Superframe Duration Allocation Schemes to Improve the Throughput of Cluster-Tree Wireless Sensor Networks.
Superframe Duration Allocation Schemes to Improve the Throughput of Cluster-Tree Wireless Sensor Networks.
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DOI：
10.3390/s17020249
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发表时间：
2017-01-27
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影响因子：
--
通讯作者：
Vasques F
中科院分区：
文献类型：
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作者：
Leão E;Montez C;Moraes R;Portugal P;Vasques F
无线传感器网络(WSN)技术的使用是支持大规模监测应用的一个有吸引力的选择，例如在精准农业、环境监测和工业自动化中可以找到的应用。IEEE 802.15.4/ZigBee簇树拓扑结构适合构建大规模的无线传感器网络。尽管簇树网络有一些已知的优点，包括定时同步和占空比操作，但由于其通信流量的汇聚广播模式，它可能会遭受严重的网络拥塞问题。因此，仔细调整分配给簇头的传输机会(超帧时长)是一个重要的研究问题。基于定义良好的协议和时序模型，根据子节点施加的消息负载(Load-SDA方案)或每个簇头的子代节点数量(Nodes-SDA方案)，提出了一组比例超帧持续时间分配(SDA)方案。其基本原因是充分分配传输机会(超帧时长)和参数化缓冲区大小，以提高网络吞吐量并避免典型问题，如：网络拥塞、高端到端通信延迟和因缓冲区溢出而丢弃的消息。仿真评估表明，所提出的分配方案可以明显改善大规模簇树网络的运行。
The use of Wireless Sensor Network (WSN) technologies is an attractive option to support wide-scale monitoring applications, such as the ones that can be found in precision agriculture, environmental monitoring and industrial automation. The IEEE 802.15.4/ZigBee cluster-tree topology is a suitable topology to build wide-scale WSNs. Despite some of its known advantages, including timing synchronisation and duty-cycle operation, cluster-tree networks may suffer from severe network congestion problems due to the convergecast pattern of its communication traffic. Therefore, the careful adjustment of transmission opportunities (superframe durations) allocated to the cluster-heads is an important research issue. This paper proposes a set of proportional Superframe Duration Allocation (SDA) schemes, based on well-defined protocol and timing models, and on the message load imposed by child nodes (Load-SDA scheme), or by number of descendant nodes (Nodes-SDA scheme) of each cluster-head. The underlying reasoning is to adequately allocate transmission opportunities (superframe durations) and parametrize buffer sizes, in order to improve the network throughput and avoid typical problems, such as: network congestion, high end-to-end communication delays and discarded messages due to buffer overflows. Simulation assessments show how proposed allocation schemes may clearly improve the operation of wide-scale cluster-tree networks.