Integrating Sensing and Communications for Ubiquitous IoT: Applications, Trends and Challenges

TL;DR

This paper reviews the emerging integration of sensing and communication technologies in IoT, highlighting benefits, use cases, classifications, and future challenges to guide researchers and industry.

Contribution

It provides a comprehensive overview of ISAC, introduces the concept of the signaling layer in IoT, and classifies existing solutions with insights into challenges and opportunities.

Findings

ISAC offers integration and coordination gains in IoT.

The signaling layer is a key concept in the evolution of IoT architecture.

Classification of ISAC solutions based on integration layers.

Abstract

Recent advances in wireless communication and solid-state circuits together with the enormous demands of sensing ability have given rise to a new enabling technology, integrated sensing and communications (ISAC). The ISAC captures two main advantages over dedicated sensing and communication functionalities: 1) Integration gain to efficiently utilize congested resources, and even, 2) Coordination gain to balance dual-functional performance or/and perform mutual assistance. Meanwhile, triggered by ISAC, we are also witnessing a paradigm shift in the ubiquitous IoT architecture, in which the sensing and communication layers are tending to converge into a new layer, namely, the signaling layer. In this paper, we first attempt to introduce a definition of ISAC, analyze the various influencing forces, and present several novel use cases. Then, we complement the understanding of the signaling layer by presenting several key benefits in the IoT era. We classify existing dominant ISAC solutions based on the layers in which integration is applied. Finally, several challenges and opportunities are discussed. We hope that this overview article will serve as a primary starting point for new researchers and offer a bird's-eye view of the existing ISAC-related advances from academia and industry, ranging from solid-state circuitry, signal processing, and wireless communication to mobile computing.