Location-Aware Power-Efficient Directional MAC Protocol in Ad Hoc Networks Using Directional Antenna
Location-Aware Power-Efficient Directional MAC Protocol in Ad Hoc Networks Using Directional Antenna
复制标题
使用定向天线的 Ad Hoc 网络中位置感知的高能效定向 MAC 协议
DOI：
10.1093/ietcom/e88-b.3.1169
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
S. Bandyopadhyay
中科院分区：
文献类型：
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作者：
T. Ueda;Shinsuke Tanaka;D. Saha;Siuli Roy;S. Bandyopadhyay
在自组织无线网络中使用定向天线可以极大地减少无线电干扰，从而提高无线介质的利用率。我们在本文中的主要贡献是设计了一种MAC协议，该协议利用自组织网络中定向天线的优势来提高系统性能。本文以有效利用共享无线介质为目标，提出了一种基于定向天线的自组织网络MAC协议。为了在这种情况下实现有效的MAC协议，节点应该知道如何设置其传输方向以向其邻居传输分组，并且避免在数据通信已经在进行中的其他方向上传输。在本文中，我们提出了一种以接收者为中心的位置跟踪方法和MAC协议，使节点能够知道自己的邻域和节点的方向，以便进行定向通信。节点从这些邻域感知和方向感知中发展其位置感知。在这种情况下，研究人员通常假设定向天线的增益等于相应的全向天线的增益。然而，对于给定的输入功率，采用定向天线的距离R将远远大于采用全向天线的距离R。在本文中，我们还提出了一种两级发射功率控制机制，以近似均衡工作在全向和定向模式下的天线的发射距离R。这不仅将提高介质利用率，而且还有助于在定向传输期间节省发射节点的功率。我们提出的定向MAC协议既可以在串和并行拓扑中模拟的智能交通系统(ITS)中有效，也可以在任意社区网络中(随机拓扑中模拟)有效。在QualNet网络模拟器上的性能评估表明了该协议的有效性。
Use of directional antenna in the context of ad hoc wireless networks can largely reduce radio interference, thereby improving the utilization of wireless medium. Our major contribution in this paper is to devise a MAC protocol that exploits the advantages of directional antenna in ad hoc networks for improved system performance. In this paper, we have illustrated a MAC protocol for ad hoc networks using directional antenna with the objective of effective utilization of the shared wireless medium. In order to implement effective MAC protocol in this context, a node should know how to set its transmission direction to transmit a packet to its neighbors and to avoid transmission in other directions where data communications are already in progress. In this paper, we are proposing a receiver-centric approach for location tracking and MAC protocol, so that, nodes become aware of its neighborhood and also the direction of the nodes for communicating directionally. A node develops its location-awareness from these neighborhood-awareness and direction-awareness. In this context, researchers usually assume that the gain of directional antennas is equal to the gain of corresponding omni-directional antenna. However, for a given amount of input power, the range R with directional antenna will be much larger than that using omni-directional antenna. In this paper, we also propose a two level transmit power control mechanism in order to approximately equalize the transmission range R of an antenna operating at omni-directional and directional mode. This will not only improve medium utilization but also help to conserve the power of the transmitting node during directional transmission. Our proposed directional MAC protocol can be effective in both ITS (Intelligent Transportation System), which we simulate in String and Parallel Topology, and in any community network, which we simulate in Random Topology. The performance evaluation on QualNet network simulator clearly indicates the efficiency of our protocol.