Information freshness and high energy-efficiency are key requirements for sensor nodes serving Industrial Internet of Things (IIoT) applications, where a sink node must collect informative data before a deadline to control an external element. Pull-based communication is an interesting approach for optimizing information freshness and saving wasteful energy. To this end, we apply Content-based Wake-up (CoWu), in which the sink can activate a subset of nodes observing informative data at the time that wake-up signal is received. In this case, the timing of the wake-up signal plays an important role: early transmission leads to high reliability in data collection, but the received data may become obsolete by the deadline, while later transmission ensures a higher timeliness of the sensed data, but some nodes might not manage to communicate their data before the deadline. This letter investigates the timing for data collection using CoWu and characterizes the gain of CoWu. The obtained numerical results show that CoWu improves accuracy, while reducing energy consumption by about 75% with respect to round-robin scheduling.
翻译:信息新鲜度和高能效是服务于工业用物互联网(IIoT)应用的传感器节点的关键要求,在这种节点中,汇节点必须在控制外部要素的最后期限前收集信息数据。拉动通信是优化信息新鲜度和节省浪费能源的有趣方法。为此,我们采用基于内容的唤醒(CoWu)方法,使汇点能够在收到觉醒信号时激活一组观测信息数据的节点。在此情况下,觉醒信号的时机起着重要作用:早期传输导致数据收集的高度可靠性,但收到的数据可能在截止日期前过时,而后来的传输则确保感测数据的更及时性,但有些节点可能无法在截止日期前传送数据。本信调查利用CoWu收集数据的时间,并描述CoWu的收益。获得的数字结果显示,CoWu提高了准确性,同时将圆柱列表的能源消耗减少约75%。