Introduction
The internet of things (IoT) market is a major source of revenue for future wireless technology. Moving beyond enhancement of the mobile broadband devices market that is supported by fourth-generation (4G) cellular technology, ultra reliable low-latency communication (URLLC) and machine type communication (MTC) service classes were also introduced in fifth-generation (5G) cellular technology, which target use cases requiring high reliability and massive deployment of smaller and cheaper IoT devices, respectively. Sixth-generation (6G) technology will further expand these market segments. The IoT market is expected to steadily grow from 2020 to 2025, and further increase is expected beyond that period at a higher rate. Building and commercial, health, agriculture, infrastructure, and industries are some of the key sectors targeted by the IoT market. Almost all sectors are forecasted to grow in the future, but infrastructure and health segments are expected to grow at higher rates in the future compared to others [1].