發(fā)布時(shí)間：2018-07-11 21:12

  本文選題：Ad + Hoc網(wǎng)絡(luò)�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：移動(dòng)Ad Hoc網(wǎng)絡(luò)是一種沒有固定網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)、不需要網(wǎng)絡(luò)管理中心、由移動(dòng)終端通過無線鏈路連接而成的自組織、分布式網(wǎng)絡(luò)。無線網(wǎng)絡(luò)環(huán)境的復(fù)雜性和網(wǎng)絡(luò)設(shè)備本身的特性促使非對(duì)稱鏈路的產(chǎn)生。在Ad Hoc網(wǎng)絡(luò)中,按需路由協(xié)議大多以鏈路對(duì)稱為假設(shè)條件,實(shí)際的網(wǎng)絡(luò)中無線設(shè)備間的鏈路會(huì)因網(wǎng)絡(luò)節(jié)點(diǎn)的高移動(dòng)性、網(wǎng)絡(luò)環(huán)境的干擾和傳輸功率的不同而出現(xiàn)不對(duì)稱,此時(shí)傳統(tǒng)的路由協(xié)議將不再適用。那么,如何在多跳鏈路、節(jié)點(diǎn)自由移動(dòng)和無線信號(hào)脆弱的情況下為AdHoc網(wǎng)絡(luò)建立高效路由具有深遠(yuǎn)的研究意義。本文針對(duì)傳統(tǒng)的Ad Hoc路由協(xié)議不能應(yīng)用于非對(duì)稱鏈路的不足,提出了一種基于路徑損耗估計(jì)機(jī)制來快速檢測(cè)和高效處理非對(duì)稱鏈路的路由協(xié)議-AODV-PL。研究的目標(biāo)是如何在較短的時(shí)間內(nèi)用較低的代價(jià)來快速的檢測(cè)出非對(duì)稱鏈路,進(jìn)而尋找鏈路穩(wěn)定度高的傳輸路徑,在兼顧路由性能和網(wǎng)絡(luò)代價(jià)的前提下,提高路徑的連通性和穩(wěn)定性。該協(xié)議是對(duì)傳統(tǒng)的AODV協(xié)議的改進(jìn),在路由發(fā)現(xiàn)階段利用路徑損耗模型預(yù)測(cè)出鏈路的非對(duì)稱特性,同時(shí)節(jié)點(diǎn)依據(jù)鏈路度量因子選擇出穩(wěn)定性較高的路徑。其中鏈路度量因子綜合考慮了節(jié)點(diǎn)的接收信號(hào)強(qiáng)度、鏈路維持時(shí)間和接收信噪比。網(wǎng)絡(luò)節(jié)點(diǎn)的移動(dòng)性極有可能導(dǎo)致斷鏈的節(jié)點(diǎn)就在斷鏈處的附近或者周邊,在路由維護(hù)中,將源路由修復(fù)與本地節(jié)點(diǎn)修復(fù)相結(jié)合,在一定程度上縮短斷鏈的修復(fù)時(shí)間,提高鏈路修復(fù)的成功率。最后,對(duì)AODV-PL路由協(xié)議的性能進(jìn)行了仿真驗(yàn)證與分析。首先通過調(diào)節(jié)低功率節(jié)點(diǎn)的數(shù)目來比較AODV-PL與AODV-Black在數(shù)據(jù)包的投遞率、端到端的時(shí)延以及標(biāo)準(zhǔn)化的負(fù)載上的不同,得出兩種協(xié)議在處理非對(duì)稱鏈路問題的性能差異。其次,隨著網(wǎng)絡(luò)中節(jié)點(diǎn)的數(shù)目的增加,比較傳統(tǒng)的AODV路由協(xié)議與AODV-PL、 AODV-Black路由性能的差異。仿真結(jié)果表明,AODV-PL能夠很好的解決網(wǎng)絡(luò)中非對(duì)稱鏈路的問題,提高了網(wǎng)絡(luò)數(shù)據(jù)的傳輸率,并且有很強(qiáng)的網(wǎng)絡(luò)適用性。
[Abstract]:Mobile Ad Hoc networks are self-organized and distributed networks with no fixed network topology, no network management center, and mobile terminals connected by wireless links. The complexity of wireless network environment and the characteristics of network equipment promote asymmetric links. In Ad Hoc networks, the on-demand routing protocols are mostly referred to as link pairs as hypothetical conditions. In actual networks, the links between wireless devices will be asymmetric due to the high mobility of network nodes, the interference of network environment and the difference of transmission power. At this point, the traditional routing protocol will no longer apply. Therefore, how to establish efficient routing for Ad Hoc networks with multi-hop links, free mobility of nodes and fragile wireless signals has profound significance. Aiming at the disadvantage that the traditional Ad Hoc routing protocol can not be applied to asymmetric links, this paper proposes a routing protocol, AODV-PLV-PLV, which is based on path loss estimation mechanism to detect and process asymmetric links quickly and efficiently. The goal of the research is how to quickly detect asymmetric links in a short time at a lower cost, and then find the transmission path with high link stability, taking into account both routing performance and network cost. Improve the connectivity and stability of the path. This protocol is an improvement on the traditional AODV protocol. In the phase of route discovery, the path loss model is used to predict the asymmetric characteristics of the link, and the node selects the stable path according to the link metric factor. The link metric factor takes into account the received signal strength, link maintenance time and reception signal to noise ratio (SNR). The mobility of the network node is likely to lead to the broken node near or around the broken chain. In the route maintenance, the source route repair and the local node repair are combined to shorten the repair time of the broken chain to a certain extent. Improve the success rate of link repair. Finally, the performance of AODV-PL routing protocol is simulated and analyzed. First, by adjusting the number of low-power nodes, the differences between AODV-PL and AODV-Black in packet delivery rate, end-to-end delay and standardized load are compared, and the performance differences between the two protocols in dealing with asymmetric link problems are obtained. Secondly, with the increase of the number of nodes in the network, the performance differences between the traditional AODV routing protocol and AODV-PLand AODV-Black routing protocol are compared. The simulation results show that AODV-PL can solve the problem of asymmetric link in the network, improve the transmission rate of network data, and have strong applicability.
【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
【分類號(hào)】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 胡曦;李U，

本文編號(hào)：2116348