)線Mesh網(wǎng)絡(luò)聯(lián)合多路徑路由和信道分配策略[J];計(jì)算機(jī)科學(xué);2011年05期

7 王魯光;賈智平;李新;;AODV和AOMDV路由協(xié)議性能分析與比較[J];計(jì)算機(jī)應(yīng)用;2010年03期

8 何萍實(shí);徐子平;楊峽;;多信道IEEE 802.11無(wú)線Mesh網(wǎng)絡(luò)中路由度量算法研究[J];計(jì)算機(jī)應(yīng)用研究;2010年10期

9 姜桂艷;代磊磊;白竹;趙佳琪;鄭祖舵;;城市主干路常發(fā)性擁擠擴(kuò)散規(guī)律的模擬研究[J];交通與計(jì)算機(jī);2006年01期

10 陸文彥;賈維嘉;杜文峰;張歷卓;;IEEE 802．16競(jìng)爭(zhēng)解決方案的性能分析[J];軟件學(xué)報(bào);2007年09期

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