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Single-hop and multi-hop ad hoc networks: Performance analysis and a new MAC protocol.

机译：单跳和多跳自组织网络：性能分析和新的MAC协议。

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摘要

The major contributions of this dissertation are in two distinct areas of ad hoc networks, namely; an analytical model for the Medium Access Control (MAC) layer of single-hop and multi-hop ad hoc networks, and a new MAC layer design strategy to reduce network latency.; Firstly, an analytical model is presented for analyzing the MAC layer performance of single-hop and multi-hop ad hoc networks. In this dissertation, the IEEE 802.11 DCF protocol is selected as an example, but the analytical approach is applicable to many MAC schemes for ad hoc networks. To start with, an analytical model is presented for capturing attributes of a node operating based on the IEEE 802.11 Distributed Coordination Function (DCF) MAC protocol. The node model is then used to carry out a throughput and delay analysis of single-hop ad hoc networks in which different nodes may have different traffic loads. The inherent complexity of analysis of a multi-hop ad hoc network together with the fact that the behavior of a node is dependent not only on its neighbors' behavior, but also on the behavior of other unseen nodes makes multi-hop analysis extremely difficult. However, the approach in this dissertation to analyze multi-hop networks offers a very accurate approximation for these complex networks.; Secondly, a new transmission strategy is proposed for multi-hop ad hoc network MAC protocols that improves network latency, which is a fundamental QoS measure. The new MAC protocol is called Multi-Power MAC (MP-MAC), and its performance analysis is presented by extending the proposed MAC layer analytical model to the new protocol. The latency reduction factor is more than two under low and moderate load conditions, and close to one for high offered loads. The protocol achieves this by introducing a multi-power option and selecting the transmit power from the set of options adaptively so that the average number of hops per packet is reduced, without affecting network throughput. This new idea can be applied to any ad hoc access method, but since 802.11 DCF MAC is the most studied wireless LAN protocol, it has been chosen to demonstrate the effects of the new protocol.
机译：本论文的主要贡献在于ad hoc网络的两个不同领域：单跳和多跳自组织网络的媒体访问控制（MAC）层的分析模型，以及减少网络等待时间的新MAC层设计策略。首先，提出了一种分析模型，用于分析单跳和多跳自组织网络的MAC层性能。本文以IEEE 802.11 DCF协议为例，但该分析方法适用于自组织网络的许多MAC方案。首先，提出了一种分析模型，用于捕获基于IEEE 802.11分布式协调功能（DCF）MAC协议运行的节点的属性。然后，使用节点模型对单跳自组织网络进行吞吐量和延迟分析，其中不同的节点可能具有不同的流量负载。多跳自组织网络分析固有的复杂性，加上一个节点的行为不仅取决于其邻居的行为，还取决于其他未见节点的行为，这一事实使多跳分析变得极为困难。然而，本文分析多跳网络的方法为这些复杂网络提供了非常准确的近似值。其次，针对多跳自组织网络MAC协议提出了一种新的传输策略，该策略提高了网络等待时间，这是一项基本的QoS措施。新的MAC协议称为多功率MAC（MP-MAC），通过将建议的MAC层分析模型扩展到新协议来进行性能分析。在低负载和中等负载条件下，等待时间减少因子大于2，而对于高负载则接近1。该协议通过引入多功率选项并自适应地从选项集中选择发射功率来实现此目的，从而在不影响网络吞吐量的情况下减少了每个数据包的平均跳数。这个新想法可以应用于任何临时访问方法，但是由于802.11 DCF MAC是研究最多的无线LAN协议，因此已选择它来演示新协议的效果。

著录项

  • 作者

    Alizadeh-Shabdiz, Farshid.;

  • 作者单位

    The George Washington University.;

  • 授予单位 The George Washington University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 D.Sc.
  • 年度 2004
  • 页码 135 p.
  • 总页数 135
  • 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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