The vision for smart city imperiously appeals to the implementation of Internet-of-Things (IoT), some features of which, such as massive access and bursty short packet transmissions, require new methods to enable the cellular system to seamlessly support its integration. Rigorous theoretical analysis is indispensable to obtain constructive insight for the networking design of massive access. In this paper, we propose and define the notion of massive and sporadic access (MSA) to quantitatively describe the massive access of IoT devices. We evaluate the temporal correlation of interference and successful transmission events, and verify that such correlation is negligible in the scenario of MSA. In view of this, in order to resolve the difficulty in any precise spatio-temporal analysis where complex interactions persist among the queues, we propose an approximation that all nodes are moving so fast that their locations are independent at different time slots. Furthermore, we compare the original static network and the equivalent network with high mobility to demonstrate the effectiveness of the proposed approximation approach. The proposed approach is promising for providing a convenient and general solution to evaluate and design the IoT network with massive and sporadic access.

中文翻译：

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大规模和零星访问的时空建模

智慧城市的愿景强烈呼吁物联网 (IoT) 的实施，其中一些特性，例如海量接入和突发短数据包传输，需要新的方法来使蜂窝系统能够无缝支持其集成。严谨的理论分析对于海量接入的组网设计获得建设性的见解是必不可少的。在本文中，我们提出并定义了大规模和零星访问 (MSA) 的概念，以定量描述物联网设备的大规模访问。我们评估干扰和成功传输事件的时间相关性，并验证这种相关性在 MSA 场景中可以忽略不计。有鉴于此，为了解决队列之间复杂交互持续存在的任何精确时空分析的困难，我们提出了一个近似值，即所有节点都移动得如此之快，以至于它们的位置在不同的时隙是独立的。此外，我们比较了原始静态网络和具有高移动性的等效网络，以证明所提出的近似方法的有效性。所提出的方法有望提供一种方便和通用的解决方案来评估和设计具有大量和零星访问的物联网网络。