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Networking Demystified: Why Wi-Fi 6E is Sizzling and Why You Ought to Care


Aug 14, 2022
Networking Demystified: Why Wi-Fi 6E is Sizzling and Why You Ought to Care

Wi-Fi 6E is right here and the worldwide Wi-Fi group is buzzing about it. However why is it a significant change? What does it imply for folks’s Wi-Fi expertise and infrastructure distributors like Cisco? And why are Cisco engineers excited concerning the alternatives for innovation? Learn on to be taught concerning the particulars of 6E and the way this know-how transition can improve your profession too.

Wi-Fi 6E is Extra Than Simply “A Bit Extra Spectrum”

At its coronary heart, Wi-Fi 6E extends Wi-Fi to the 6 GHz band of the wi-fi spectrum. This may increasingly not sound very spectacular if you already know that Wi-Fi presently makes use of many different bands. Regulatory our bodies, just like the FCC within the US and ETSI within the European group, allocate to every radio know-how the suitable to transmit in segments of the spectrum and specify the allowed transmission traits, resembling most energy or the form and dimension of the sign. For instance:

  • Within the 2.4 GHz band, Wi-Fi is allowed over a bit extra of the 80 MHz of spectrum, with sometimes as much as 3 channels, every 20 MHz-wide.
  • Within the 5 GHz band, Wi-Fi is allowed over as much as 500 MHz of spectrum, which permits 25 20-MHz-wide channels. These channels could be configured to be bigger, 40 or 80 MHz, at the price of a decrease rely of potential non-overlapping channels—12 and 6 for 40 and 80 MHz respectively.

Bigger channels are sometimes most well-liked as a result of they permit the concurrent transmission of extra knowledge—very like a bigger water pipe carries extra water by unit of time—leading to greater capability and a greater expertise for bandwidth-intensive purposes like video and AR/VR.

Nevertheless, even with these choices, two neighboring Wi-Fi entry factors (APs) shouldn’t be on overlapping channels as a result of their alerts will collide except one AP waits for the opposite to complete transmitting earlier than commencing its personal transmission. This problem reduces the efficiency of the general system. In dense environments—like college lecture halls or enterprise convention rooms—there’s at all times a tough negotiation to be made between the necessity for extra APs to accommodate extra folks and their units by allocating them throughout many networking pipes, and the necessity to maximize the dimensions of every AP channel which, in flip, limits the variety of APs that may be within the vary of one another.

Within the US FCC area, Wi-Fi 6E provides 1200 MHz of latest spectrum, creating 59 20-MHz-wide channels, greater than tripling the variety of channels accessible. That is nice information for any Wi-Fi-dense deployment.

Even in domains the place the brand new allocation is narrower—for instance, in Europe with the ETSI area presently planning to allocate 500 MHz—the variety of channels accessible to Wi-Fi doubles. Which means that anywhere that had 40 MHz channels will quickly be capable of swap to 80 MHz channels, doubling the capability and enabling a 1080P video to be upscaled to 4K whereas sustaining the identical expertise.

New Band, New Guidelines

The 6 GHz band was in fact not ready for somebody to wish it. The 6 GHz house is in actual fact composed of 4 sub-bands, outlined as U-NII 5 to U-NII 8 within the US. All of them are already actively in use by mounted, outside units resembling ground-to-space satellite tv for pc providers and point-to-point microwave hyperlinks. U-NII6 and U-NII 8 are additionally utilized by cellular units—assume cable tv discipline vehicles sending video again to the principle station. Wi-Fi might want to share these spectrum areas and keep away from disrupting the incumbents. Because of this, the foundations for Wi-Fi units rely upon the sub-band the place they function.

6 GHz allocation in the US (FCC domain)
Determine 1. 6 GHz allocation within the US (FCC area)

In all 4 sub-bands, APs and purchasers can function at a low energy mode when situated inside buildings. Decrease energy means shorter transmission distances and thus smaller Wi-Fi cells, but in addition greater probabilities that one AP or Wi-Fi shopper is not going to hear one other unit effectively sufficient, inflicting packet losses or retries.

In two of the 4 sub-bands, APs and purchasers can function at greater energy—referred to as Customary Energy, with a max energy corresponding to Wi-Fi in a part of the 5 GHz band—provided that the APs first ensure that they don’t seem to be disrupting an incumbent transmitter. This verification isn’t potential in UNII-6 and UNII-8 as a result of, for instance, it’s tough to foretell the place TV vehicles might be at anybody time, so solely indoor and low energy are allowed in these circumstances. However in UNII-5 and UNII-7 bands, for any outside operation and any operation at customary energy, the AP should confirm at boot time, and ensure each 24 hours, that it isn’t broadcasting on a frequency utilized by a hard and fast incumbent. The AP runs this verification by offering its geographical location to a central server—the Automated Frequency Coordinator, or AFC—that returns the 6GHz frequencies allowed within the quick space. The utmost energy allowed for Low Energy Indoor (LPI) APs is half the max energy of Automated Frequency Coordination (AFC) APs. And since shopper units should function at half the ability of the APs, this energy puzzle creates attention-grabbing Wi-Fi cell design challenges.

Energy Spectral Density You Say?

The 6 GHz guidelines convey one other attention-grabbing twist. In 5 GHz and a pair of.4 GHz, the transmission guidelines are pushed by the notion of most Efficient Isotropic Radiated Energy (EIRP), which is the utmost amount of power emitted by a shopper or an AP. Because the max EIRP is mounted, a system that transmits over a 20-MHz channel transmits extra power per unit of frequency (per MHz) than a system that radiates the identical whole quantity of power, however over a wider channel, for instance, 80 MHz.

The concept is identical as a water hose. In case your hose delivers 1 liter per second, it should spray much less water per unit of floor in the event you unfold the jet as a flat 3-meter-wide mist than in the event you focus the water, energy washer fashion, over only a half sq. centimeter goal. A direct, and generally hidden consequence of this rule is that in the event you set your AP channel to a width of 80 MHz (as an alternative of 20 MHz), your cell dimension is mechanically decreased as a result of the quantity of sign accessible over every MHz of the channel at a given distance is now decrease. A typical solution to specific this discount is to say that the signal-to-noise ratio (SNR), over every MHz of frequency, reduces because the channel width will increase.

The Wi-Fi group expressed this concern when the 6 GHz allocation was being mentioned by worldwide regulatory our bodies. The good information is that the group was heard, and the foundations are totally different for six GHz band. On this new band, the max energy is now not a ‘whole max’ EIRP however is outlined as max Energy Spectral Density (PSD) or the max energy per MHz—within the hose analogy, that’s the water delivered per unit of floor. This restrict is per MHz and doesn’t change because the channel width adjustments. In follow, which means that a 6 GHz system can ship the identical quantity of power per MHz in an 80 MHz channel as it could in a 20 MHz channel, and subsequently that the cell dimension stays the identical, whatever the channel width. It simply sends extra whole power because the channel dimension will increase.

Power rule comparison between 5 GHz (left) and 6 GHz (right)
Determine 2. Energy rule comparability between 5 GHz (left) and 6 GHz (proper)

A New Golden Age for Wi-fi Engineering

One other thrilling property of the brand new 6 GHz band is that…effectively, it’s new. This may increasingly sound like a repeat, however what it actually means is that the trade doesn’t must design compatibility guidelines for older units.

Within the 5 GHz band, for instance, it’s your decision the advantages of all of the goodness of Wi-Fi 6, together with environment friendly scheduling, extraordinarily excessive throughput, and multi-user simultaneous transmissions, however your community may even see older Wi-Fi 5 units round and even older Wi-Fi 2 units from the early 2000s. These had been most likely already out of date 15 years in the past, however the mere proven fact that they might be there forces all later variations of Wi-Fi, together with Wi-Fi 6, to ship frames that may be partially understood by older units so they may detect transmissions and chorus from transmitting on the similar time.

This drawback doesn’t exist within the new band, so it may be optimized for optimum efficiency. The purchasers nonetheless have to find it, which once more brings many attention-grabbing challenges. For instance, scanning 25 channels in 5 GHz, then 59 extra in 6 GHz, doesn’t sound like a fantastic concept for quick roaming between APs. So, the invention mechanism has to have built-in intelligence. Equally, you could wish to maintain 6 GHz for environment friendly site visitors, resembling your Augmented Actuality purposes, and ship the much less pressing site visitors, like your background picture sync to the cloud, to the opposite bands. However this requires a intelligent trade mechanism between the shopper and the AP on assets availability, site visitors kind, and many others.

As you may see, there are a whole lot of alternatives to innovate and design wi-fi purchasers that may profit from new 6E alternatives.

Be a part of Cisco to Design the Way forward for Wi-Fi

At Cisco, we now have been on the forefront of Wi-Fi innovation for greater than twenty years. Constructing the way forward for Wi-Fi begins by designing nice entry factors, and good engines to optimize the expertise that wi-fi purchasers can acquire from optimized networks. Engineers working at Cisco take delight in designing the neatest AI-driven Radio Useful resource Administration engine in the marketplace to dynamically assign channels and energy ranges to neighboring APs. This creates clean steady Wi-Fi protection from small department networks to giant venues like Cell World Congress, the place 1500 APs and 75K+ simultaneous radio communication professionals count on nothing lower than an ideal Wi-Fi expertise. Different Cisco improvements embody OpenRoaming to automate onboarding, and Fastlane+ to optimize the expertise of your Apple iPhone and iPad in a Cisco Wi-Fi 6 community. The complete listing of Cisco wi-fi improvements would take a guide to enumerate. And with a brand-new 6E band accessible on our new entry factors, the alternatives to innovate are bounded solely by your creativeness and expertise.

Would you prefer to be a part of the Cisco Wi-Fi 6E journey, and assist invent the way forward for Wi-Fi?

There could also be a spot ready for you. Learn extra!

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