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-   -   Why 802.11ac Will Kill The 5 GHz Wi-Fi Band (http://forums.smallnetbuilder.com/showthread.php?t=6811)

kk22 02-24-2012 01:05 PM

Why 802.11ac Will Kill The 5 GHz Wi-Fi Band
 
Reference:
[url]http://www.smallnetbuilder.com/wireless/wireless-features/31694-why-80211ac-will-kill-the-5-ghz-wi-fi-band/[/url]

That was an interesting piece. Thanks Tim.

[I]"The gist of all this is that 802.11ac, even in the first draft devices appearing this year, can reduce the effective number of available 5 GHz channels from nine to two!"[/I]

That's indeed a scary thought. I can already detect 30+ networks in the 2.4Ghz band in my townhouse complex neighborhood, with about 12 on Channel 1, 8 on Channel 6 and 7 on Channel 11, and a few using the in-between channels. The end result is my 2.4Ghz wireless N speeds aren't the best and there are times when the connection would drop.

I've since moved to the cleaner 5Ghz space and got more stability and speed for my laptops, but it looks like 802.11ac will make crowded neighborhoods a bigger nightmare for stable wireless connectivity.

Is there anything else in the works for wireless connectivity besides 802.11ac?

darksamus 02-24-2012 02:09 PM

[QUOTE=kk22;38236]Reference:
[url]http://www.smallnetbuilder.com/wireless/wireless-features/31694-why-80211ac-will-kill-the-5-ghz-wi-fi-band/[/url]

That was an interesting piece. Thanks Tim.

[I]"The gist of all this is that 802.11ac, even in the first draft devices appearing this year, can reduce the effective number of available 5 GHz channels from nine to two!"[/I]

That's indeed a scary thought. I can already detect 30+ networks in the 2.4Ghz band in my townhouse complex neighborhood, with about 12 on Channel 1, 8 on Channel 6 and 7 on Channel 11, and a few using the in-between channels. The end result is my 2.4Ghz wireless N speeds aren't the best and there are times when the connection would drop.

I've since moved to the cleaner 5Ghz space and got more stability and speed for my laptops, but it looks like 802.11ac will make crowded neighborhoods a bigger nightmare for stable wireless connectivity.

Is there anything else in the works for wireless connectivity besides 802.11ac?[/QUOTE]

Once all the vendors move to 802.11ac, the 2.4ghz will be back to less crowded!

One thing I don't like about this new standard or any wifi is that if you want higher bandwidth, you have to use 80mhz wide bandwidth and you know everyone is going to use it and it will start to overlap your neighbor's channels.

I forgot to mention that with new TVs that are going to be wifi enable from its base will be using 5ghz which means if your neighbors has that type of TV, you can bet that you will be able to pick up what they are watching.

thiggins 02-24-2012 02:12 PM

[quote=darksamus;38240]Once all the vendors move to 802.11ac, the 2.4ghz will be back to less crowded![/quote]Not likely. 11ac products will all be dual band, implementing bgn in 2.4 GHz.

thiggins 02-24-2012 02:13 PM

[quote=kk22;38236]Is there anything else in the works for wireless connectivity besides 802.11ac?[/quote]60 GHz technologies (WiGig and WirelessHD) are out there. But are short-range only.

irev210 02-24-2012 06:24 PM

I live in an urban environment and just fired up the latest version of inSSIDer.

In my apartment I pick up 133 access points.

87 at 2.4GHz (24 of them are a local university)
46 at 5GHz (35 of them are a local university)



Sad that 5GHz will become overcrowded.

RogerSC 02-24-2012 07:04 PM

Well, on the other hand, 5GHz. signals don't propagate nearly as well as 2.4GHz. signals. So I guess that the largest effects will be on people in apartment building. I see lots of 2.4GHz. networks, too, but I wouldn't expect to see more than one or two 5GHz. networks, from my immediate neighboring houses on either side of me. And not everyone jumps onto the new stuff, my immediate neighbor on one side of me, the strongest 2.4GHz. signal, is still using wireless-g with WEP *smile*. I'm guessing that at least they won't be jumping on the newest 5GHz. tech.

DaveMcLain 02-24-2012 09:37 PM

It appears that 11ac must take about an order of magnitude more processing power over 11n to implement so maybe it'll also have a lot more sophisticated "good neighbor" behavior when other networks are around competing for air time.

Great article Tim, thanks.

stevech 02-24-2012 10:24 PM

what we Don't need is more people with one-way over-powered WiFi routers/access points. That increases the radius of coverage, but only one-way... to the client.
The from-client radius of coverage is unchanged.

For those old enough to remember the hay-days of Citizen's Band Radio... we had too many people that used hundreds of watts. This and user behavior became so out of control that the US FCC abandoned licensing and managing use of the band. It more or less self destructed for all but the truckers who use it for quasi-valid reasons in this cell phone era.

My point is... if 2.4 then 5.8GHz are grossly misused, versus the original intent of low power, short range, SHARED-USE, then we all are impacted. The 40MHz mode of 11n is misuse, as it burdens 2/3 of the entire band. Not a problem if you are a light-use or rural user.

RogerSC 02-24-2012 10:54 PM

Yes Steve, I remember being bemused by the sales of massive linear amplifiers to CBer's. Really created an unusable zoo, but I guess it made the really loud guys happy. So it goes. Hopefully that "if a little is good, more is better" philosophy won't be carried into this arena.

thiggins 02-25-2012 11:14 AM

[quote=RogerSC;38264]Well, on the other hand, 5GHz. signals don't propagate nearly as well as 2.4GHz. signals.[/quote]Good point, which I forgot to include. I'll add it.

On the other hand, for enterprise use, with lots of APs, 80 MHz wide channels are going to make it more difficult for channel assignment.


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