本文選題：異構(gòu)融合網(wǎng)絡(luò)　切入點(diǎn)：負(fù)載均衡　出處：《東北大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著無(wú)線通信技術(shù)的發(fā)展和新的無(wú)線接入技術(shù)的出現(xiàn),異構(gòu)無(wú)線網(wǎng)絡(luò)融合成為下一代無(wú)線通信系統(tǒng)的重要特征之一。負(fù)載均衡作為異構(gòu)融合網(wǎng)絡(luò)無(wú)線資源管理的關(guān)鍵技術(shù),能夠提高系統(tǒng)的無(wú)線資源利用率,有效避免系統(tǒng)性能惡化,提升系統(tǒng)服務(wù)質(zhì)量,因此對(duì)負(fù)載均衡技術(shù)的研究具有十分重要的理論價(jià)值和實(shí)際意義。本文首先介紹了異構(gòu)融合網(wǎng)絡(luò)的基本理論,闡述了負(fù)載均衡的三種關(guān)鍵技術(shù),深入研究了異構(gòu)融合網(wǎng)絡(luò)環(huán)境下的負(fù)載均衡算法,并對(duì)現(xiàn)有算法的優(yōu)缺點(diǎn)進(jìn)行分析和比較,在此基礎(chǔ)上提出了有效的適于實(shí)際應(yīng)用的負(fù)載均衡算法。針對(duì)現(xiàn)有負(fù)載均衡算法在準(zhǔn)入控制方面存在滯后性和被動(dòng)性的問題,提出了基于預(yù)測(cè)的動(dòng)態(tài)負(fù)載均衡算法。利用互信息理論對(duì)異構(gòu)融合系統(tǒng)中各個(gè)網(wǎng)絡(luò)的負(fù)載狀況進(jìn)行預(yù)測(cè),再依據(jù)所預(yù)測(cè)的結(jié)果最小化各個(gè)網(wǎng)絡(luò)之間負(fù)載率方差,建立業(yè)務(wù)準(zhǔn)入的優(yōu)化控制模型,并通過遺傳算法求得最優(yōu)方案。所提算法能夠降低RT業(yè)務(wù)平均阻塞率,減少NRT業(yè)務(wù)平均傳輸時(shí)間,提高準(zhǔn)入控制的實(shí)時(shí)性和主動(dòng)性,提高系統(tǒng)服務(wù)質(zhì)量。仿真實(shí)驗(yàn)表明,與傳統(tǒng)算法相比,基于預(yù)測(cè)的動(dòng)態(tài)負(fù)載均衡算法能夠高效利用無(wú)線網(wǎng)絡(luò)資源,改善系統(tǒng)負(fù)載均衡水平。針對(duì)現(xiàn)有負(fù)載均衡算法在負(fù)載轉(zhuǎn)移方面存在著頻繁切換問題,提出了基于綜合效用的負(fù)載均衡算法。通過構(gòu)造適用于不同業(yè)務(wù)的效用函數(shù),并利用三角模算子對(duì)不同效用函數(shù)進(jìn)行融合得到候選網(wǎng)絡(luò)的綜合效用函數(shù),提高了目標(biāo)網(wǎng)絡(luò)的綜合評(píng)估性能,利用輔助動(dòng)態(tài)轉(zhuǎn)移因子制定合理的負(fù)載業(yè)務(wù)轉(zhuǎn)移量,將重載網(wǎng)絡(luò)中的負(fù)載業(yè)務(wù)通過垂直切換轉(zhuǎn)移到輕載網(wǎng)絡(luò)中,有效地減少了業(yè)務(wù)切換的次數(shù),提高了資源利用率,改善了通信系統(tǒng)的傳輸性能。仿真實(shí)驗(yàn)驗(yàn)證了算法的有效性和優(yōu)越性。
[Abstract]:With the development of wireless communication technology and the emergence of new wireless access technology, heterogeneous wireless network convergence has become one of the important features of the next generation wireless communication system. Load balancing is the key technology of heterogeneous convergence network wireless resource management. It can improve the utilization rate of wireless resources, effectively avoid the deterioration of system performance, and improve the quality of service of the system. Therefore, the research of load balancing technology has very important theoretical value and practical significance. Firstly, this paper introduces the basic theory of heterogeneous fusion network, and expounds three key technologies of load balancing. In this paper, the load balancing algorithm in heterogeneous fusion network environment is deeply studied, and the advantages and disadvantages of the existing algorithms are analyzed and compared. On the basis of this, an effective load balancing algorithm suitable for practical application is put forward, aiming at the problem of lag and passivity in the access control of the existing load balancing algorithm. A dynamic load balancing algorithm based on prediction is proposed. The load condition of each network in heterogeneous fusion system is predicted by mutual information theory, and the variance of load rate is minimized according to the predicted results. The optimal control model of service access is established, and the optimal scheme is obtained by genetic algorithm. The proposed algorithm can reduce the average blocking rate of RT services, reduce the average transmission time of NRT services, and improve the real-time and initiative of admission control. Simulation results show that compared with traditional algorithms, dynamic load balancing algorithm based on prediction can make efficient use of wireless network resources. In order to solve the problem of frequent switching between existing load balancing algorithms in load transfer, a load balancing algorithm based on comprehensive utility is proposed. The comprehensive utility function of candidate networks is obtained by combining different utility functions with triangular modular operators, which improves the comprehensive evaluation performance of the target networks, and makes use of auxiliary dynamic transfer factors to formulate a reasonable load traffic transfer amount. The load service in the heavy load network is transferred to the light load network by vertical switching, which effectively reduces the number of service switching and improves the resource utilization. The transmission performance of the communication system is improved and the effectiveness and superiority of the algorithm are verified by simulation experiments.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN92

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