最小化无线工业物联网中多址接入的采集年龄
Minimizing Age of Collection for Multiple Access in Wireless Industrial Internet of Things
AI总结：
本文研究IIoT系统的信息新鲜度，以采集年龄（AoC）为指标，理论分析与软件无线电实验表明，带重传的TDMA在低SNR下表现稳定，而FDMA在高SNR下因MAC开销更低而更优。
摘要：
本文研究了工业物联网（IIoT）系统的信息新鲜度，其中每个IoT设备对共同目标进行部分观测，并将信息更新传输至中央接收机以恢复完整观测。我们将采集年龄（AoC）性能作为信息新鲜度的衡量标准。与传统的信息年龄（AoI）指标不同，瞬时AoC仅在成功接收到用于共同观测的所有协作数据包时才会下降。因此，在IoT设备之间有效分配无线时频资源，以在中央接收机处实现低平均AoC至关重要。本文考虑了三种多址接入方案：无重传的时分多址（TDMA）、带重传的TDMA以及频分多址（FDMA）。首先，我们的理论分析表明，带重传的TDMA在平均AoC方面优于其他两种方案。随后，我们在软件无线电上实现了基于这三种方案的信息更新系统。实验结果表明，考虑到实际中的介质访问控制（MAC）开销，在高信噪比（SNR）区域，FDMA实现了比带或不带重传的TDMA更低的平均AoC。相比之下，带重传的TDMA在广泛的SNR范围内提供了稳定且相对较低的平均AoC，这有利于IIoT应用。总体而言，我们对IIoT信息更新系统中的AoC进行了理论与实验相结合的研究。
英文摘要：
This paper investigates the information freshness of Industrial Internet of Things (IIoT) systems, where each IoT device makes a partial observation of a common target and transmits the information update to a central receiver to recover the complete observation. We consider the age of collection (AoC) performance as a measure of information freshness. Unlike the conventional age of information (AoI) metric, the instantaneous AoC decreases only when all cooperative packets for a common observation are successfully received. Hence, effectively allocating wireless time-frequency resources among IoT devices to achieve a low average AoC at the central receiver is paramount. Three multiple access schemes are considered in this paper: time-division multiple access (TDMA) without retransmission, TDMA with retransmission, and frequency-division multiple access (FDMA). First, our theoretical analysis indicates that TDMA with retransmission outperforms the other two schemes in terms of average AoC. Subsequently, we implement information update systems based on the three schemes on software-defined radios. Experimental results demonstrate that considering the medium access control (MAC) overhead in practice, FDMA achieves a lower average AoC than TDMA with or without retransmission in the high signal-to-noise ratio (SNR) regime. In contrast, TDMA with retransmission provides a stable and relatively low average AoC over a wide SNR range, which is favorable for IIoT applications. Overall, we present a theoretical-plus-experimental investigation of AoC in IIoT information update systems.
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