Hello, everyone. I hope you are wondering welcome to the
section number four, which is related to Wi-Fi.
This is our first lecture of Wi-Fi section video
number 4.1 and we're going to discuss about our Wi-Fi
history how it works and the
topologies and the generations and
the use cases. So guys, let's get started with that.
So firstly we will talk about history in
1985 US Federal Communication Commission
released ISM ban for
general purpose to use these bands
without any license. So 2.5 gigahertz
is also included in that ISM band,
which is free of cost and in
1992 in Australia organization, which
is funded by Commonwealth scientific and
Industrial research organization set up
a test bed to develop our wireless local area
network in 2000. WiFi Alliance
came into existence, which is responsible for
its standard and future development. And the
IEEE standard for Wi-Fi is
8 or 2.11 and
in the survey of 2019 30 billion
Wi-Fi devices has been shipped into the market and
it is rapidly growing due
to other new technology.
Feet just like iot.
So now the question is how it works.
Now this picture is showing that there
is a central router or Gateway and the other
devices such as printer computer tablet and
mobile devices are connected to that Gateway
or you can say that router for the
communication.
So now let's discuss about the network topologies
actually WiFi sport a lot of different network
topologies. One of the famous Network topologies
the star which is also known as a client and
the Gateway or you can say that server node
topology in that scenario.
We have a 1 Gateway and although the device that connected to
that Gateway for the communication and the second and
one of the famous topology is a
mesh Network which is used by researchers in different scenarios, like
in smart agriculture or like in a
wsn wireless sensor networks, and the
third topology is the P2P in
case
Two guys are sitting and they want to exchange the
data with each other, but they didn't have access to
Wi-Fi router or Gateway. So what
they do is they do set up the P2P.
Wi-Fi network to communicate with each other
And next is the cluster tree topology, which is the combination
of star and the mesh Network which is
used on the different scenarios. Like
we have a start apology but
we have a limited range. So what we do is we set
up some sort of mesh Network to extend
the other network by this method and
the last one is the self organizing technology, which
is used in the disaster scenarios.
For example, there's earthquake
or some sort of a flood
and people didn't have access to their routers or Gateway.
So this is a self-organizing topology which connects
the devices with each other to make a bigger Network.
So this is the table of specification and right
now we have Wi-Fi 7 which is
available in 2024 to the
users. But still we guys we
are using Wi-Fi 4 Wi-Fi and Wi-Fi 6
and if we talk about the data rates, which is
significantly increasing in the latest versions. And
by the way, Wi-Fi 5 is
also using 5 gigahertz band
and Wi-Fi 4 is also using but there's
a significant increase in
the data transfer rates.
Which has been considered in the Wi-Fi and Wi-Fi
6 and if we talk about the Wi-Fi 7 and 6E,
they both are using the six gigahertz.
That's why still these two variants are under
research and under regulation not available
in the market and hopefully they will be launched
in the 2024 that due to some regulation.
That's why they stop are you guys can compare
the other generations with each
other to get know about one more thing is that we
can see is a b g and a
c a x b on our wireless gateways
or routers on the
boxes that they mentioned that witches. So these
are the standards actually which is defining that
which is Wi-Fi 3 and which is Wi-Fi to and which
is Wi-Fi one. So if we talk about the AC,
it's CO2 or 11 AC. It
is known as Wi-Fi.
So these are some things that we need to understand before
by chasing any Gateway. And one
more thing is that the data rate is in
m-bit megabit. Not Mega byte.
Some guys get confused by the MB.
So there is a small B in mb because
it's a wireless network communication.
So now it's time to talk about the applications and
we have a wide variety of use cases where we
can use the Wi-Fi. So in
Smart Homes, right actually right now, we're
just talking about what the use cases are in iot. So
specifically smart home is a bigger market for
Wi-Fi consumption smart buildings and
smart cities and medical. Okay, let's
discuss some Medical in the previous section.
We discuss that we are
using ble in medical and sports equipment actually
ble.
Is embedded into the small gadgets
we are able gadgets because they consume less power.
So it is good to embed in a
Small widgets variable widgets but Wi-Fi is
used in different equipments like Wi-Fi enabled
ECG machine a bigger machine that you can see
in a hospital or you can say that other nodes
which have
a bigger functionality and need a bigger power as compared to
ble. So these are
the use cases in medical in smart agriculture. We use
the Wi-Fi as a node as
well as a Gateway so we can
also set up a mesh Network WiFi mesh Network and the
way famous device which introduce the
Wi-Fi in iot devices is esp826 series
or you can say that ESP series because it have a different variants
like espa to level six esp32 series. And
of course in industrial iot, this
is a bigger potential field to use
Wi-Fi in their Hardware to
communicate with other devices as well as with
Loud, so Guys, these are the use cases regarding Wi-Fi and
the iot.
In the next video. We are going to set up a esp32 hotspot,
which is going to be very interesting. So guys
see you in our next video. Have a good day. Bye.