【摘要】：隨著智能電網(wǎng)、智能醫(yī)療、環(huán)境監(jiān)測(cè)、安防監(jiān)控等適用于物聯(lián)網(wǎng)的無(wú)線局域網(wǎng)業(yè)務(wù),以及增強(qiáng)局部范圍內(nèi)人與人之間溝通的新型近域互聯(lián)的快速發(fā)展,無(wú)線局域網(wǎng)需要更高密度、更大規(guī)模的部署,即能夠支持更多用戶,更大的覆蓋范圍,更靈活的組網(wǎng)方案。其中智能電網(wǎng)等都要求無(wú)線局域網(wǎng)能夠支持單個(gè)小區(qū)范圍內(nèi)6000個(gè)節(jié)點(diǎn)的短分組、突發(fā)業(yè)務(wù)的傳輸,所以,有效靈活的組網(wǎng)方案是保證系統(tǒng)高吞吐量以及高效無(wú)線資源利用率的關(guān)鍵。本文針對(duì)高密度無(wú)線局域網(wǎng)的組網(wǎng)方案問(wèn)題,進(jìn)行了如下研究：1.本文針對(duì)高密度無(wú)線局域網(wǎng)中邊緣節(jié)點(diǎn)速率過(guò)低以及密集AP中同頻干擾嚴(yán)重而導(dǎo)致整個(gè)網(wǎng)絡(luò)吞吐量過(guò)低問(wèn)題進(jìn)行了深入分析,提出了用于無(wú)線局域網(wǎng)中邊緣節(jié)點(diǎn)多跳路徑和信道選擇方法,即以其他工作站點(diǎn)作為中繼節(jié)點(diǎn),連接到接入點(diǎn)時(shí),多跳路徑和信道選擇的方法,以滿足邊緣工作站點(diǎn)的速率需求,防止邊緣工作站點(diǎn)對(duì)網(wǎng)絡(luò)資源的低效利用,提高頻譜利用率和網(wǎng)絡(luò)的性能。2.在邊緣節(jié)點(diǎn)完成多跳路徑和信道選擇的基礎(chǔ)上,本文針對(duì)高密度無(wú)線局域網(wǎng)中的802.11協(xié)議性能進(jìn)行了分析,并仿真指出在支持6000個(gè)節(jié)點(diǎn)的單小區(qū)中采用原有無(wú)線局域網(wǎng)協(xié)議存在網(wǎng)絡(luò)吞吐量過(guò)低的問(wèn)題。在多跳組網(wǎng)基礎(chǔ)上,提出了基于Relay的高密度無(wú)線局域網(wǎng)組網(wǎng)方案,通過(guò)改變微小區(qū)個(gè)數(shù)來(lái)比較不同微小區(qū)個(gè)數(shù)時(shí)系統(tǒng)吞吐量的變化,最終選擇的組網(wǎng)方案使得網(wǎng)絡(luò)吞吐量達(dá)到最大,系統(tǒng)性能達(dá)到最優(yōu)。3.本文通過(guò)仿真驗(yàn)證了該組網(wǎng)方案的性能,結(jié)果表明該組網(wǎng)方案大大提高了網(wǎng)絡(luò)吞吐量,并一定程度上減小了節(jié)點(diǎn)能耗。最后通過(guò)搭建Linux關(guān)鍵技術(shù)演示平臺(tái),用QT對(duì)組網(wǎng)方案的可行性和有效性進(jìn)行了驗(yàn)證。
[Abstract]:With the rapid development of smart grid, smart medical treatment, environmental monitoring, security monitoring and other WLAN services suitable for the Internet of things, as well as the rapid development of a new type of near-domain interconnection that enhances interpersonal communication in local areas, WLAN needs higher density and larger deployment, that is, it can support more users, wider coverage, and more flexible networking schemes. The smart grid and so on require WLAN to be able to support the transmission of short packets and burst services of 6,000 nodes in a single cell, so, Effective and flexible networking scheme is the key to ensure high throughput and efficient utilization of wireless resources. In this paper, the scheme of high density wireless local area network is studied as follows: 1. In this paper, the low rate of edge nodes in high density WLAN and the serious co-frequency interference in dense AP cause the problem of low throughput of the whole network. In this paper, a multi-hop path and channel selection method for edge nodes in WLAN is proposed, that is, when other work stations are used as relay nodes to connect to access points, multi-hop paths and channels are selected. In order to meet the rate demand of the edge work site, prevent the low efficiency utilization of the network resource, improve the spectrum efficiency and the network performance. 2. Based on the completion of multi-hop path and channel selection by edge nodes, the performance of 802.11 protocol in high density wireless LAN is analyzed in this paper. The simulation results show that the network throughput is too low by using the original WLAN protocol in a single cell with 6000 nodes. On the basis of multi-hop networking, a scheme of high-density WLAN networking based on Relay is proposed. By changing the number of micro-areas, the system throughput is compared when the number of micro-areas is different. The final networking scheme makes the network throughput reach the maximum, and the system performance reaches the optimum. 3. 3. The performance of the scheme is verified by simulation in this paper. The results show that the scheme greatly improves the network throughput and reduces the node energy consumption to a certain extent. Finally, the feasibility and effectiveness of the scheme are verified by setting up the demonstration platform of Linux key technology and using QT.
【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)】：TN925.93

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