【摘要】：隨著無(wú)線通信技術(shù)發(fā)展,人們對(duì)業(yè)務(wù)多樣化和帶寬不斷增長(zhǎng)的需求,單一的網(wǎng)絡(luò)提供的單一的服務(wù)將不再具有競(jìng)爭(zhēng)性,對(duì)有限的無(wú)線資源環(huán)境的有效利用越來(lái)越迫切,促使無(wú)線通信從一組孤立的網(wǎng)絡(luò)向具有競(jìng)爭(zhēng)力技術(shù)的異構(gòu)融合無(wú)線網(wǎng)絡(luò)發(fā)展。與此同時(shí),不同的無(wú)線接入技術(shù)(RAT)在同一區(qū)域覆蓋重疊,導(dǎo)致同一區(qū)域存在多個(gè)接入接口,使具有多模接入能力的終端和RAT面臨接入選擇的問(wèn)題。因此無(wú)線資源管理(RRM)成為異構(gòu)無(wú)線網(wǎng)絡(luò)亟待解決的問(wèn)題。接納控制是RRM最重要的技術(shù),可以制定合適的接入選擇算法,在網(wǎng)絡(luò)端與用戶端達(dá)到?jīng)Q策目的,優(yōu)化網(wǎng)絡(luò)資源分配,實(shí)現(xiàn)業(yè)務(wù)QoS保障。但是RRM策略的實(shí)施要求合適的異構(gòu)無(wú)線網(wǎng)絡(luò)平臺(tái),以及RRM實(shí)施的具體方式。本文通過(guò)對(duì)現(xiàn)有異構(gòu)RRM和接納控制的研究,提出了基于Wi MAX與WLAN異構(gòu)融合的動(dòng)態(tài)分級(jí)聯(lián)合無(wú)線資源管理體系(DHJRRM)和考慮用戶優(yōu)先級(jí)的接入選擇算法以及切換算法,通過(guò)終端與網(wǎng)絡(luò)端的接納控制均衡不同RAT間負(fù)載,提升系統(tǒng)吞吐量。第一,搭建了WiMAX與WLAN構(gòu)成的異構(gòu)無(wú)線網(wǎng)絡(luò)系統(tǒng)平臺(tái),將RRM體系中LRRM、RRM、JRRM管理模塊與RAT的網(wǎng)元(即接入點(diǎn)、網(wǎng)關(guān)、核心網(wǎng))相映射,提出了DHJRRM架構(gòu)的異構(gòu)無(wú)線網(wǎng)絡(luò)資源管理模型和資源交互流程,給出了屬于不同RRM層次資源模塊間信息交互流程。第二,分析了當(dāng)前常用的接納控制策略,給出了考慮用戶偏好、用戶優(yōu)先級(jí)通過(guò)終端與網(wǎng)絡(luò)端綜合決策的接入選擇流程。為使終端能以最大初始接入概率接入網(wǎng)絡(luò),提出了基于最大初始接入的加權(quán)選擇算法(MIAWC)。第三,當(dāng)終端初始請(qǐng)求未成功或者已接入網(wǎng)絡(luò)中需要切換時(shí),分別提出了基于這兩種情況的網(wǎng)絡(luò)再選擇算法。初始請(qǐng)求未成功時(shí),綜合考慮網(wǎng)絡(luò)性能、負(fù)載等因素,實(shí)時(shí)獲取各個(gè)RAT的網(wǎng)絡(luò)性能參數(shù),提出基于AHP與GRA的接入再選擇算法(AHPGRA-AAS),采用AHP與GRA聯(lián)合分析;當(dāng)網(wǎng)絡(luò)過(guò)載觸發(fā)切換流程,計(jì)算不同業(yè)務(wù)的切換優(yōu)先序列,以此選擇合適的業(yè)務(wù)實(shí)施切換,實(shí)現(xiàn)不同RAT間負(fù)載均衡,提出基于業(yè)務(wù)重要性的指數(shù)加權(quán)切換算法(TIEW)。最后,在構(gòu)建的異構(gòu)網(wǎng)絡(luò)體系內(nèi),使用OPNET仿真平臺(tái)對(duì)提出的架構(gòu)和算法進(jìn)行實(shí)現(xiàn)。仿真表明,提出的算法能較好的保證高優(yōu)先級(jí)用戶的傳輸,實(shí)現(xiàn)不同RAT間負(fù)載均衡,提升系統(tǒng)性能。
[Abstract]:With the development of wireless communication technology and the increasing demand for service diversification and bandwidth, a single service provided by a single network will no longer be competitive, and the effective use of a limited wireless resource environment is becoming more and more urgent. Promote the development of wireless communication from a set of isolated networks to heterogeneous converged wireless networks with competitive technologies. At the same time, different wireless access technology (RAT) overlaps in the same area, which leads to multiple access interfaces in the same area, which makes the terminal with multi-mode access ability and RAT face the problem of access selection. Therefore, wireless resource management (RRM) has become an urgent problem to be solved in heterogeneous wireless networks. Admission control is the most important technology of RRM. It can make appropriate access selection algorithm, achieve the decision-making purpose at the network end and the client end, optimize the network resource allocation, and realize the service QoS guarantee. However, the implementation of RRM strategy requires a suitable heterogeneous wireless network platform, as well as the specific implementation of RRM. Based on the research of existing heterogeneous RRM and admission control, this paper proposes a dynamic hierarchical joint wireless resource management architecture (DHJRRM) based on heterogeneous integration of Wi MAX and WLAN, an access selection algorithm considering user priority and a handoff algorithm. The throughput of the system can be improved by balancing the load between different RAT through the admission control between the terminal and the network. First, the heterogeneous wireless network system platform composed of WiMAX and WLAN is built, and the LRRM,RRM,JRRM management module of RRM system is mapped with the network element of RAT (i.e. access point, gateway, core network). In this paper, the resource management model and resource interaction flow of heterogeneous wireless network based on DHJRRM architecture are proposed, and the flow chart of information interaction between resource modules belonging to different RRM levels is given. Secondly, the commonly used admission control strategy is analyzed, and the access selection process is given, which considers the user preference and user priority through the integrated decision-making between the terminal and the network end. In order to enable the terminal to access the network with the maximum initial access probability, a weighted selection algorithm (MIAWC). Based on the maximum initial access is proposed. Thirdly, when the initial request of the terminal is not successful or the handoff is needed in the connected network, the network re-selection algorithm based on these two cases is proposed respectively. When the initial request is not successful, considering the network performance, load and other factors, the real-time network performance parameters of each RAT are obtained, and an access re-selection algorithm (AHPGRA-AAS) based on AHP and GRA is proposed, which is analyzed jointly by AHP and GRA. When the network overload triggers the handoff process, calculates the switching priority sequence of different services, and then selects the appropriate service to implement the handoff, and realizes the load balancing among different RAT. An exponential weighted handoff algorithm (TIEW). Based on service importance is proposed. Finally, OPNET simulation platform is used to implement the proposed architecture and algorithm in the heterogeneous network architecture. Simulation results show that the proposed algorithm can ensure the transmission of high-priority users, achieve load balancing among different RAT, and improve the performance of the system.
【學(xué)位授予單位】：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)】：TN915.07

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本文編號(hào)：2447354