Well, this is an interesting challenge and it really is trying to bring all of
these concepts
of RF and channels and bands and try to turn it into a wireless networking
conversation
because at the end of the day we have to be able to deploy access points and
set the channels
and make sure that we don't have interference inside of our environment.
And so when we look at a building like this, I mean this would probably be a
four plan
that has rooms in here and hallways and all kinds of things, but we're just WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
that has rooms in here and hallways and all kinds of things, but we're just
going to keep
it simple, say that we've got this physical space, we have seven different
access points
and we see the cells that are defined by each AP.
Now if the access points transmit powers turned up, it's going to be a lot
larger.
We've got maybe some smaller cells in here.
Maybe the access point isn't communicating quite as strongly as the others and
so that
will happen in real world as well where we'll have different sizes of cells.
So our job is to take these four channels that we were given and create a non- WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So our job is to take these four channels that we were given and create a non-
overlapping
design by using them.
Now notice we were given six different channels and we have seven different
cells here.
So I'd say, well wait a second, how do I do this?
I'm going to have to reuse one of them.
Well believe it or not, we can reuse these as many times as we want so long as
the cells
aren't overlapping.
And so this access point here and this access point up here and this access
point down
here could all in theory use the same channel because there's a gap that exists
among all WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
three of these.
They could all use channel 36, the first one in our list if we so desire.
And so when we're making a plan here, we probably want to say, well let's just
start with the
first one again.
We'll say, hey I'm going to make this channel 36 and then I could make this one
down here
channel 40 and then I come in here to the middle and I say, all right this is
going
to be channel 108.
Now I could keep going, I could say this is channel 112 except notice that
these two are really
far apart and so I could go back to channel 40 here. WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
far apart and so I could go back to channel 40 here.
And then I could say that, all right well 108 and 40, well these two are far
apart as well
and so I could make this channel 36 again.
And then hey, well might as well keep it up, I could go to channel 108 over
here and channel
40 down here.
So I just made a non overlapping design using three channels and this is
actually what we
used to do when we had our 2.4 gigahertz as our only space, we only had three WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
used to do when we had our 2.4 gigahertz as our only space, we only had three
non overlapping
channels.
And so we always had to be a little bit more willing to or I guess creative
maybe at times
to make sure that our channels and our cells were tuned in such a way that we
could get
through this with only three.
Now is that necessarily optimal if we have more channels available?
Well maybe not because even though we said that these three are all on 40, yeah
there's
a little bit of a gap here and a gap here but are we really sure that that's WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
a little bit of a gap here and a gap here but are we really sure that that's
where the
wireless communications end?
What if there is a little bit of overlap here?
And so if we only had three channels available we might stick with that.
But if we have more channels available which we do today here in this challenge
then we
might as well use them.
So let's go ahead and do this with more channels.
Well let's start with 36 again in 40 and 108 but now again because we have six
channels
I might as well go to 112 here, 132 here, 136 and then I am out of channels. WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
I might as well go to 112 here, 132 here, 136 and then I am out of channels.
Well here's the good news.
This access point here is as far away as it gets from the access point in the
upper left
so I would just assign this to channel 36 again.
That is how we might want to go about doing this if we're talking about being
very safe.
Now lastly interestingly might notice that we could have bonded these channels
together
as well.
36 and 40 are adjacent to one another. WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
36 and 40 are adjacent to one another.
108 and 112 are adjacent.
132 and 136 are adjacent to one another as well.
Now we didn't exactly specify that they're adjacent.
So if this is what you did with non bonded channels then that's perfectly fine.
And again there's really a lot of writing answers to how to go about doing this
.
But what if we wanted to bond these channels together and use them to create a
diagram that
is not overlapping.
Well I could put 36 and 40 together here and that would be again a 40 megahertz WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
Well I could put 36 and 40 together here and that would be again a 40 megahertz
channel
now.
But 108 and 112 down here and I could do 132 and 136 here in the middle.
And just like with our original three channel design we're going to do the same
concept because
we effectively have three channels.
There are three different 40 megahertz channels.
So I'll make this one 108, 112 as well since it's as far away as it can be from WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So I'll make this one 108, 112 as well since it's as far away as it can be from
that one
or the furthest away from that one.
I'll make this one a 3640.
I'll make this a 132, 136 and I'll make this one down here a 108, 112.
We might still see a little bit of interference from some of the nearby cells
here and so we'd
have to be careful with this design.
But it is certainly an option for us to consider as far as deploying 40 mega
hertz channels
this have 20 megahertz channels.
So again however you ended up doing this challenge perfectly fine if you did WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
So again however you ended up doing this challenge perfectly fine if you did
the first one where
you only use three if you did the middle one where you just spread them all out
and hey if
you did happen to do it with bonded channels then great.
But the main purpose of this conversation and this challenge is to make sure
that we understand
we need to pick a channel.
We need to assign our access points to use those channel or that channel and we
need to make
sure that while our cells should overlap we do want overlap between ourselves
as we said
that helps with seamless wireless roaming.
We do not want to see overlap between cells that have the same channel assigned WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:900000
We do not want to see overlap between cells that have the same channel assigned
.
I hope there's been informative for you and I'd like to thank you for viewing.