[Cerowrt-devel] [Make-wifi-fast] [tsvwg] Comments on draft-szigeti-tsvwg-ieee-802-11e

Mikael Abrahamsson swmike at swm.pp.se
Mon Aug 10 01:39:00 EDT 2015

On Sun, 9 Aug 2015, David Lang wrote:

> Just like wired networks benefit greatly from time-based queues rather 
> than packet count based queues, I think that wifi aggregation should not 
> be based on packet count (or even aggregate size) but rather the amont 
> of airtime that's going to be used (aggregate size * bit rate + 
> overhead)

I have been involved in 3GPP networking. In for instnace LTE, you can tune 
the scheduler to allocate resources in multiple ways, for instance so that 
each user gets similar amount of transfered data/second, or they get 
access to equal amount of "airtime resources" (which is called TTI 
(https://en.wikipedia.org/wiki/Transmission_Time_Interval), which is time 
slot and frequency divided in LTE (LTE has a lot of subcarriers (OFDM) and 
each subcarrier has 1ms TTIs)).

Personally I favor the "airtime resource fairness", becuase that means a 
station with bad connectivity doesn't harm a station with good 
connectivity. I think it's also intuitive to people that if they have bad 
radio conditions, their network performance goes down. If you give 
everybody the same speed even though some needs a lot more airtime 
resource to attain that speed, that person will never know they're hogging 
resources and will never try to improve the situation.

So if I understood you correctly above, my opinion is in agreement with 
what you wrote.

Mikael Abrahamsson    email: swmike at swm.pp.se

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