高动态高空平台网络接入与切换技术研究及仿真

发布时间：2018-01-12 12:21

本文关键词：高动态高空平台网络接入与切换技术研究及仿真　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,凭借高空平台特殊的战略位置,高空平台网络的军事战略价值受到人们越来越多的重视,各国纷纷投入大量经费和人力对其展开深入研究。将高空平台引入陆、海、空、天一体化信息网络,在建设我国空天海洋能力新拓展体系中将起到重要作用。对于我国来说,加强对高空平台及其网络的研究,既是机遇,更是挑战。由于高空平台所处环境的特殊性,对高空平台网络的关键技术提出了新的挑战。首先,本文设计了一个合理的高动态高空平台网络模型。在此基础上,展开了对高动态高空平台网络接入技术和切换技术的深入研究:1)对于高动态高空平台网络接入技术,本文提出了一种基于业务优先级的按需分配动态TDMA协议。该接入协议在沿用固定TDMA时隙概念的基础上,采用了为请求接入的移动终端业务按需分配时隙资源来避免时隙资源的浪费,从而提高了整个网络的性能。为给高空平台网络接入终端的不同类型业务提供优先级支持,该协议在接入请求阶段为终端高优先级业务的接入请求预留了相应的时隙;同时为低优先级业务的接入请求仅提供了一个竞争时隙,达到了优先保证高优先级业务QoS的目的。另外,该接入协议通过动态调整guard time的长度,提高了动态TDMA时隙的利用率。2)对于高动态高空平台网络切换技术,针对接入终端高动态性造成的切换触发滞后性,本文提出了一个基于动态滞后余量的切换触发准则,在切换触发时对接入终端的接收信号强度和移动速度进行综合考虑。针对多个接入终端的并发切换易导致网络负载失衡的问题,本文提出了一个基于接收信号强度和能量感知的负载均衡切换准则,在选取目标高空平台时对高空平台的剩余能量和接入终端的接收信号强度进行了综合考虑。最后,在OPNET平台上,对所提出的接入技术和切换技术分别进行了仿真。通过与传统的接入技术和切换技术的仿真结果进行对比,验证了所改进的接入技术和切换技术可以更好地满足高动态高空平台网络的需求。本文的研究成果为我国在空天网络和临近空间的技术研究提供了理论性的指导,具有一定的参考价值。
[Abstract]:In recent years, with the special strategic position of high-altitude platform, the military strategic value of high-altitude platform network has been paid more and more attention. Countries have invested a lot of funds and manpower to carry out in-depth research. The high-altitude platform will be introduced into the land, sea, air, and space integrated information network. It will play an important role in building a new expanding system of air and sky ocean capability in our country. For our country, it is an opportunity to strengthen the research on high altitude platform and its network. Because of the particularity of the environment of the high-altitude platform, it puts forward a new challenge to the key technology of the high-altitude platform network. First of all. A reasonable network model of high dynamic high altitude platform is designed in this paper. The research on high dynamic high-altitude platform network access technology and handoff technology is carried out. (1) for high-dynamic high-altitude platform network access technology. In this paper, a dynamic TDMA protocol based on service priority is proposed, which is based on the concept of fixed TDMA slot. The time slot resources are allocated according to the needs of the mobile terminal services requesting access to avoid the waste of the time slot resources. It improves the performance of the whole network and provides priority support for different types of services of the high-altitude platform network access terminal. The protocol reserves time slots for access requests of high-priority services in the access request stage. At the same time, it only provides a competitive time slot for the access request of low-priority services, which achieves the purpose of first guaranteeing the QoS of high-priority services. By dynamically adjusting the length of guard time, the access protocol improves the utilization ratio of dynamic TDMA slot. 2) for high-dynamic high-altitude platform network switching technology. Aiming at the delay of handoff trigger caused by high dynamic state of access terminal, a handoff trigger criterion based on dynamic lag margin is proposed in this paper. The received signal strength and the moving speed of the access terminal are considered synthetically when the switch is triggered. The concurrent handover of multiple access terminals may lead to the problem of network load imbalance. In this paper, a load balancing switching criterion based on received signal strength and energy sensing is proposed. The residual energy of the high-altitude platform and the received signal intensity of the access terminal are considered comprehensively when selecting the target high-altitude platform. Finally, on the OPNET platform. The proposed access technology and handover technology are simulated, and compared with the simulation results of the traditional access technology and handover technology. It is verified that the improved access technology and handoff technology can better meet the needs of high-dynamic high-altitude platform network. The research results in this paper provide theoretical guidance for the research of space-space network and adjacent space technology in China. . It has certain reference value.
【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】：TN915.6

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