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Multi-Channel Distributed Coordinated Function over Single Radio in Wireless Sensor Networks

机译：无线传感器网络中单无线电上的多通道分布式协调功能

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摘要

Multi-channel assignments are becoming the solution of choice to improve performance in single radio for wireless networks. Multi-channel allows wireless networks to assign different channels to different nodes in real-time transmission. In this paper, we propose a new approach, Multi-channel Distributed Coordinated Function (MC-DCF) which takes advantage of multi-channel assignment. The backoff algorithm of the IEEE 802.11 distributed coordination function (DCF) was modified to invoke channel switching, based on threshold criteria in order to improve the overall throughput for wireless sensor networks (WSNs) over 802.11 networks. We presented simulation experiments in order to investigate the characteristics of multi-channel communication in wireless sensor networks using an NS2 platform. Nodes only use a single radio and perform channel switching only after specified threshold is reached. Single radio can only work on one channel at any given time. All nodes initiate constant bit rate streams towards the receiving nodes. In this work, we studied the impact of non-overlapping channels in the 2.4 frequency band on: constant bit rate (CBR) streams, node density, source nodes sending data directly to sink and signal strength by varying distances between the sensor nodes and operating frequencies of the radios with different data rates. We showed that multi-channel enhancement using our proposed algorithm provides significant improvement in terms of throughput, packet delivery ratio and delay. This technique can be considered for WSNs future use in 802.11 networks especially when the IEEE 802.11n becomes popular thereby may prevent the 802.15.4 network from operating effectively in the 2.4 GHz frequency band.
机译：多信道分配正成为提高无线网络单无线电性能的首选解决方案。多通道允许无线网络在实时传输中将不同的通道分配给不同的节点。在本文中，我们提出了一种新的方法，即多通道分布式协调功能（MC-DCF），该方法利用了多通道分配的优势。基于阈值标准，IEEE 802.11分布式协调功能（DCF）的退避算法已修改为调用信道切换，以提高802.11网络上无线传感器网络（WSN）的总体吞吐量。为了研究使用NS2平台的无线传感器网络中多通道通信的特性，我们提出了仿真实验。节点仅使用单个无线电，并且仅在达到指定的阈值后才执行信道切换。单个无线电在任何给定时间只能在一个频道上工作。所有节点都向接收节点启动恒定比特率流。在这项工作中，我们研究了2.4频段中非重叠信道对以下方面的影响：恒定比特率（CBR）流，节点密度，源节点直接将数据发送到接收器以及通过改变传感器节点之间的距离和操作来增强信号强度具有不同数据速率的无线电频率。我们表明，使用我们提出的算法进行的多通道增强功能在吞吐量，数据包传输率和延迟方面均提供了显着改善。可以考虑将该技术用于802.11网络中的WSN将来使用，尤其是当IEEE 802.11n变得流行时，从而可能阻止802.15.4网络在2.4 GHz频带中有效运行。

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