Freshness of status update packets is essential for enabling a wide range of applications in wireless sensor networks (WSNs). Accordingly, we consider a WSN where sensors communicate status updates to a destination by contending for the channel access based on a carrier sense multiple access (CSMA) method. We analyze the worst case average age of information (AoI) and average peak AoI from the view of one sensor in a system where all the other sensors have a saturated queue. Numerical results illustrate the importance of optimizing the contention window size and the packet arrival rate to maximize the information freshness.

中文翻译：

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无线传感器网络中信息的最坏情况时代：多接入信道

状态更新数据包的新鲜度对于实现无线传感器网络 (WSN) 中的广泛应用至关重要。因此，我们考虑一个 WSN，其中传感器通过基于载波侦听多路访问 (CSMA) 方法竞争信道访问来将状态更新传送到目的地。我们从系统中的一个传感器的角度分析最坏情况下的平均信息年龄 (AoI) 和平均峰值 AoI，其中所有其他传感器的队列都已饱和。数值结果说明了优化竞争窗口大小和数据包到达率以最大化信息新鲜度的重要性。