【摘要】：通信網(wǎng)絡(luò)技術(shù)與無(wú)線業(yè)務(wù)的發(fā)展日新月異,共同推動(dòng)無(wú)線接入技術(shù)和移動(dòng)終端技術(shù)的演進(jìn)。在無(wú)線接入異構(gòu)化、移動(dòng)終端多�；尿�(qū)動(dòng)下,未來(lái)無(wú)線通信系統(tǒng)的重要發(fā)展趨勢(shì)將是異構(gòu)、融合與協(xié)同,它將集成和管理多種異構(gòu)無(wú)線接入網(wǎng)絡(luò),為多模終端提供泛在的異構(gòu)無(wú)線接入環(huán)境,充分滿足用戶在不同應(yīng)用場(chǎng)景下日益增長(zhǎng)的業(yè)務(wù)需求。因此,無(wú)線資源管理是實(shí)現(xiàn)異構(gòu)無(wú)線融合網(wǎng)絡(luò)有序組織和高效利用的關(guān)鍵技術(shù)。在分層異構(gòu)網(wǎng)絡(luò)中,無(wú)線資源管理需要從整體上綜合考慮網(wǎng)絡(luò)中各種無(wú)線資源的分配和使用;利用重配置技術(shù),通過(guò)業(yè)務(wù)測(cè)量,進(jìn)行不同接入網(wǎng)絡(luò)間的業(yè)務(wù)分流,對(duì)異構(gòu)網(wǎng)絡(luò)中具有不同特性的接入網(wǎng)絡(luò)進(jìn)行聯(lián)合接入控制和資源調(diào)度;在滿足業(yè)務(wù)需求的基礎(chǔ)上,提高資源調(diào)度分配的效率,實(shí)現(xiàn)對(duì)異構(gòu)網(wǎng)絡(luò)資源優(yōu)化利用。為了有效解決上述問(wèn)題,本學(xué)位論文緊緊圍繞分層異構(gòu)融合網(wǎng)絡(luò)下無(wú)線資源管理主題開(kāi)展工作,側(cè)重研究異構(gòu)網(wǎng)絡(luò)融合系統(tǒng)中的呼損概率模型及其高效算法、呼叫接納控制、多業(yè)務(wù)類型的優(yōu)化資源分配以及垂直切換等無(wú)線資源管理算法,并對(duì)異構(gòu)網(wǎng)絡(luò)融合系統(tǒng)容量進(jìn)行分析,以期達(dá)到有效提高異構(gòu)網(wǎng)絡(luò)融合環(huán)境中無(wú)線通信系統(tǒng)的性能,保證用戶的服務(wù)質(zhì)量,充分利用異構(gòu)網(wǎng)絡(luò)資源的目的。針對(duì)分層異構(gòu)網(wǎng)絡(luò)環(huán)境中,由低層網(wǎng)絡(luò)向高層宏蜂窩網(wǎng)絡(luò)溢出的業(yè)務(wù)流的到達(dá)具有“突發(fā)性”,不適用于傳統(tǒng)的泊松模型的分析方法,以及現(xiàn)有的修正馬爾科夫泊松過(guò)程近似方法具有較高的計(jì)算復(fù)雜度,不適合用來(lái)分析大規(guī)模復(fù)雜網(wǎng)絡(luò)等難題,本文提出了一種分層異構(gòu)網(wǎng)絡(luò)中的多業(yè)務(wù)呼損概率的高效數(shù)值算法,推導(dǎo)出多類型溢出業(yè)務(wù)流的統(tǒng)計(jì)矩;利用等效單位帶寬方式將帶寬資源分配給每個(gè)業(yè)務(wù)流或呼叫連接,并進(jìn)一步根據(jù)上述推導(dǎo)結(jié)果,建立一個(gè)多類型業(yè)務(wù)流呼損模型,求得系統(tǒng)中多類型業(yè)務(wù)流的呼叫阻塞概率的數(shù)值解。通過(guò)比較本文算法與基于多維修正馬爾科夫泊松過(guò)程的近似算法在兩層蜂窩網(wǎng)絡(luò)場(chǎng)景下的仿真結(jié)果,驗(yàn)證了本文算法的高性能和準(zhǔn)確性。針對(duì)分層異構(gòu)網(wǎng)絡(luò)中的呼叫接納控制算法如何控制新的業(yè)務(wù)請(qǐng)求被何種無(wú)線接入網(wǎng)接納,并評(píng)估其對(duì)已有業(yè)務(wù)連接產(chǎn)生的影響,以避免網(wǎng)絡(luò)擁塞和保證業(yè)務(wù)服務(wù)質(zhì)量的問(wèn)題,本文提出一種基于概率機(jī)制的呼叫接納控制算法,能夠根據(jù)無(wú)線局域網(wǎng)的當(dāng)前網(wǎng)絡(luò)負(fù)載情況和用戶終端的移動(dòng)速度等信息,對(duì)來(lái)自蜂窩網(wǎng)的向下垂直切換呼叫的請(qǐng)求進(jìn)行區(qū)分和判決,減少不必要的垂直切換處理負(fù)荷。本文還對(duì)新呼叫阻塞概率和向下垂直切換呼叫阻塞概率進(jìn)行理論分析和推導(dǎo)。仿真結(jié)果表明,該算法能夠減少不必要的頻繁垂直切換,并且限制向下垂直切換呼叫的呼叫阻塞概率在一個(gè)可接受的水平;同時(shí)保證較高的平均系統(tǒng)帶寬利用率,提高了系統(tǒng)性能。針對(duì)未來(lái)的寬帶無(wú)線網(wǎng)絡(luò)中的不同類型業(yè)務(wù)對(duì)時(shí)延的敏感以及帶寬的需求呈現(xiàn)多樣性和動(dòng)態(tài)性,無(wú)線資源分配機(jī)制需要同時(shí)考慮業(yè)務(wù)獲取無(wú)線資源的公平性的問(wèn)題,本文主要研究具有正交頻分復(fù)用接入的異構(gòu)網(wǎng)絡(luò)中的無(wú)線資源分配機(jī)制,力圖在用戶數(shù)據(jù)傳輸速率比例性的公平約束條件下,獲取最大的系統(tǒng)傳輸速率并滿足不同業(yè)務(wù)的服務(wù)質(zhì)量需求。為了解決這些問(wèn)題,我們將系統(tǒng)模型中的業(yè)務(wù)分為兩類:時(shí)延約束型業(yè)務(wù)和盡力而為型業(yè)務(wù);并進(jìn)一步將無(wú)線資源管理問(wèn)題轉(zhuǎn)化為一個(gè)線性規(guī)劃問(wèn)題。我們利用高效迭代算法,將具有指數(shù)級(jí)復(fù)雜度的混合整型規(guī)劃問(wèn)題轉(zhuǎn)換成一個(gè)凸問(wèn)題,求出其優(yōu)化解;或者在其對(duì)偶域進(jìn)行求解。為了評(píng)估本文算法的性能,仿真結(jié)果給出了時(shí)延約束型業(yè)務(wù)的數(shù)據(jù)傳輸速率和盡力而為型業(yè)務(wù)的公平性指數(shù)。與傳統(tǒng)的無(wú)線資源管理機(jī)制相比,它們得到較大的改進(jìn)。此外,本文所提出的優(yōu)化資源分配算法能夠獲得更高更穩(wěn)定的系統(tǒng)吞吐量。針對(duì)分層異構(gòu)網(wǎng)絡(luò)中,多業(yè)務(wù)無(wú)線資源管理如何有效的協(xié)同利用各種無(wú)線資源來(lái)滿足業(yè)務(wù)所需要的服務(wù)質(zhì)量并最小化業(yè)務(wù)成本的問(wèn)題,本文提出了一種基于蜂窩網(wǎng)絡(luò)和無(wú)線局域網(wǎng)的異構(gòu)網(wǎng)絡(luò)的通用無(wú)線資源管理算法。算法的關(guān)鍵參數(shù)包括業(yè)務(wù)類型,用戶終端移動(dòng)性和位置信息等,協(xié)同的利用異構(gòu)網(wǎng)絡(luò)中的資源,并同時(shí)能保證業(yè)務(wù)的服務(wù)質(zhì)量和業(yè)務(wù)成本的最小化。通過(guò)馬爾科夫模型分析了算法的有效性。仿真結(jié)果表明,在不同的移動(dòng)性和網(wǎng)絡(luò)負(fù)荷條件下,本文算法能夠明顯降低不必要的垂直切換到達(dá)率,提供穩(wěn)定的通信,并有效的提高了系統(tǒng)吞吐量,適用于實(shí)際的異構(gòu)網(wǎng)絡(luò)環(huán)境。
[Abstract]:With the rapid development of communication network technology and wireless services, the evolution of wireless access technology and mobile terminal technology is promoted together. Driven by heterogeneous wireless access and multi-mode mobile terminals, the important development trend of future wireless communication systems will be heterogeneous, convergent and cooperative, which will integrate and manage a variety of heterogeneous wireless access networks. Network provides a ubiquitous heterogeneous wireless access environment for multimodal terminals to meet the growing business needs of users in different scenarios. Therefore, wireless resource management is the key technology to achieve orderly organization and efficient utilization of heterogeneous wireless convergence networks. Considering the allocation and use of various wireless resources in the network, we use reconfiguration technology to distribute the services between different access networks through service measurement, and carry out joint access control and resource scheduling for access networks with different characteristics in heterogeneous networks. In order to solve these problems effectively, this dissertation focuses on the research of call loss probability model and its efficient algorithm, call admission control, optimal resource allocation of multi-service types, and so on. In order to improve the performance of wireless communication system in heterogeneous network convergence environment, guarantee the quality of service of users, and make full use of heterogeneous network resources, the capacity of heterogeneous network convergence system is analyzed. The arrival of spilled traffic in cellular networks is "unexpected" and is not suitable for traditional Poisson model analysis methods. The existing modified Markov Poisson process approximation methods have high computational complexity and are not suitable for large-scale complex networks. In this paper, we propose a multi-layer heterogeneous network. The statistical moments of multi-type overflow traffic are deduced by efficient numerical algorithm of traffic call loss probability; bandwidth resources are allocated to each traffic flow or call connection by means of equivalent unit bandwidth. Based on the above deduction results, a call loss model of multi-type traffic flow is established, and call blocking of multi-type traffic flow in the system is obtained. By comparing the simulation results of the proposed algorithm and the approximate algorithm based on multi-maintenance positive Markov Poisson process in two-layer cellular network scenarios, the high performance and accuracy of the proposed algorithm are verified. In order to avoid network congestion and guarantee service quality, a call admission control algorithm based on probabilistic mechanism is proposed, which can be applied to cellular networks according to current network load and mobile speed of user terminals. This paper also analyzes and deduces the new call blocking probability and the downward vertical handoff call blocking probability. Simulation results show that this algorithm can reduce unnecessary frequent vertical handoff and limit downward vertical handoff. The call blocking probability is at an acceptable level, and the system performance is improved by ensuring a high average system bandwidth utilization. In view of the delay sensitivity of different types of services in future broadband wireless networks and the diversity and dynamics of bandwidth requirements, the wireless resource allocation mechanism needs to consider both services. To obtain the fairness of wireless resources, this paper mainly studies the allocation mechanism of wireless resources in heterogeneous networks with orthogonal frequency division multiplexing (OFDM) access, trying to obtain the maximum system transmission rate and satisfy the quality of service requirements of different services under the fairness constraint of user data transmission rate ratio. In this paper, we divide the traffic in the system model into two types: delay-constrained traffic and best-effort traffic, and further transform the radio resource management problem into a linear programming problem. In order to evaluate the performance of the proposed algorithm, the simulation results give the data transmission rate of delay-constrained traffic and the fairness index of the best-effort traffic. To achieve higher and more stable system throughput in hierarchical heterogeneous networks, this paper proposes a generic heterogeneous network based on cellular networks and wireless local area networks (WLAN) to solve the problem of how multi-service wireless resource management can effectively coordinate the use of various wireless resources to meet the service quality and minimize the service cost. The key parameters of the algorithm include service type, user terminal mobility and location information. The algorithm can utilize resources in heterogeneous networks cooperatively and guarantee the service quality and minimize the service cost. The effectiveness of the algorithm is analyzed by Markov model. Simulation results show that the algorithm is effective in different shifts. Under the dynamic and network load conditions, the proposed algorithm can significantly reduce the unnecessary vertical handover arrival rate, provide stable communication, and effectively improve the system throughput, suitable for the actual heterogeneous network environment.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN92

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 王燦如;田輝;苗杰;;基于多目標(biāo)進(jìn)化的終端聚合選擇算法研究[J];電子與信息學(xué)報(bào);2011年10期

2 鄧強(qiáng);陳山枝;胡博;時(shí)巖;;異構(gòu)無(wú)線網(wǎng)絡(luò)中基于馬爾可夫決策過(guò)程的區(qū)分業(yè)務(wù)接納控制的研究[J];通信學(xué)報(bào);2010年12期

3 王亞楠;夏海輪;馮春燕;;異構(gòu)網(wǎng)絡(luò)中多媒體業(yè)務(wù)的聯(lián)合呼叫接納控制[J];西安電子科技大學(xué)學(xué)報(bào);2010年05期

4 高雨;曾華q，

本文編號(hào)：2176919