How to Make Wi-Fi Go Faster

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Welcome

My name is Keith Parsons

and I’m here to talk to you about

how to make your Wi-Fi go faster

how to make your Wi-Fi go faster

perhaps we should compare how we made Ethernet go

faster and whatever work there might

help us make our Wi-Fi go faster

well if we look back at the evolution of

cabling long time ago we used to have

Silversun that’s what we called it

it was flat cable it connected up telephones

it still had four conductors that ran copper

and then we went to twisted pair

the twist kind of help some of the things that

would happen when the cables were next to each

other little crosstalk going on

and we found that even with twisted pairs

there was still too much crosstalk too much

interference so we started to twist the pairs

individually nd then we

came up with Cat 3 cabling where we had some

very specific requirements that if we met

those requirements we could push one hundred meg

and then we want to go to Gig Ethernet

Gig Ethernet had higher specs for its

cable so we go to a Cat 5

now when we get 5 not only do the twists have to

happen but the twists have to go at different

ratios then we move to Cat 5

Cat 5 sorry Cat 6

now we’re on to Cat 7 and

as we went along this path

the copper didn’t change

the 100 meter length didn’t change

so what did we change that allowed us to go from

1-Meg Ethernet to Gig Ethernet

today we can push it up to 10 year definit if we

get the faster cable

copper didn’t change

didn’t change what we changed

was the interference

we lowered the interference

now for the specs for Cat 5 or Cat 6 cable

we have near side crosstalk far side crosstalk

and now twist ratios

how what’s the bend radius

there’s all sorts of very specific information

but they all fit in the category of we made the

interference go down which allowed us to

make the speed go up

hmmm I wonder what we might want to

do with Wi-Fi in order to make it go faster

you got it

reduce interference

now first before we go into all the ways we can

reduce interference what’s the number one thing

that causes interference in Wi-Fi

duh it’s the other Wi-Fi in fact

Wi-Fi protocol

802.11 protocol

specifically calls out that Wi-Fi is 100 times

more sensitive to other Wi-Fi than not

Wi-Fi I mean a lot of people when I ask this

question they talk about microwave ovens and

Bluetooth and other weird things going on

and yes they can cause interference

but had 100 times less signal strength

so we have a couple of ways to

judge and determine whether or not we have

something else going on the line

these are built into the protocols we have energy

protect and energy detect is

20 dB or 100 times less

sensitive than we have for preambles

detect and prevent

detect is what we use to see if another Wi-Fi is on

our system

so again the number one cause of interference in

Wi-Fi is other Wi-Fi

we control our own fate if we want to go fast

lower interference

I’ve shown this picture for

literally decades about how we

have want don’t want and don’t care

to want is what we want coming off of an AP

and it’s the target that we’d like to see perhaps

in this case we have NIC 67

NIC 67 is our target

the signal comes off the AP over space

it starts to degrade

now that’s called freespace loss

and you can go and study up on how that works

basically double the distance call the power and

you get this slowly dropping curve

but the signal doesn’t stop

it continues on and on and on

so what we want is whatever is above our

threshold in this case NIC 67 when it

goes down, down, down, down, it gets to a point

in this picture we’re showing it is negative 5

after negative 5 we can have our client

devices programed to ignore it

now depending on what client device how it’s

sensitive whether it’s in AP or a client

you can actually control this in some APs

the sensitivity of at what point am I going to ignore it

but below that level we don’t care

anymore so we have want above 67

we have don’t care below 85

what stuck in the middle

that’s our don’t want don’t want means

I don’t want

2 APs in this range at the same time because if a

client was sitting there

they would be having a difficulty

so let’s say I have a client associated to the green AP

he comes over here and he’s sitting about right here

he can hear the green AP he’s still associated now

he wanted to be at 67

but he walked out of the range

he still hasn’t roamed yet

so he can still hear the green AP

and so when this client right here at the arrow

transmits the green AP hears him

waits allows him to finish talking

but what does the gray AP do

the gray AP can hear him because he’s

above the gray NIC AP 5

so sitting right here in the middle

the client transmits

and in the frame that it transmits it says

Hello Mr. Green AP and it says the Mac address

the SSID of the AP it wants to talk to

the gray AP hears that and goes

not for me and he waits just like he’s supposed to

that’s the protocol only one device can ever transmit

it could be a client could be an AP but

only one at a time

so if this little black arrow right here is

transmitting the gray AP can’t transmit

nor can any of the clients associated to his AP

because the AP stopped and he’s listening

to the green client

want is what we want

that’s what we want to design for

don’t care

we don’t care

and if you’re using Ekahau you can actually set

this to show Gray so it matches

what’s going on in the picture

don’t want that’s how we make our FI go faster

we get rid of the don’t want zones because we

know only one device can ever transmit at a time

so if I can take these two apps and pull them far

enough apart that they’re not in the same zone

I can speed up my client because

they don’t have to talk that much now

what about each individual client

yet each individual client also has a little

zone around him where he can transmit and whenever

he transmits he’s the only one there and no one

else can use it as works for AP or works for

clients or works for everything

we want to go faster

do just like we did for Ethernet

lower interference

you’re the cause of it so you can fix it

I just threw this in here because it’s a great

little picture about R.F.

and just to show you a great picture

if you wanna learn more about wireless LANs

come to wireless LAN professionals

or the shortcut is WLANPros.com

join the community

we have lots of things going on there

you can come out listen to podcast

watch any of the WLPC videos and

tons of resources they’re free to use

thanks for being part of the community

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