WiFi 6 promised so much, and before we’ve even truly discovered all it can do, WiFi 7 arrives at our door. Phil Tann explores all that the next generation of WiFi can achieve and what it means for integrators.

The world of wireless connectivity is perpetually evolving, pushing the boundaries of speed, efficiency and capacity. Just as we’ve settled into the significant advancements offered by WiFi 6 and 6E, the next generation, WiFi 7 (officially known as IEEE 802.11be and dubbed Extremely High Throughput or EHT), is already here, promising a transformative leap in our digital experiences.

For the past 12 months, I have been running WiFi 7 in my home office and will discuss the key differences between WiFi 7 and its predecessors, explore the myriad benefits it offers to users and address some of the inherent downsides, particularly concerning signal penetration from the base station and practical limitations.

From WiFi 6 to WiFi 7: A generational leap

To truly appreciate WiFi 7, it’s essential to understand what came before it. WiFi 6 (802.11ax) focuses on improving efficiency and performance in dense environments, largely through technologies such as orthogonal frequency-division multiple access (OFDMA) and enhanced multi-user, multiple input, multiple output (MU-MIMO). WiFi 6E expanded upon this by opening up the 6GHz band, providing a vast, clean spectrum free from the congestion of older 2.4GHz and 5GHz bands.

WiFi 7 takes these foundational improvements and amplifies them significantly, while also introducing groundbreaking new features.

WiFi 7 technology represents a significant leap forward in wireless connectivity, primarily distinguished by its blazing-fast speeds. Boasting theoretical maximum speeds of up to 46Gbps, it dramatically surpasses WiFi 6’s 9.6Gbps, a monumental increase attributed to several key advancements. One major factor is the introduction of wider channels, doubling the maximum channel width from 160MHz in WiFi 6/6E to a more throughput-friendly 320MHz, primarily within the 6GHz band.

This expansion allows for the simultaneous transmission of more data, akin to widening a highway to accommodate more traffic. Furthermore, WiFi 7 incorporates 4096-QAM (4K-QAM), an advanced modulation scheme that enables each signal to carry 12 bits of data, a 20% increase over WiFi 6’s 1024-QAM (10 bits per symbol). This higher data density efficiently packs more information into each transmission, leading to significantly higher peak rates. Finally, the technology enhances spatial multiplexing by increasing the number of spatial streams from WiFi 6’s 8 to 16, further boosting theoretical throughput and overall network capacity.

Multi-link operation (MLO) is arguably the most significant architectural change in WiFi 7, fundamentally transforming how devices connect. Unlike previous WiFi generations, where devices could only utilise a single frequency band (2.4GHz, 5GHz or 6GHz) at a time, MLO allows WiFi 7 devices to simultaneously transmit and receive data across multiple frequency bands and channels. This can be likened to your device having multiple internet connections active at once, seamlessly aggregating bandwidth or intelligently switching between them to optimise performance. This capability dramatically improves reliability by offering redundant paths for data, significantly reduces latency by avoiding congested links and greatly enhances overall throughput, especially in dense and congested wireless environments.

MLO achieves these benefits through different operating modes. For instance, simultaneous transmit and receive (STR) mode enables devices to send and receive data on different bands concurrently, providing a substantial boost in real-time performance. Conversely, the non-simultaneous transmit and receive (NSTR) mode, while not offering simultaneous operation, still enhances efficiency by coordinating transmissions across multiple links to avoid interference and improve reliability.

The underlying mechanism involves a multi-link device (MLD), which can intelligently leverage multiple “affiliated” links to the upper logical link control (LLC) layer for concurrent data transmission and reception. This can manifest as link aggregation, combining the bandwidth of multiple links for higher speeds, or link redundancy/failover, sending duplicate data across links to ensure delivery even if one link experiences interference. It’s crucial to understand that for MLO to function, both the WiFi 7 router (access point) and the client device (such as a smartphone or laptop) must fully support WiFi 7 and its MLO capabilities.

In previous WiFi standards, if a portion of a wide channel was affected by interference, the entire channel would become unusable. WiFi 7 introduces “preamble puncturing,” which allows the system to identify and block off only the noisy, unusable parts of a channel, while continuing to utilise the remaining clean spectrum. This intelligent allocation maximises spectrum efficiency and ensures consistent performance even in the presence of interference.

While OFDMA was introduced in WiFi 6 to efficiently divide a channel’s frequency into smaller resource units (RUs) for multiple users, WiFi 7 significantly refines this with multiple resource units (MRUs). This crucial enhancement allows a single user to be allocated not just one, but multiple non-contiguous resource units within a channel. This leads to far better spectrum utilisation and reduces competition for bandwidth, particularly beneficial in networks with many connected devices, as it allows for more flexible and precise allocation of bandwidth to individual users based on their specific needs.

Complementing this, WiFi 7 also introduces semi-simultaneous bidirectional MU-MIMO. Unlike previous versions, where MU-MIMO was primarily one-directional (downlink, from router to device), WiFi 7 enables client devices to transmit data back to the router (uplink) in a semi-simultaneous fashion. While not full duplex, this coordinated uplink and downlink transmission significantly improves efficiency and responsiveness, further enhancing overall network performance for both sending and receiving data across multiple users.

All of these advancements culminate in significantly reduced latency. WiFi 7 aims for sub-millisecond latency, a critical factor for real-time applications.

Elevating the user experience

The technical advancements of WiFi 7 translate directly into tangible benefits for everyday users, fundamentally changing how we interact with our connected world.

WiFi 7 ushers in an era of unprecedented speed and reliability, fundamentally transforming our digital experiences. With theoretical speeds reaching tens of gigabits per second, mundane tasks like downloading massive game files, 4K/8K movies or large work documents will become near instantaneous. The frustration of buffering will truly become a relic of the past, even when multiple high-bandwidth streams are active simultaneously across the network.

For gamers, WiFi 7 is a game-changer (pun intended). The significantly lower latency and remarkably higher speeds translate into virtually no lag, ensuring instantaneous response times that deliver a ‘wired-like’ experience for online multiplayer and cloud gaming. This provides a clear competitive edge and promises a far more enjoyable and immersive gaming session, even when other devices on the network are actively consuming bandwidth.

Furthermore, WiFi 7 is set to revolutionise augmented reality (AR) and virtual reality (VR). These demanding applications require incredibly low latency and exceptionally high bandwidth to deliver truly immersive experiences without causing motion sickness or visual stutter. WiFi 7’s advanced capabilities are perfectly aligned with these stringent requirements, enabling smoother, more realistic virtual worlds and fostering real-time interactions that genuinely blur the lines between the physical and digital realms.

In our increasingly connected lives, WiFi 7 also ensures seamless smart homes. As our residences become ever more saturated with smart devices (ranging from security cameras and smart thermostats to intelligent appliances and voice assistants), WiFi 7 provides the robust and resilient backbone needed to effortlessly manage this ever-growing ecosystem. Its significantly increased capacity and enhanced efficiency guarantee that every single device receives a stable and consistently fast connection, effectively eliminating frustrating slowdowns and disruptive disconnections, even in the most device-heavy households.

Finally, the technology will dramatically enhance video conferencing and remote work/education. The soaring demand for high-quality video conferencing, especially in today’s hybrid world, necessitates robust connectivity. WiFi 7’s notably reduced latency and increased bandwidth will ensure crystal-clear video calls, facilitate seamless screen sharing and establish consistently reliable connections for all remote work and online learning scenarios, even with multiple participants and high-resolution content being shared simultaneously.

The inherent downsides: Cost and signal loss

Despite its impressive advancements, WiFi 7 is not without its limitations, particularly concerning signal propagation and practical implementation in real-world environments.

WiFi 7’s advanced capabilities are heavily reliant on the 6GHz band, which offers significantly wider channels and higher speeds. However, these benefits come with inherent physical limitations. The physics of higher frequencies dictates that they generally have shorter ranges and are more susceptible to obstruction. This means that materials like concrete, brick and even dense furniture can act as significant barriers to WiFi signals, especially at 6GHz. The more obstacles between your WiFi 7 router and your device, the weaker the signal will become.

Consequently, the 6GHz signal will likely struggle with thick internal walls and may be largely confined to the same room or an adjacent one.

While WiFi 7 does utilise the 2.4GHz and 5GHz bands through MLO for better penetration, these bands do not deliver the same extreme speeds. Therefore, to fully experience WiFi 7’s highest speeds throughout a multi-room or multi-story home or business, investing in a mesh WiFi 7 system or strategically placing multiple access points will likely be necessary.

Beyond the physical considerations, device compatibility is crucial to fully harness WiFi 7’s power. For a truly transformative experience, both your router and all your client devices (such as smartphones, laptops, tablets and smart TVs) must support the WiFi 7 standard. While WiFi 7 is designed to be backward compatible with older WiFi standards, older devices will not be able to leverage the new features and speed enhancements. This necessitates an initial investment in new hardware to unlock the full potential of the technology.

As with any top-of-the-line technology, cost is another significant factor to consider. Early adoption of WiFi 7 will naturally come with a higher price tag for both routers and compatible devices. This cost is already beginning to decrease and will continue to do so over time as the technology becomes more widespread and production scales up.

In brutal honesty, for many users, WiFi 7’s extreme speeds might be overkill. Individuals with basic internet needs, such as web browsing, email and light streaming, may find their existing WiFi 6 or even WiFi 5 setups perfectly adequate, making the upgrade cost difficult to justify.

The true value of WiFi 7 shines brightest for power users, gamers, AR/VR enthusiasts and those with a high density of connected devices, such as businesses, community hubs and sporting clubs, that can genuinely benefit from the substantial increase in bandwidth and reduced latency.

A glimpse into the hyper-connected future

WiFi 7 marks a significant leap forward in wireless communication, promising an era of “extremely high throughput” that will fundamentally reshape our digital lives. Its ability to deliver unprecedented speeds, drastically reduce latency and manage a multitude of devices with greater efficiency sets the stage for a hyper-connected future.

While the challenges of signal penetration, particularly for the high frequency 6GHz band, remain a practical consideration, innovations like MLO and flexible channel utilisation are designed to mitigate these issues and ensure a more robust and reliable connection.

For those pushing the boundaries of what’s possible with wireless technology – from professional gamers and VR enthusiasts to smart home innovators and businesses relying on real-time data – WiFi 7 is not just an upgrade; it’s an essential enabler of the next generation of digital experiences.

While it may not be immediately necessary, investing in WiFi 7 now is a smart move for future-proofing your network. While current internet service provider speeds in Australia and globally might not fully utilise WiFi 7’s peak capabilities, adopting WiFi 7 prepare your home or office for the inevitable proliferation of even faster multi-gigabit internet plans and the increasing demands of future applications.

As the ecosystem of WiFi 7-compatible devices expands and prices become more accessible, we can expect this powerful new standard to become the bedrock of our increasingly connected world.