From Wi-Fi 4 to Wi-Fi 8: How Wi-Fi Is Becoming an IoT Technology
A new review in the International Journal of Leading Research Publication (IJLRP) traces the evolution of Wi-Fi from Wi-Fi 4 to Wi-Fi 7 and its implications for IoT connectivity. The paper also examines Wi-Fi HaLow for long-range, low-power applications and looks ahead to Wi-Fi 8, where reliability rather than peak speed is expected to become a central design goal.
Wi-Fi was originally optimized for laptops, smartphones and high-speed consumer connectivity. But as the number of connected devices has grown, the requirements have changed.
The review by Shirin Bahar, Senior Systems Engineer at CommScope, examines how the IEEE 802.11 family has evolved from Wi-Fi 4 through Wi-Fi 7 and what each generation contributes to Internet of Things connectivity. It focuses on the mechanisms that matter most for IoT, including OFDMA, Target Wake Time, 6 GHz spectrum, Multi-Link Operation, Wi-Fi HaLow and WPA3 security.
Modern Wi-Fi is increasingly shaped not only by the pursuit of higher peak data rates, but by the requirements of dense device environments, battery-powered sensors, time-critical applications and distributed IoT systems.
Wi-Fi 6 Changed the Equation for Dense IoT
Wi-Fi 4 and Wi-Fi 5 primarily increased bandwidth and capacity. Their contribution to IoT was important, but indirect.
The major shift came with Wi-Fi 6, based on IEEE 802.11ax.
Two technologies are particularly important for IoT: Orthogonal Frequency-Division Multiple Access (OFDMA) and Target Wake Time (TWT).
OFDMA divides a wireless channel into smaller resource units, allowing several devices to communicate within the same transmission. This is particularly relevant for IoT environments where large numbers of sensors send small, frequent packets.
TWT addresses another critical issue: battery life. Devices can negotiate scheduled wake and sleep periods with the access point instead of continuously waking to listen for network traffic. This can significantly reduce power consumption and also support more predictable communications.
Wi-Fi 6E adds access to the 6 GHz band, introducing additional spectrum with less legacy interference and making the technology more attractive for high-density and latency-sensitive environments.
Wi-Fi 7 Brings Multi-Link Reliability
With Wi-Fi 7, IEEE 802.11be, the focus moves further toward predictable and responsive connectivity.
Its defining feature is Multi-Link Operation (MLO). Instead of relying on a single frequency band, compatible devices can use 2.4, 5 and 6 GHz links together.
That can increase bandwidth, but the paper highlights another important advantage for IoT: reliability. Traffic can be moved to a cleaner frequency band or duplicated across multiple links, helping to reduce packet loss and latency spikes.
These capabilities are particularly relevant for emerging applications such as industrial control, augmented-reality tools and edge-AI inference, where predictable connectivity can be more important than theoretical peak speed.
Wi-Fi HaLow Extends Wi-Fi Beyond the Building
Not every IoT application needs gigabit throughput.
For sensors, agriculture, industrial monitoring and utilities, range and energy efficiency can matter more. This is where Wi-Fi HaLow, based on IEEE 802.11ah, enters the picture.
HaLow operates in sub-1 GHz spectrum, giving it better propagation and wall penetration than conventional Wi-Fi at 2.4 or 5 GHz. Under suitable conditions, the technology can reach around one kilometre while supporting large numbers of endpoints.
The review positions Wi-Fi HaLow between traditional short-range Wi-Fi and low-power wide-area technologies. Applications include smart agriculture, utility monitoring, industrial IoT, logistics and extended-coverage campus or smart-home networks.
Wi-Fi HaLow Reaches Farther Than Wi-Fi and Transmits 1.000x More Data Than LoRaWAN
Wi-Fi HaLow fundamentally transforms IoT connectivity by combining long-range, high data throughput, low power consumption, and standardized IP-based integration, overcoming limitations of existing wireless technologies.
Security Evolves Alongside Connectivity
The Wi-Fi evolution is not limited to radio performance.
The transition from WPA2 to WPA3 strengthened authentication and encryption, while Wi-Fi Easy Connect was introduced to simplify onboarding for devices without displays or keyboards.
This is especially relevant for IoT, where thousands of constrained devices may need to be securely commissioned and managed.
The challenge remains that many low-cost devices do not always adopt the latest security mechanisms, meaning the practical security level of a network can still depend on its weakest endpoint.
Wi-Fi 8 Could Make Reliability the Headline Feature
The next major step is already taking shape.
Wi-Fi 8, based on IEEE 802.11bn, is being developed around Ultra High Reliability. Instead of focusing primarily on another increase in peak throughput, the goal is more dependable, low-variance connectivity.
For time-critical IoT, this could be more important than another headline speed record.
The review identifies energy consumption, coexistence and interoperability as continuing challenges. The crowded 2.4 GHz band must accommodate Wi-Fi alongside technologies such as Bluetooth, Zigbee and Thread, while many IoT environments need several different wireless technologies to work together.
Wi-Fi Is Becoming More Specialized for IoT
For IoT, the evolution of Wi-Fi is increasingly about matching connectivity characteristics to the application rather than simply maximizing speed.
Wi-Fi 6 and 6E improve efficiency, device density and power management. Wi-Fi 7 adds Multi-Link Operation for more reliable and responsive connectivity, while Wi-Fi HaLow extends the Wi-Fi ecosystem into long-range, low-power applications. Wi-Fi 8 is expected to push this development further by making ultra-high reliability a central design objective.
This creates a broader toolbox for IoT deployments. A battery-powered sensor, an industrial control system, an edge-AI application and a long-range monitoring device have fundamentally different connectivity requirements.
The key question is therefore no longer simply how fast Wi-Fi can become, but how effectively it can balance range, power consumption, device density, latency, reliability, security and interoperability for each IoT application.
Source: Shirin Bahar, A Review of Wi-Fi Evolution from Wi-Fi 4 to Wi-Fi 7 and Its Implications for Internet of Things Connectivity, International Journal of Leading Research Publication, Volume 7, Issue 8, August 2026.
Read the full review in the International Journal of Leading Research Publication: https://doi.org/10.70528/IJLRP.v7.i8.2321