發(fā)布時(shí)間：2018-11-06 15:38

【摘要】：隨著無(wú)線(xiàn)通信技術(shù)的迅猛發(fā)展,可用的頻譜資源變得越來(lái)越緊張,尤其是隨著無(wú)線(xiàn)局域網(wǎng)、無(wú)線(xiàn)個(gè)域網(wǎng)和無(wú)線(xiàn)城域網(wǎng)等技術(shù)的高速發(fā)展,目前的寬帶無(wú)線(xiàn)應(yīng)用技術(shù)已無(wú)法滿(mǎn)足人們的需求。目前的頻譜分配體制造成了網(wǎng)絡(luò)使用方式僵化、無(wú)線(xiàn)頻譜規(guī)劃緊張,難以滿(mǎn)足未來(lái)網(wǎng)絡(luò)通信技術(shù)智能化、泛在化、融合化的發(fā)展趨勢(shì)。作為認(rèn)知無(wú)線(xiàn)電技術(shù)與自組織網(wǎng)絡(luò)結(jié)合的認(rèn)知自組織網(wǎng)絡(luò),采用頻譜共享的認(rèn)知無(wú)線(xiàn)電系統(tǒng),使網(wǎng)絡(luò)從靜態(tài)工作模式發(fā)展到動(dòng)態(tài)自適應(yīng)模式,在一定程度上解決了頻譜資源短缺的問(wèn)題,提高了網(wǎng)絡(luò)對(duì)環(huán)境的適應(yīng)能力。然而,在認(rèn)知自組織網(wǎng)絡(luò)中,網(wǎng)絡(luò)拓?fù)渚哂袝r(shí)變性,容易形成網(wǎng)絡(luò)孤島,進(jìn)而導(dǎo)致認(rèn)知節(jié)點(diǎn)之間的鏈路頻繁的斷開(kāi),需要中繼節(jié)點(diǎn)以多跳存儲(chǔ)攜帶轉(zhuǎn)發(fā)、接觸關(guān)系預(yù)測(cè)的方式將數(shù)據(jù)包以動(dòng)態(tài)機(jī)會(huì)路由模式轉(zhuǎn)發(fā)至目的節(jié)點(diǎn)。因此,本文采用接觸可預(yù)測(cè)的方法描述不同網(wǎng)絡(luò)孤島間SU節(jié)點(diǎn)間接觸關(guān)系,基于接觸可預(yù)測(cè)的認(rèn)知自組織網(wǎng)絡(luò)的特性,有針對(duì)性地開(kāi)展了以下研究工作:1、在接觸可預(yù)測(cè)的認(rèn)知自組織網(wǎng)絡(luò)可用頻譜與網(wǎng)絡(luò)拓?fù)鋾r(shí)變性的前提下,提出了一種動(dòng)態(tài)多路徑機(jī)會(huì)路由選擇算法-SefRoute。通過(guò)利用電磁場(chǎng)中電場(chǎng)線(xiàn)的分布,初步確定多條不相交路徑的軌跡,結(jié)合社交網(wǎng)絡(luò)中相關(guān)知識(shí),構(gòu)造出節(jié)點(diǎn)之間相遇概率的函數(shù),通過(guò)機(jī)會(huì)連接率將多元社交關(guān)系中的中心性、相似性與信任度三個(gè)重要因素與節(jié)點(diǎn)相遇概率結(jié)合在一起。結(jié)合認(rèn)知自組織網(wǎng)絡(luò)自身的特性構(gòu)造出三個(gè)重要因素的相關(guān)函數(shù),最終在多條不相交路徑軌跡的基礎(chǔ)上確定多路徑機(jī)會(huì)路由。仿真結(jié)果表明所提SefRoute算法在成功傳輸率、時(shí)延等方面均有很好的性能。2、定義了一種鏈路穩(wěn)定度指標(biāo)的度量方法,結(jié)合路徑穩(wěn)定度與業(yè)務(wù)類(lèi)型優(yōu)先級(jí)別提出多路徑路由動(dòng)態(tài)速率分配算法�？紤]用戶(hù)不同類(lèi)型業(yè)務(wù)的性能參數(shù),引入流量感知因子,在保證不同類(lèi)型業(yè)務(wù)對(duì)流量需求的基礎(chǔ)上,將路徑穩(wěn)定性因子考慮在內(nèi),利用數(shù)學(xué)工具-非合作微分博弈建立多路徑路由動(dòng)態(tài)的速率分配模型。構(gòu)造最優(yōu)問(wèn)題并得到最優(yōu)解,仿真分析表明,該算法在不同業(yè)務(wù)對(duì)QoS(服務(wù)質(zhì)量)需求方面有很好的性能。
[Abstract]:With the rapid development of wireless communication technology, the available spectrum resources become increasingly tight, especially with the rapid development of wireless local area network, wireless personal area network and wireless metropolitan area network. The current broadband wireless application technology has been unable to meet the needs of people. The current spectrum allocation system has resulted in rigid network usage and tight wireless spectrum planning, which makes it difficult to meet the development trend of intelligent, ubiquitous and integrated network communication technology in the future. As a combination of cognitive radio technology and ad hoc network, the cognitive ad hoc network uses spectrum sharing cognitive radio system to develop the network from static mode to dynamic adaptive mode. To some extent, the shortage of spectrum resources is solved, and the adaptability of network to environment is improved. However, in cognitive ad hoc networks, the network topology is time-varying, which is easy to form a network island, which leads to frequent disconnection of links between cognitive nodes, which requires relay nodes to be stored and forwarded in multiple hops. Contact relationship prediction forwards packets to the destination node in dynamic opportunity routing mode. Therefore, the contact predictability method is used to describe the contact relationship between SU nodes in different network islands. Based on the characteristics of the contact-predictable cognitive ad hoc networks, the following research works are carried out: 1. In this paper, a dynamic multipath opportunistic routing algorithm, SefRoute., is proposed on the premise of the temporal variability of the available spectrum and the topology of the cognitive ad hoc networks. By using the distribution of electric field lines in the electromagnetic field, the locus of several disjoint paths is preliminarily determined, and the function of the probability of meeting between nodes is constructed by combining the relevant knowledge in the social network, and the centrality of the multivariate social relations is determined by the chance connection rate. Three important factors of similarity and trust are combined with the encounter probability of nodes. Based on the characteristics of cognitive ad hoc networks, the correlation functions of three important factors are constructed. Finally, the opportunity routing of multiple paths is determined on the basis of multiple disjoint paths. The simulation results show that the proposed SefRoute algorithm has good performance in the aspects of successful transmission rate and delay. Combining path stability with traffic type priority, a dynamic rate allocation algorithm for multipath routing is proposed. Considering the performance parameters of different types of services and introducing a traffic awareness factor, the path stability factor is taken into account on the basis of ensuring the traffic requirements of different types of services. A dynamic rate allocation model of multipath routing is established by using non-cooperative differential game, which is a mathematical tool. The optimal problem is constructed and the optimal solution is obtained. The simulation results show that the algorithm has good performance in different traffic requirements for QoS (quality of Service).
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN925

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