The Internet of Things (IoT) expands the ability of human beings to sense, understand, and interact with the world. It is profoundly changing the human living environment and our way of life. The total number of devices connected through the Internet of Things reached 26.1 billion in 2020, whilst the average annual compound growth rate reached 35%, of which wireless sensors and other network nodes account for about 60% of the total.
Sensors are typically reliant on batteries and as such inherently energy dependent. The passive (battery-free) IoT has begun to emerge to address this, bringing in a new paradigm of passive sensor networks. The aim of this new paradigm is that IoT nodes would not need to be equipped with power devices (batteries), but could obtain energy (and therefore sensory input) from their local, physical environment to support themselves.

If these passive sensor networks do not require the same level of maintenance, they can be suited to harsh, dangerous-to-access locations, thereby minimizing safety risk to researchers and engineers. However, these systems are difficult to design, existing networking methods are not yet suitable for passive sensory transmission, and the quality of the data gathered can be low.

This Special Issue aims to focus discussion on the benefits and limitations of the passive IoT. We welcome research on medium access control, wearables, and applications of Fog/Edge computing to passive sensing networks, as well as sensor/system architecture and network framework discussions. These should be in the form of standard research articles or literature review articles. Full submissions of accepted abstracts should be completed by November 10th, 2023. Authors that require more time should contact communities@peerj.com to request an extension.

Topics - including, but not limited to:
*New Paradigm, Architecture And Framework For Passive IoT
*Security And Privacy Issues For Passive IoT
*Radio Frequency (RF) Fingerprint For Passive IoT Devices
*Theory And Method Of Energy-Centric High-Quality Perception Data Acquisition
*Data Processing And Analysis Technologies In Passive IoT
*Theory And Method Of Node Energy Acquisition And Network Energy Configuration
*Theory And Method Of Networking And Communication Of Energy-Centered Passive *Transmission Network
*Medium Access Control For Passive IoT
*Mobility, Localization And Management Aspects For Passive IoT
*Application Of Fog/Edge Computing To Passive IoT
*Wearables, Body Sensor Networks, Smart Portable, WiFi, RFID Etc.