6GHz Spectrum the Future of Wi-Fi

by | Sep 29, 2020 | Blog

6GHz Spectrum, The Future of Wi-Fi

In today’s training video, we were talking about the new 6GHz spectrum. 12000 megahertz of new channels for us, this is going to be the future of Wi-Fi.

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In today's training video, we were talking about

the new 6GHz spectrum

12000 megahertz of new channels for us,

this is going to be the future of Wi-Fi

In today's video, we'll talking about 6GHz spectrum

1200 megahertz of new channels for us

That is such a huge chunk

It's more than double what we had before

The future of Wi-Fi is in 6GHz

Like we've done in the other videos on the other bands,

we can look and compare the difference

between 2.4 bigger waves, 5 gig smaller

and then 6 gigs slightly smaller than that

They're smaller waves

It means a couple of things

One are antennas to have them tuned properly are tuned to

the frequency, which also means that the antennas

receive aperture the size of the radio wave

they're tuned to get

We'll collect more or less RF energy

So the 2.4 waves have a big circle and they collect, you know,

4.9 inches, 12 centimeters of sow worth of data

So when they are listening, those antennas hear more RSSI,

a lot more around 6dB differential

just because I have a bigger aperture

5 gig and 6 gig are fairly close

There's a slight difference between they're not nearly as much

as the difference being 2.4 and 5 gig

So a lot of times people say something that's totally wrong,

like 5 gig doesn't go as far as 2.4 and that's that's a total lie

2.4 and 5 go the exact same distance

If I have a radio that transmit the same power, the energy goes

the same way all the way to the moon,

all the way to Jupiter, all the way to Alpha Centauri

They both go the same distance

The difference is all about receive aperture

So if I have a 5GHz receive aperture that smaller,

it receives 6dB less energy than the 2.4

So what you should be saying is the 5GHz receive 6dB less at a

given distance than 2.4

The radio waves go the same, but there's less distance

because of the receive aperture

You can offset that by just increasing 6dB on the

transmit power of the 5 gig or taking the 2.4 down by 6dB

We can make them equal

We just need to understand how it works

Now, we can also look and see that 6GHz as

1200 wonderful megahertz of us to play with

Well, here's the issue

Depending on the country you're in,

you may or may not get all of this

And depending on the usage that you want for yours,

you may or may not get the same amount in the same number

So this shows this graphic is

By the way, this is done

Sorry, I'm a Excel guy

This is done in Excel

So all the little numbers inside are just formulas

And so it's a repeatable thing, you can go in and edit it

And so this is just showing us in this graph the difference

between FCC and ETSI EU

There's only two that we have data now

A couple other countries have already jumped on board and

coming fairly quickly

They have a codified those yet,

so I haven't added them to the chart

In between these two, there's a one that says standard power

The top one says low power,

the next one down says standard power

And even on the screen, even if you have a high def screen,

that's a lot of information to squeeze a pretty wide

So let's zoom in and look at these differently

First up, we're going to look at just the U.S. alone

What I've done is I've broken this big long 1200 megahertz

into two chunks

So they fit on the screen a little better,

but they they go together

So we have our U-NII 5, that's the ones in blue

U-NII 6 is and green, UNII 7 is in yellow and then kind of a

burnt orange or something for U-NII 8

This is the entire 6GHz spectrum

There is, by the way, if you look on the far left side,

there's a channel that is part of U-NII 4,

but it's not going to be a contiguous

We might win back that U-NII 4 in the 5GHz range,

but we won't have a contiguous

There's one that's missing there

So if you look there, you can see the radio band

center frequency and the 20 megahertz channels,

Like 59 of them

We have so much frequency available in 5 gig

for low power devices

Now, low power devices for us sounds like it's, you know

Low power, how low power, low power?

Well, for Wi-Fi in the 6 gig range, it's actually 18 dBm

That's really decent power

There's a lot of sites we've done and we don't even go up to

18 dBm in our transmit power

So low power is really mostly think, think indoors,

think what you're normally doing, you have 59 more channels

Now, one of the other issues that we have with the difference between 5 gig and 6 gig

In 5 gig, we measure off of EIRP

the effective isotropic radiator power

And so as we go to a wider channel from 20 to 40,

we lose 3 dB of SNR because we have a wider channel

More noise, the noise floor we hear 3 dB more noise

So my SNR drops

In the 6GHz range through the negotiations with the FCC

Instead of using EIRP, they use a term called Net EIRP,

which means it's going to be consistent

So if we went from a 40 to an 80, the rules allow the louder

transmit power so the net EIRP stays the same as we go

So the net is the 18 dBm, meaning we can actually,

as we go to wider, wider channels,

transmit a little louder to offset that noise differential,

meaning we can keep that 18 dB EIRP at 20, at 40, at 80,

which means there's no penalty for going to wider channels

And since we have so many of them, we can follow the rule,

which is use the widest channel you can until you can't

You can't is when you have code channel interference

Or if I have 20, yeah, 12, 40 megahertz channels

just in the U-NII, sorry my brain's here

If we have 12 just in the U-NII 5 alone

Well I can go without code channel interference

So what used to be 40s were pretty normal in 5 gig

We can now look at 80s will give us the same range

in the 6 gig range

So for the U.S. these are the rules

If you look at the second thing down, it's a standard AP power

This is not low power

Standard power in this case goes up to 36 dBm pretty loud

specifically for outdoors in order to protect the incumbents,

the people who are currently using the 6GHz range

The FCC did some negotiations and we came up with the

answer saying if you're in this range,

if you're in U-NII 6 or U-NII 7

You can't use all of the channels

the same way you used to be able to use them

So if you look down here, you say, oh,

U-NII 6 now, which we could have used in low power,

all these little channels 97, 101, 105

Yeah, we can't use this at all in U-NII 6, which also means the

U-NII 6 penalty of this Channel 113

Since we can't use that channel specifically, it means in U-NII 7

we lose our Channel 117 as well because it would have

bonded across that line

So we use, we lose the 40 and the 80 and the 160

So U-NII 7 is basically losing it from both sides because of the

fact we can't use U-NII 6 or U-NII 8

U-NII 5 is fine across the board

We're great there

If we're going to be using U-NII 6 or 7 or 8, we need to be

cognizant of that outdoor transmit power issue

We have a fewer channels to play with that

That's for the FCC in the U.S.

Let's look what's going on in the EU

That's what's going on, the FCC in the U.S.,

let's look back at the E.U.

And the E.U., and we'll zoom in here to just the E.U.

sanction chunk here

They're only picking up the U-NII 5,

U-NII 6, 7 and 8 is U.S. only

perhaps maybe after some additional negotiations,

other countries, other regions in the world will get those

But for the beginning, E.U.

is working on releasing the U-NII 5 band

Hey, there's still 24 new channels that's, you know, half

gigahertz of frequency for us to play with

Even in the E.U. are going to be looking at these

E.U. is only low powered, only for now, but it still has

lots and lots of capabilities

We talked about some of the issues in 6GHz today,

6GHz is going to be the future of Wi-Fi

I think it's great that we're moving that direction

If you need any more information, you know where to go

WLANPros.com, tons of information there

We love sharing with the community

Thanks for being part

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