[Paper Review] Towards the Internet of X-things: New Possibilities for Underwater, Underground, and Outer Space Exploration

Nasir Saeed, Mohamed‐Slim Alouini+1 more|arXiv (Cornell University)|Mar 28, 2019

Underwater Vehicles and Communication Systems4 citations

TL;DR

This paper proposes a unified framework for the Internet of X-things (X-IoT), integrating underwater (IoUT), underground (IoUGT), and space-based (IoST) networks to enable smart exploration in extreme environments. By leveraging emerging communication technologies, the framework addresses cross-domain challenges in resource monitoring, agriculture, and space exploration, offering a scalable solution for future planetary and extraterrestrial sustainability.

ABSTRACT

The rapid growth of the world's population demands more natural resources, food, and space. World-renowned physicist Stephan Hawking has argued that soon we will require another world to live on because we are running out of space and natural resources. This ever-increasing demand for resources and space needs novel technologies to explore natural resources, produce more crops, and explore outer space. Internet of X-things (X-IoT) is an enabling technology to overcome all of the above issues. In this article, we have presented an overview of a unified framework of X-IoT. The framework of X-IoT consists of three major categories. The first one is the Internet of underwater things (IoUT) for smart oceans. The second category is the Internet of underground things (IoUGT) for smart agriculture, seismic monitoring, and Oil/Gas fields. The third category is the Internet of space things (IoST) for outer space exploration, to provide global coverage, and to enable inter-satellite communications. Through this framework, we get to know what has been done since recently and how the technical challenges across the broad spectrum of emerging use cases under the water, underground and over the space are converging toward future solutions.

Motivation & Objective

• Address the growing global demand for natural resources, food, and living space due to population growth.
• Overcome limitations in traditional exploration methods by enabling real-time, networked sensing in extreme environments.
• Develop a unified X-IoT framework integrating IoUT, IoUGT, and IoST to support sustainable resource management and space exploration.
• Identify and analyze technical challenges common across underwater, underground, and outer space communication scenarios.
• Provide a roadmap for future research and deployment of X-IoT in smart oceans, agriculture, and space infrastructure.

Proposed method

• Propose a three-tiered X-IoT framework comprising Internet of Underwater Things (IoUT), Internet of Underground Things (IoUGT), and Internet of Space Things (IoST).
• Utilize underwater acoustic and optical communications for IoUT to enable data transmission in marine environments.
• Apply wireless sensor networks and low-frequency radio wave propagation for IoUGT to support subsurface monitoring in agriculture and oil/gas fields.
• Enable inter-satellite communication and global coverage via satellite-based IoST for deep-space and Earth-orbiting applications.
• Integrate heterogeneous communication technologies across domains to ensure interoperability and scalability.
• Leverage signal processing and networking protocols to address challenges such as high latency, path loss, and environmental interference.

Experimental results

Research questions

• RQ1 How can a unified X-IoT framework be designed to support diverse and extreme environments such as underwater, underground, and outer space?
• RQ2 What are the key technical challenges in deploying IoUT, IoUGT, and IoST, and how can they be addressed using existing and emerging communication technologies?
• RQ3 In what ways can X-IoT enhance resource monitoring, agricultural productivity, and space exploration?
• RQ4 How do communication constraints such as high latency and path loss vary across underwater, underground, and space environments, and what solutions are viable?
• RQ5 What role does signal processing play in enabling reliable data transmission across the three X-IoT domains?

Key findings

• The X-IoT framework enables real-time, large-scale monitoring of underwater ecosystems, supporting smart ocean management and resource discovery.
• IoUGT applications show promise in enhancing precision agriculture and seismic monitoring through underground sensor networks.
• IoST facilitates global satellite coverage and inter-satellite communication, critical for deep-space exploration and Earth observation.
• Cross-domain challenges such as high propagation delay, signal attenuation, and energy constraints are identified as key barriers.
• The integration of signal processing and networking protocols across IoUT, IoUGT, and IoST enables scalable and interoperable communication solutions.
• The framework provides a foundational roadmap for future deployment of X-IoT in extreme environments, promoting sustainability and innovation.