基于STDMA的鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)的研究及實(shí)現(xiàn)
發(fā)布時(shí)間：2018-04-20 04:09
本文選題：無線mesh網(wǎng)絡(luò) + 鏈?zhǔn)?/strong>�。� 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文
【摘要】：無線mesh網(wǎng)絡(luò)的自組織特點(diǎn)滿足物聯(lián)網(wǎng)對(duì)節(jié)點(diǎn)具有自主管理能力的要求。MAC層接入機(jī)制的表現(xiàn)會(huì)直接影響網(wǎng)絡(luò)的性能,CSMA和TDMA常被無線mesh網(wǎng)絡(luò)作為MAC層接入機(jī)制。相關(guān)研究表明TDMA接入機(jī)制相比于CSMA接入機(jī)制更適用于距離遠(yuǎn)跳數(shù)多的網(wǎng)絡(luò)場(chǎng)景,例如河流,海岸線,公路,國(guó)家陸地邊界和地下礦山隧道,這些場(chǎng)景的地理性質(zhì)要求mesh路由器的部署應(yīng)嚴(yán)格按照狹長(zhǎng)的鏈?zhǔn)椒绞?該場(chǎng)景又被稱為鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)。雖然TDMA機(jī)制能提升鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)的性能,但其為每個(gè)節(jié)點(diǎn)分配不同的時(shí)隙的方式造成信道的浪費(fèi)。因此,提高TDMA信道利用率是研究的核心和重點(diǎn)。首先,本文對(duì)無線mesh網(wǎng)絡(luò)中的CSMA和TDMA接入機(jī)制進(jìn)行歸納總結(jié),介紹了TDMA接入機(jī)制相比于CSMA更適合跳數(shù)多的鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)。因?yàn)槎说蕉藭r(shí)延常被用來評(píng)價(jià)無線mesh網(wǎng)絡(luò)的性能,所以本文分別從數(shù)學(xué)理論和仿真模擬對(duì)比CSMA和TDMA接入機(jī)制在鏈?zhǔn)綗o線mesh網(wǎng)路中的端到端時(shí)延。其中,端到端時(shí)延數(shù)學(xué)理論基于排隊(duì)論提出,理論公式分別反映了數(shù)據(jù)包沖突和數(shù)據(jù)包排隊(duì)等待時(shí)間是影響CSMA和TDMA端到端時(shí)延的主要原因。通過比較端到端時(shí)延,驗(yàn)證了TDMA接入機(jī)制更適合距離遠(yuǎn)跳數(shù)多的鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)。其次,使用空間復(fù)用技術(shù)來解決傳統(tǒng)TDMA浪費(fèi)信道的問題。利用數(shù)學(xué)理論和仿真模擬在端到端時(shí)延方面驗(yàn)證空間復(fù)用TDMA優(yōu)于傳統(tǒng)TDMA,并指出數(shù)據(jù)包排隊(duì)等待的時(shí)間少是空間復(fù)用TDMA端到端時(shí)延小的主要原因。針對(duì)無線mesh網(wǎng)絡(luò)中關(guān)于空間復(fù)用TDMA研究方法不適用于鏈?zhǔn)骄W(wǎng)絡(luò)結(jié)構(gòu)的問題,本文基于空間復(fù)用TDMA理論,聯(lián)合AODV路由協(xié)議的hello消息,提出自適應(yīng)STDMA接入機(jī)制。該機(jī)制不需要事先人為的為每個(gè)節(jié)點(diǎn)分配時(shí)隙,只需通過交換hello消息自適應(yīng)的完成節(jié)點(diǎn)時(shí)隙的分配。最后,在NS2仿真工具中實(shí)現(xiàn)了提出的自適應(yīng)STDMA接入機(jī)制,并通過myEvalvid視頻質(zhì)量評(píng)價(jià)工具驗(yàn)證了提出的自適應(yīng)STDMA接入機(jī)制相比于CSMA和TDMA接入機(jī)制更適用于距離遠(yuǎn)跳數(shù)多的鏈?zhǔn)綗o線mesh網(wǎng)絡(luò)。
[Abstract]:The self organization characteristics of wireless mesh network meet the independent management ability of the Internet of things for nodes. The performance of the.MAC layer access mechanism will directly affect the performance of the network. CSMA and TDMA are often used as MAC layer access mechanism by wireless mesh network. The related research shows that the TDMA access mechanism is more suitable for the distance far jump than the CSMA access mechanism. Network scenarios such as rivers, coastlines, highways, national land boundaries and underground mine tunnels, the geographical nature of these scenarios requires that the deployment of mesh routers should be strictly in a narrow chain, and the scene is called chain wireless mesh network. Although the TDMA mechanism can improve the performance of the chain wireless mesh network, it is for each section The way to allocate different time slots causes the waste of channel. Therefore, improving the utilization of TDMA channel is the core and key of the research. Firstly, this paper sums up the CSMA and TDMA access mechanism in the wireless mesh network, and introduces the TDMA access mechanism which is more suitable for the chain wireless mesh network with more hops than CSMA. Because of the end to end delay. It is often used to evaluate the performance of the wireless mesh network, so this paper compares the end to end delay of the CSMA and TDMA access mechanism in the chain wireless mesh network from the mathematical theory and the simulation simulation. Among them, the end to end delay mathematics theory is based on the queuing theory, and the theoretical formulas reflect the packet conflict and the queue waiting time respectively. The main reason that affects the end to end delay of CSMA and TDMA is that by comparing end-to-end delay, it is proved that the TDMA access mechanism is more suitable for the chain wireless mesh network with many distance far jump. Secondly, the space multiplexing technology is used to solve the problem of the waste of the traditional TDMA channel. The space complex is verified by using the mathematical theory and the imitation real simulation in the end to end delay. TDMA is better than traditional TDMA, and it is pointed out that the time of queue waiting for data packets is less than that of TDMA end to end delay of space multiplexing. The problem that the method of spatial multiplexing TDMA research is not suitable for chain network structure in wireless mesh network. Based on the spatial reuse TDMA theory, the Hello message of the AODV routing protocol is proposed from the Hello message of the AODV routing protocol. The mechanism is adapted to the STDMA access mechanism. The mechanism does not need to allocate the time slot artificially for each node in advance, only by exchanging the assignment of the node time slot of the completion node of the Hello message adaptively. Finally, the proposed adaptive STDMA access mechanism is implemented in the NS2 simulation tool, and the proposed adaptive STD is verified by the myEvalvid visual quality evaluation tool. Compared with the CSMA and TDMA access mechanism, the MA access mechanism is more suitable for chain mesh networks with far distance.
【學(xué)位授予單位】：中國(guó)礦業(yè)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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