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Performance evaluation of multimedia satellite communications systems using on-board packet switches.

机译：使用机载分组交换机的多媒体卫星通信系统的性能评估。

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摘要

Satellite communications systems are ideally equipped to provide future multimedia services on a global level and at a distance-independent cost. In order to meet the ever-growing bandwidth demands of these new applications, satellites employing multiple spot beam antennas are required. An on-board packet switch is an essential element in such a system as it offers full connectivity among users and offers efficient utilization of the space segment. This thesis evaluates the performance of a satellite-switched system in a multimedia environment mainly composed of voice, video, and data sources. Aggregate voice or video traffic is modeled as a 2-state Markov Modulated Poisson Process (MMPP) while two models for aggregate data traffic, MMPP and Pareto Modulated Poisson Process (PMPP) are used to examine the effects of traffic burstiness and long-range dependent behaviour. Multiple Frequency Time Division Multiple Access (MF-TDMA) is utilized on the uplink in conjunction with a dynamic capacity allocation scheme. Higher priority is given to voice and video real-time traffic to avoid delay variation. On-board downlink queue is provided for data jitter-tolerant traffic to achieve high statistical multiplexing gain.;Simulation results show that the system can support traffic predominantly composed of real-time applications. As jitter-tolerant data becomes the dominant traffic component and becomes highly correlated, the size of the uplink and downlink queues need to be increased to maintain an acceptable quality-of-service (QoS). The packet loss due to the Knockout contention scheme is much lower than that due to the limited capacity on the uplink and downlink. This makes the Knockout switch fabric attractive for on-board switching since it achieves low complexity. The need for a congestion control scheme that can shape the traffic is required, especially when the traffic has long-range dependent behaviour.
机译：理想地配备了卫星通信系统，可以在全球范围内以与距离无关的成本提供未来的多媒体服务。为了满足这些新应用不断增长的带宽需求，需要采用多个点波束天线的卫星。板载分组交换机是这种系统中的基本元素，因为它可以在用户之间提供完全的连接并有效利用空间段。本文评估了卫星交换系统在主要由语音，视频和数据源组成的多媒体环境中的性能。语音或视频总流量建模为2状态马尔可夫调制泊松过程（MMPP），而聚合数据流量的两种模型MMPP和帕累托调制泊松过程（PMPP）用于检查流量突发性和与远程相关的影响行为。结合动态容量分配方案，在上行链路上利用了多频时分多址（MF-TDMA）。语音和视频实时流量具有更高的优先级，以避免延迟变化。为容忍数据抖动的业务提供了机载下行队列，以实现较高的统计复用增益。仿真结果表明，该系统可以支持主要由实时应用组成的业务。随着容忍抖动的数据成为主要的流量组件并变得高度相关，需要增加上行链路和下行链路队列的大小，以维持可接受的服务质量（QoS）。由于淘汰争用方案而导致的数据包丢失要比由于上行链路和下行链路上的有限容量而导致的数据包丢失要低得多。这使得Knockout交换结构具有较低的复杂度，因此对板载交换很有吸引力。需要一种可以调整流量的拥塞控制方案，尤其是在流量具有长期依赖行为的情况下。

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  • 作者

    Bui, Tien Hy.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.A.Sc.
  • 年度 1998
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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