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Future mobile satellite systems: Issues in timing synchronisation and resource allocation techniques.

机译：未来的移动卫星系统：定时同步和资源分配技术方面的问题。

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摘要

In an era where the personal communication character of the user is the main technology focus, the convergence of mobile satellite and mobile terrestrial systems seems not too distant. The extend of the integration of the satellite-based and the terrestrial-based systems introduces major architectural challenges. The first chapter of this thesis presents a general overview of the mobile satellite systems, presents the organisation of the thesis and details the main contributions. In the second chapter some background information relevant to the research is presented. Specifically, aspects of GSM and GPRS are presented. Additionally, after a brief description of S-PCSs, the subject of satellite and GSM integration is addressed. In the third chapter issues regarding timing synchronisation, when GSM is integrated with a satellite system, are examined, and solutions to mitigate parts of the problems identified are proposed. In the fourth chapter the GPRS system is examined in the satellite environment. The research is focused in the GPRSs RLC/MAC protocol, which is mainly responsible for the allocation of resources amongst the users. Dynamic Channel Allocation (DCA) techniques, are expected to improve dramatically the efficiency of the resources allocation issue, by allowing a more intelligent use of the limited spectrum available for mobile communications. In the fifth chapter, novel DCA algorithms are introduced and are examined for purposes of resources allocation for mobile satellite systems. In the sixth chapter heuristic algorithms are used in combination with the proposed DCA schemes in order to offer a further optimisation in the systems examined. Simulated annealing, is incorporated to the real-time system scenarios, in contrast to its conventional use for non-dynamic systems and major benefits to the systems are introduced. The final chapter brings the thesis to a conclusion by summarising the main results and proposing areas where further work may be fruitful.
机译：在以用户的个人通信特性为主要技术焦点的时代，移动卫星和地面移动系统的融合似乎不太遥远。卫星和地面系统集成的扩展带来了重大的架构挑战。本文的第一章对移动卫星系统进行了概述，介绍了论文的组织结构并详述了主要贡献。在第二章中，介绍了与研究有关的一些背景信息。具体而言，介绍了GSM和GPRS的各个方面。另外，在简要描述了S-PCS之后，将讨论卫星和GSM集成的主题。在第三章中，研究了将GSM与卫星系统集成在一起时有关定时同步的问题，并提出了缓解部分问题的解决方案。在第四章中，在卫星环境中研究了GPRS系统。研究集中在GPRS RLC / MAC协议上，该协议主要负责用户之间的资源分配。通过允许更智能地使用可用于移动通信的有限频谱，动态信道分配（DCA）技术有望大大提高资源分配问题的效率。在第五章中，介绍了新颖的DCA算法，并对其进行了研究，以用于移动卫星系统的资源分配。在第六章中，启发式算法与提出的DCA方案结合使用，以便在所检查的系统中提供进一步的优化。与非动态系统的常规用法相反，将模拟退火合并到了实时系统方案中，并介绍了该系统的主要优点。最后一章通过总结主要结果并提出可能需要进一步开展工作的领域来对论文进行总结。

著录项

  • 作者

    Koutsaftiki, Aikaterini.;

  • 作者单位

    University of London, University College London (United Kingdom).;

  • 授予单位 University of London, University College London (United Kingdom).;
  • 学科 Electrical engineering.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 195 p.
  • 总页数 195
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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