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Improving the real-time performance of a wireless local area network.

机译：改善无线局域网的实时性能。

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摘要

This research considers the transmission of real-time data within a wireless local area network (WLAN).; Exact and approximate analytic network evaluation techniques are examined. The suitability of using a given technique in a particular situation is discussed.; Simulation models are developed to study the performance of our protocol RT-MAC (real-time medium access control). RT-MAC is a novel, simple, and elegant MAC protocol for use in transmitting real-time data in point to point ad hoc WLAN. Our enhancement of IEEE 802.11, RT- MAC, achieves dramatic reductions in mean delay, missed deadlines, and packet collisions by selectively discarding packets and sharing station state information. For example, in a 50 station network with a normalized offered load of 0.7, mean delay is reduced from more than 14 seconds to less than 45 ms, late packets are reduced from 76% to less than 1%, and packet collisions are reduced from 36% to less than 1%. Stations using RT-MAC are interoperable with stations using IEEE 802.11. In networks with both RT-MAC and IEEE 802.11 stations, significant performance improvements were seen even when more than half of the stations in the network were not RT-MAC stations.; The effect of the wireless channel and its impact on the ability of a WLAN to meet packet deadlines is evaluated. It is found that, in some cases, other factors such as the number of stations in the network and the offered load are more significant than the condition of the wireless channel.; Regression models are developed from simulation data to predict network behavior in terms of throughput, mean delay, missed deadline ratio, and collision ratio. Telemetry, avionics, and packetized voice traffic models are considered.; The applicability of this research is not limited to real-time wireless networks. Indeed, the collision reduction algorithm of RT-MAC is independent of the data being transported. Furthermore, RT-MAC would perform equally well in wired networks. Incorporating the results of this research into existing protocols will result in immediate and dramatic improvements in network performance.
机译：这项研究考虑了无线局域网（WLAN）中的实时数据传输。研究了精确和近似的分析网络评估技术。讨论了在特定情况下使用给定技术的适用性。开发仿真模型来研究我们协议RT-MAC（实时媒体访问控制）的性能。 RT-MAC是一种新颖，简单且精巧的MAC协议，可用于在点对点 ad hoc WLAN中传输实时数据。我们对IEEE 802.11 RT-MAC的增强，通过有选择地丢弃数据包和共享站状态信息，显着减少了平均延迟，错过的最后期限以及数据包冲突。例如，在标准负载为0.7的50站网络中，平均延迟从大于14秒减少到小于45 ms，延迟数据包从76％减少到小于1％，数据包冲突从36％至少于1％。使用RT-MAC的站点可以与使用IEEE 802.11的站点互操作。在同时具有RT-MAC和IEEE 802.11站的网络中，即使网络中超过一半的站不是RT-MAC站，也可以看到显着的性能改进。评估了无线信道的影响及其对WLAN满足数据包期限的能力的影响。发现在某些情况下，其他因素（例如网络中的站点数和提供的负载）比无线信道的条件更为重要。从仿真数据中开发出回归模型，以根据吞吐量，平均延迟，错过的截止期限比率和冲突比率来预测网络行为。考虑遥测，航空电子和分组语音业务模型。这项研究的适用性不限于实时无线网络。实际上，RT-MAC的冲突减少算法与正在传输的数据无关。此外，RT-MAC在有线网络中的性能同样出色。将这项研究的结果整合到现有协议中，将导致网络性能的迅速显着改善。

著录项

  • 作者

    Baldwin, Rusty Olen.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 329 p.
  • 总页数 329
  • 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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