The Synergy of Complex Event Processing and Tiny Machine Learning in Industrial IoT

TL;DR

This paper presents a framework combining tiny machine learning and micro complex event processing to enable decentralized, energy-efficient, and adaptable data analysis directly on resource-constrained IIoT edge devices, demonstrated through an industrial safety use case.

Contribution

It introduces a novel framework that integrates tiny ML and micro CEP for on-device processing in IIoT, reducing reliance on cloud computing and enabling flexible, real-time analytics on edge devices.

Findings

Effective on-device ML and CEP integration demonstrated

Reduced data transmission and energy consumption shown

Flexible model and logic updates achieved without full reprogramming

Abstract

Focusing on comprehensive networking, big data, and artificial intelligence, the Industrial Internet-of-Things (IIoT) facilitates efficiency and robustness in factory operations. Various sensors and field devices play a central role, as they generate a vast amount of real-time data that can provide insights into manufacturing. The synergy of complex event processing (CEP) and machine learning (ML) has been developed actively in the last years in IIoT to identify patterns in heterogeneous data streams and fuse raw data into tangible facts. In a traditional compute-centric paradigm, the raw field data are continuously sent to the cloud and processed centrally. As IIoT devices become increasingly pervasive and ubiquitous, concerns are raised since transmitting such amount of data is energy-intensive, vulnerable to be intercepted, and subjected to high latency. The data-centric paradigm can essentially solve these problems by empowering IIoT to perform decentralized on-device ML and CEP, keeping data primarily on edge devices and minimizing communications. However, this is no mean feat because most IIoT edge devices are designed to be computationally constrained with low power consumption. This paper proposes a framework that exploits ML and CEP's synergy at the edge in distributed sensor networks. By leveraging tiny ML and micro CEP, we shift the computation from the cloud to the power-constrained IIoT devices and allow users to adapt the on-device ML model and the CEP reasoning logic flexibly on the fly without requiring to reupload the whole program. Lastly, we evaluate the proposed solution and show its effectiveness and feasibility using an industrial use case of machine safety monitoring.