Industrial Wi-Fi: Enabling Industrial Internet of Things with Wi-Fi

The rapid progress of Industry 4.0 envisions smart factories where manufacturing equipment, robotic systems, and safety devices operate as a single converged network with minimal human involvement. The Industrial Internet of Things (IIoT) is central to this vision, promising tighter coordination between autonomous machines and more adaptive production lines.

Wireless connectivity plays a crucial role in realizing this potential. Unlike wired solutions, wireless networks reduce installation complexity, lower maintenance costs, and enable equipment mobility—particularly valuable for robotic arms, autonomous vehicles, and rotary machinery where cabling is impractical. Wi-Fi stands out as a promising candidate for industrial wireless: it is widely available, cost-effective, and continuously evolving. However, industrial control applications impose stringent Quality of Service (QoS) requirements: packet delays must stay within a few milliseconds, jitter should not exceed microseconds, and packet loss must be near-zero. Achieving these targets with Wi-Fi demands deep understanding of its internal mechanisms and careful optimization.

The Wireless Network Lab has extensive expertise in adapting Wi-Fi for such demanding industrial use cases. Thanks to deep knowledge of wireless protocols and hands-on research experience, the team has demonstrated how even existing Wi-Fi standards can be fine-tuned to satisfy the unique QoS requirements of industrial scenarios. Members have analyzed key mechanisms of recent 802.11 standards and developed an optimized communication framework for Wi-Fi 6, which is already widely deployed. The solution combines OFDMA for efficient multi-user transmission, specific packet aggregation to reduce protocol overhead, network-wide time synchronization, scheduled channel access to eliminate contention, and interference coordination between overlapping networks. Simulation results demonstrated that the proposed approach supports more than 50 industrial devices per shared 20 MHz channel with packet loss below 10^-6 and cycle times under 4 milliseconds—more than doubling the capacity of default Wi-Fi 6 configurations. The Wireless Network Lab has also carried out several industrial projects within this domain.