异构无线网络资源管理与联合接纳控制研究
发布时间：2019-03-25 21:52
【摘要】：随着无线通信技术发展,人们对业务多样化和带宽不断增长的需求,单一的网络提供的单一的服务将不再具有竞争性,对有限的无线资源环境的有效利用越来越迫切,促使无线通信从一组孤立的网络向具有竞争力技术的异构融合无线网络发展。与此同时,不同的无线接入技术(RAT)在同一区域覆盖重叠,导致同一区域存在多个接入接口,使具有多模接入能力的终端和RAT面临接入选择的问题。因此无线资源管理(RRM)成为异构无线网络亟待解决的问题。接纳控制是RRM最重要的技术,可以制定合适的接入选择算法,在网络端与用户端达到决策目的,优化网络资源分配,实现业务QoS保障。但是RRM策略的实施要求合适的异构无线网络平台,以及RRM实施的具体方式。本文通过对现有异构RRM和接纳控制的研究,提出了基于Wi MAX与WLAN异构融合的动态分级联合无线资源管理体系(DHJRRM)和考虑用户优先级的接入选择算法以及切换算法,通过终端与网络端的接纳控制均衡不同RAT间负载,提升系统吞吐量。第一,搭建了WiMAX与WLAN构成的异构无线网络系统平台,将RRM体系中LRRM、RRM、JRRM管理模块与RAT的网元(即接入点、网关、核心网)相映射,提出了DHJRRM架构的异构无线网络资源管理模型和资源交互流程,给出了属于不同RRM层次资源模块间信息交互流程。第二,分析了当前常用的接纳控制策略,给出了考虑用户偏好、用户优先级通过终端与网络端综合决策的接入选择流程。为使终端能以最大初始接入概率接入网络,提出了基于最大初始接入的加权选择算法(MIAWC)。第三,当终端初始请求未成功或者已接入网络中需要切换时,分别提出了基于这两种情况的网络再选择算法。初始请求未成功时,综合考虑网络性能、负载等因素,实时获取各个RAT的网络性能参数,提出基于AHP与GRA的接入再选择算法(AHPGRA-AAS),采用AHP与GRA联合分析;当网络过载触发切换流程,计算不同业务的切换优先序列,以此选择合适的业务实施切换,实现不同RAT间负载均衡,提出基于业务重要性的指数加权切换算法(TIEW)。最后,在构建的异构网络体系内,使用OPNET仿真平台对提出的架构和算法进行实现。仿真表明,提出的算法能较好的保证高优先级用户的传输,实现不同RAT间负载均衡,提升系统性能。
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.07
本文编号：2447354
[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.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.07
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