Wi-Fi 7 Signals the Industry's New Priority: Stability
Multi-link operations and the 6-GHz band promise more reliability than before. From a report: The key to a future Wi-Fi you can depend on is something called multi-link operations (MLO). "It is the marquee feature of Wi-Fi 7," says Kevin Robinson, president and CEO of the Wi-Fi Alliance. MLO comes in two flavors. The first -- and simpler -- of the two is a version that allows Wi-Fi devices to spread a stream of data across multiple channels in a single frequency band. The technique makes the collective Wi-Fi signal more resilient to interference at a specific frequency. Where MLO really makes Wi-Fi 7 stand apart from previous generations, however, is a version that allows devices to spread a data stream across multiple frequency bands. For context, Wi-Fi utilizes three bands-2.5 gigahertz, 5 GHz, and as of 2020, 6 GHz. Whether MLO spreads signals across multiple channels in the same frequency band or channels across two or three bands, the goals are the same: dependability and reduced latency. Devices will be able to split up a stream of data and send portions across different channels at the same time -- which cuts down on the overall transmission time -- or beam copies of the data across diverse channels, in case one channel is noisy or otherwise impaired. MLO is hardly the only feature new to Wi-Fi 7, even if industry experts agree it's the most notable. Wi-Fi 7 will also see channel size increase from 160 megahertz to a new maximum of 320 MHz. Bigger channels means more throughput capacity, which means more data in the same amount of time. That said, 320-MHz channels won't be universally available. Wi-Fi uses unlicensed spectrum -- and in some regions, contiguous 320-MHz chunks of unlicensed spectrum don't exist because of other spectrum allocations. In cases where full channels aren't possible, Wi-Fi 7 includes another feature, called puncturing. "In the past, let's say you're looking for 320 MHz somewhere, but right within, there's a 20-MHz interferer. You would need to look at going to either side of that," says Andy Davidson, senior director of technology planning at Qualcomm. Before Wi-Fi 7, you'd functionally be stuck with about a 160-MHz channel either above or below that interference.
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