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Analysis of buffer size dimensioning in GTS enabled IEEE 802.15.4 WSN for real-time applications

机译:分析启用GTS的IEEE 802.15.4 WSN中用于实时应用的缓冲区大小

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摘要

This paper explores the problem of bandwidth under utilisation in WSN, and evaluates the guaranteed time slot (GTS) mechanism performance using OPNET™. Time-critical applications for WSNs are an important class of services supported by the IEEE 802.15.4 standard. The IEEE 802.15.4 standard grants exclusive use of a wireless channel for time-critical traffic through GTS medium access control (MAC) mechanism. The GTS is activated in the beacon-enabled mode based on the superframe structure. A node has to use at least one whole GTS in a transmission. However, each node may not fully utilise its transmission capacity in a particular time slot if the packet arrival rate is too small. Hence, bandwidth utilisation is reduced. Queue management and buffer dimensioning at the nodes becomes an important factor to quantity the optimal parameters to tune the network for a better performance without making any modifications to the existing protocol.
机译:本文探讨了WSN中带宽利用率不足的问题,并使用OPNET™评估了保证时隙(GTS)机制的性能。 WSN的时间关键型应用程序是IEEE 802.15.4标准支持的重要服务类别。 IEEE 802.15.4标准通过GTS媒体访问控制(MAC)机制为时间紧迫的流量授予无线信道专用权。基于超帧结构,以信标使能模式激活GTS。节点必须在传输中使用至少一个完整的GTS。但是,如果分组到达速率太小,则每个节点可能无法在特定时隙中充分利用其传输容量。因此,带宽利用率降低。节点上的队列管理和缓冲区大小已成为确定最佳参数的重要因素,从而可以在不对现有协议进行任何修改的情况下调整网络以获得更好的性能。

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