Owing to provision of a long-range and robust link, LoRa technology has drawn attention for the use in industrial data collection networks. This article proposes a real-time LoRa protocol that can effectively deal with both periodic and aperiodic data. The slots in a frame are logically partitioned such that they are first scheduled for periodic data by a slot scheduling algorithm, and then, the remaining unscheduled slots are used for event-driven aperiodic data. In this logical frame partitioning, the unscheduled slots appear in an interleaved fashion so that aperiodic tasks can transmit data with low delay and fairness while every periodic task still completes data transmission before the beginning of the next period. To deal with the problems of data collision and traffic congestion for aperiodic data, a two-level collision avoidance scheme is proposed that adopts the notion of a contention window and a delay slot. According to simulation, not only can the proposed protocol guarantee the timely delivery of periodic data but it can also deal with aperiodic data with high reliability, fairness, and low delay, compared with other recent protocols.

中文翻译：

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使用逻辑帧分区进行周期性和非周期性数据传输的实时LoRa协议


由于提供长距离且稳健的链路，LoRa 技术在工业数据收集网络中的应用引起了人们的关注。本文提出了一种实时LoRa协议，可以有效处理周期性和非周期性数据。帧中的时隙被逻辑划分，使得它们首先通过时隙调度算法被调度用于周期性数据，然后，剩余的未调度时隙用于事件驱动的非周期性数据。在这种逻辑帧划分中，非调度时隙以交织的方式出现，使得非周期性任务可以低延迟和公平地传输数据，而每个周期性任务仍然在下一个周期开始之前完成数据传输。为了解决非周期数据的数据冲突和流量拥塞问题，提出了一种采用竞争窗口和延迟时隙概念的两级冲突避免方案。仿真结果表明，与其他最新协议相比，该协议不仅能够保证周期性数据的及时传递，而且能够处理非周期性数据，具有高可靠性、公平性和低延迟。