下一代超高速无线局域网接纳控制技术研究和仿真系统设计

发布时间：2018-05-18 03:14

本文选题：接纳控制 + 资源分配　；参考：《电子科技大学》2014年硕士论文

【摘要】：无线局域网已经成为无线宽带通信的重要组成部分,无线局域网技术可以显著的增加接入带宽,并且减少布网成本,同时提高接入的灵活性。无线局域网技术能使用户通过无线实现高速率、低资费的上网,已经显示出了强大的生命力和应用前景,成为了最具商业前景的通信技术之一。在下一代超高速无线局域网中,不同带宽接入能力的终端,不同QoS需求的业务并存,使得接纳控制问题显得尤为突出,通过合适的接纳控制算法可以限制呼叫的接入和动态的分配带宽来实现高的信道利用率和减少系统的整体阻塞概率和掉线率。本文依托于国家高技术发展计划(863)重大专项——超高速无线局域网无线接口关键技术研究与验证,实现了NUHT系统的大部分协议,包括业务流的连接管理,资源分配,带宽申请,ARQ,MAC服务数据单元的分片和聚合等功能,并且完善了Pipeline机制对于无线通信信道的性能仿真。本文针对下一代超高速无线局域网多带宽接入能力、多业务并发执行的场景,提出了以提高信道利用率为目标,兼顾切换业务,QoS优先级因素下,尽可能实现同类业务公平性的接纳控制算法FDBR(Fairly dynamic bandwidth release),并对该算法进行了理论上的分析,在下一代超高速无线局域网的仿真平台上进行了仿真,并进行了性能对比。承接接纳控制算法,对接纳控制后的资源进行细分配,基于信道利用率的最优化算法,提出了一种二级分配机制,先以用户为粒度对按用户优先级进行了一级分配,再对用户得到的资源按业务流进行再分配,最后统一分配BE业务。最后基于OPNET的仿真平台下进行系统级的仿真,并同现有算法进行了对比,验证针对现有环境下,所提出的接纳算法在业务量不断增加的情形下,新业务的阻塞概率和切换业务丢失概率的比现有的一些接纳控制算法有比较明显的下降,资源分配算法在随着80M用户的比例的增多,信道的利用率趋于增高。
[Abstract]:Wireless local area network (WLAN) has become an important part of wireless broadband communication. WLAN technology can significantly increase access bandwidth, reduce the cost of network distribution, and improve access flexibility. Wireless local area network (WLAN) technology enables users to access the Internet with high speed and low tariff through wireless, which has shown strong vitality and application prospect, and has become one of the most promising communication technologies. In the next generation ultra-high speed wireless local area network, different bandwidth access capabilities of terminals and different QoS requirements coexist, which makes the admission control problem particularly prominent. Access to calls and dynamic bandwidth allocation can be restricted by appropriate admission control algorithms to achieve high channel utilization and reduce the overall blocking probability and drop rate of the system. Based on the research and verification of the key technology of ultra-high speed wireless local area network (WLAN), which is a major project of the National High Technology Development Program (863), this paper realizes most of the protocols of the NUHT system, including connection management of traffic flow, resource allocation, etc. The partition and aggregation functions of ARQO MAC service data unit are presented, and the performance simulation of wireless communication channel based on Pipeline mechanism is improved. Aiming at the scenario of multi-bandwidth access and concurrent execution of multi-service in the next generation ultra-high speed wireless local area network, this paper proposes a new method to improve channel utilization and to take into account the QoS priority factor of handoff services. The admission control algorithm (FDBR(Fairly dynamic bandwidth release), which realizes the fairness of similar services as much as possible, is analyzed theoretically and simulated on the next generation ultra-high speed WLAN simulation platform, and the performance is compared. Taking the admission control algorithm, the resources after admission control are subdivided and allocated. Based on the optimal channel utilization algorithm, a two-level allocation mechanism is proposed. First, the user granularity is used to allocate the resources according to the priority of the user. The resources obtained by the user are redistributed according to the service flow, and finally the be services are uniformly allocated. Finally, the system-level simulation based on OPNET is carried out, and compared with the existing algorithms, it is verified that the proposed admission algorithm is in the case of increasing traffic under the existing environment. The blocking probability and handoff loss probability of the new traffic are significantly lower than those of some existing admission control algorithms. With the increase of the proportion of 80m users, the channel utilization rate tends to increase.
【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】：TN925.93

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