面向低轨卫星的多业务接入控制关键技术研究

发布时间：2018-11-20 12:06

【摘要】：随着LEO卫星通信的全面发展,无线资源管理在全球通信中的作用也越来越突出,而接入控制技术作为无线资源管理的一个重要方面直接影响着卫星通信的质量、用户的满意度。因此,设计合理的接入控制策略成为了当前研究的热点。本文考虑低轨卫星切换频繁、星上资源稀缺的特点,针对越来越庞大的用户群体、越来越丰富的业务种类,研究面向低轨卫星的多业务接入控制技术。用户对服务质量要求不断提高的同时,也逐渐关注资源使用的公平性,因而新的接入控制技术需要提高信道利用率的同时提高用户满意度,兼顾资源使用的公平性。首先,通过文献调研,归纳总结了现有的解决卫星接入控制方面的策略,分析现有策略在LEO系统中应用的不足。其次,针对低轨卫星中的不同用户、不同业务,进行优先级划分,通过升降级操作来提高高优先级用户以及高优先级业务的接入概率,仿真结果表明,该策略提高了用户接入概率和信道利用率。最后,为了兼顾在不同信道负载条件下,不同用户、不同业务之间信道资源使用的公平性,以用户整体满意度为标准,采用效用函数构造博弈模型,采用信道与用户进行博弈的方式决定是否对信道中的用户进行降级操作以及降级的带宽大小。仿真结果表明,提出的基于博弈论的接入控制策略能够较好地保证高优先级用户的接入概率,提高用户整体满意度。
[Abstract]:With the overall development of LEO satellite communications, the role of wireless resource management in global communications is becoming more and more prominent. As an important aspect of wireless resource management, access control technology directly affects the quality of satellite communications and user satisfaction. Therefore, the design of reasonable access control strategy has become the focus of current research. Considering the frequent switching of Leo satellites and the scarcity of on-board resources, the multi-service access control technology for Leo satellites is studied in this paper, aiming at more and more large user groups and more kinds of services. At the same time, users pay more and more attention to the fairness of resource use. Therefore, the new access control technology needs to improve the channel utilization and user satisfaction, and give consideration to the fairness of resource use. First of all, through the literature investigation, summarized the existing strategy to solve the satellite access control, and analyzed the shortcomings of the existing strategy in LEO system. Secondly, according to different users and different services in Leo satellite, priority division is carried out, and the access probability of high-priority users and high-priority services is improved by up-level operation. The simulation results show that, This strategy improves the user access probability and channel utilization. Finally, in order to take into account the fairness of channel resource use between different users and different services under different channel load conditions, the utility function is used to construct a game model based on the overall user satisfaction. The channel and user game are used to decide whether to demote the user in the channel and the bandwidth of the degradation. Simulation results show that the proposed access control strategy based on game theory can guarantee the access probability of high priority users and improve the overall satisfaction of users.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

【相似文献】