In this two-part paper, we propose a novel medium access control (MAC) protocol for machine-type communications in the industrial internet of things. The considered use case features a limited geographical area and a massive number of devices with sporadic data traffic and different priority types. We target at supporting the devices while satisfying their quality of service (QoS) requirements with a single access point and a single channel, which necessitates a customized design that can significantly improve the MAC performance. In Part I of this paper, we present the MAC protocol that comprises a new slot structure, corresponding channel access procedure, and mechanisms for supporting high device density and providing differentiated QoS. A key idea behind this protocol is sensing-based distributed coordination for significantly improving channel utilization. To characterize the proposed protocol, we analyze its delay performance based on the packet arrival rates of devices. The analytical results provide insights and lay the groundwork for the fine-grained scheduling with QoS guarantee as presented in Part II.

中文翻译：

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用于工业物联网中的机器类型通信的MAC-第一部分：协议设计和分析

在这篇由两部分组成的论文中，我们提出了一种用于工业物联网中机器类型通信的新型媒体访问控制（MAC）协议。考虑的用例具有有限的地理区域和大量具有零星数据流量和不同优先级类型的设备。我们的目标是支持设备，同时通过单个接入点和单个通道满足其服务质​​量（QoS）要求，这需要进行定制化设计，从而可以显着提高MAC性能。在本文的第一部分中，我们介绍了MAC协议，该协议包括一个新的时隙结构，相应的信道访问过程以及支持高设备密度和提供差异化​​QoS的机制。该协议背后的关键思想是基于感知的分布式协调，可显着提高信道利用率。为了表征所提出的协议，我们基于设备的分组到达率来分析其延迟性能。分析结果提供了见解，并为第二部分中介绍的具有QoS保证的细粒度调度奠定了基础。