基于DVB-RCS的宽带卫星通信系统资源分配技术研究

发布时间：2018-04-01 01:01

本文选题：卫星通信　切入点：DVB-RCS　出处：《西安电子科技大学》2014年硕士论文

【摘要】：随着全球网络化、信息化的不断发展,地面通信网络已经不能满足人们日益增长的通信需求,通过卫星通信系统向固定和移动用户提供多媒体宽带服务已经成为一种重要的技术选择。为了使用户的资源请求得到最大限度的满足,同时优化带宽利用率和网络的服务质量,迫切需要采用高效的无线资源管理(RRM)技术。无线资源管理的关键技术主要包括：呼叫接入控制算法、带宽分配算法以及时隙位置分配算法等。本文提出了基于DVB-RCS协议下的宽带卫星通信系统方案,重点研究了适合本系统方案的呼叫接入控制算法以及带宽分配算法。本文的主要工作如下：1、给出了基于DVB-RCS的宽带卫星通信系统方案,该方案上行采用MF-TDMA的接入方式,下行采用CWTDM连续波时分复用的方法。对DVB-RCS协议进行了相关介绍,给出了基于DVB-RCS的宽带卫星通信系统资源管理体系。2、在综合考虑卫星通信系统网络中不同类型的业务情况下,提出了适用于宽带卫星通信系统的基于网络效益最大同时保证QoS的CAC策略。相比于BNP算法,本文算法具有更高的系统资源利用率,在系统负载饱和的情况下可以达到95%,并在一定程度上降低了呼叫请求拒绝率。3、针对传统的QoS带宽分配算法未考虑物理层信道条件而导致系统吞吐量不高,以及现有的基于效用函数的跨层带宽分配算法系统公平性下降的问题,提出了一种跨层效用公平算法。该算法利用跨层设计的思想,联合MAC层、应用层的QoS参数和物理层的信道状态条件构造效用函数,将问题转化为求解非线性整数规划问题。仿真结果表明,跨层效用公平算法在公平性仅下降0.006的前提下,可以使得系统的吞吐量增加21个MPEG-TS包。从而在保证用户公平性的前提下,最大化系统的吞吐量,实现了系统公平性和资源利用率的折中。
[Abstract]:With the continuous development of the global network and information technology, the terrestrial communication network can no longer meet the increasing communication needs of people. Providing multimedia broadband services to fixed and mobile users through satellite communication systems has become an important technology choice. It is urgent to adopt efficient RRM technology. The key technologies of RRM mainly include: call access control algorithm. Bandwidth allocation algorithm and slot location allocation algorithm etc. In this paper, a broadband satellite communication system based on DVB-RCS protocol is proposed. This paper focuses on the call access control algorithm and bandwidth allocation algorithm suitable for this system. The main work of this paper is as follows: 1. A broadband satellite communication system scheme based on DVB-RCS is presented. The scheme adopts MF-TDMA access mode in uplink. In this paper, the CWTDM continuous wave time division multiplexing method is used in the downlink. The DVB-RCS protocol is introduced, and the resource management system of broadband satellite communication system based on DVB-RCS. 2. Considering the different types of services in the satellite communication system network synthetically, A CAC strategy based on maximum network efficiency and guaranteed QoS is proposed for broadband satellite communication systems. Compared with the BNP algorithm, the proposed algorithm has a higher system resource utilization ratio. When the system load is saturated, it can reach 95%, and reduce the call rejection rate to a certain extent. The traditional QoS bandwidth allocation algorithm does not consider the physical layer channel condition, so the system throughput is not high. And the problem that the fairness of the existing cross-layer bandwidth allocation algorithm based on utility function is reduced, a cross-layer utility fairness algorithm is proposed, which combines the MAC layer with the idea of cross-layer design. The utility function is constructed by using the QoS parameters of the layer and the channel state condition of the physical layer, and the problem is transformed into a nonlinear integer programming problem. The simulation results show that the cross-layer utility fairness algorithm is only reduced by 0.006 in fairness. The throughput of the system can be increased by 21 MPEG-TS packets, thus maximizing the throughput of the system under the premise of ensuring the fairness of the user, and realizing the compromise between the fairness of the system and the utilization of resources.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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