Wireless congestion in Wireless network

[palani2010]

Wireless congestion in Wireless network.

Can someone explain me in simple terms ?

[Leo Laohoo]

One (or more) wireless clients spamming the airwaves.

[liviu.gheorghe]

Two or more wireless clients trying to transmit on the same channel/frequency.

[tobies]

In each coverage area, only one device per channel can transmit information/data at once (leaving BSS coloring, MU-MIMO aside). All other devices have to wait for this one to finish. After that, there's mechanisms in place to elect the next device which is allowed to send (CSMA/CA). If there are many devices on that channel trying to transmit, you speak of a "high channel congestion".

[Flavio Miranda]

@palani2010 

 A meeting room with "n"  people trying  to talk at the same time.

[Haydn Andrews]

With WIFI only one client or AP can talk on the same channel at the same time. If there are too many clients all wanting to talk then they cant get access to the medium and you have congestion.

Think of a meeting on zoom, if everyone tries to talk at once no one can. understand, so the rule of must put your hand up before being allowed to ask question. This works well if there are only a few people on call. 

Now if you put 1000s of people on the call and everyone puts there hand up users cant ask there question for ages

this is congestion.

But there are other factors also in play, if there are non wifi devices operating on the same frequency or channels that overlap with the one your on they also add to the congestion.

So this is why we design the AP to have overlaping coverage but keep their cell sizes small and use things like RRM to plan the channel separations

[JPavonM]

Imagine a classroom full of students all trying to talk at the same time, or a bar with lot of people and small groups of people chatting at the same time, that is congestion and co-channel interferencee, where no conversation at all can be fully distinguished.