Re: [STDS-802-11-TGM] Fine Timing Measurement (11-12/1249r4)

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Hi Mark,

If we use the 24 mbps rate, then the 3.8% result I have in the document becomes 300*3*(76us+84us+84us)/5s = 4.4%.

I think how frequently the STAs do this is an implementation parameter. In the example with 300 clients, a 5 seconds update makes sense given that you are not likely going to move very far in such a crowded space (e.g. concert, classroom, stadium).

Thanks

Carlos

From: Hamilton, Mark [Mark.Hamilton@xxxxxxxxxxxxxxx]
Sent: Thursday, January 17, 2013 9:40 AM
To: Aldana, Carlos; STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Cc: Dorothy Stanley <DStanley@xxxxxxxxxxxxxxxxx> (DStanley@xxxxxxxxxxxxxxxxx)
Subject: RE: Fine Timing Measurement (11-12/1249r4)

Hmm. I’d be inclined to use 24 (the highest, assured to be implemented, and generally seems to be reliably used, rate). But, okay, thanks for the explanation.

There’s also a difference in the number of APs used by each STA, although that is fractions of the problem.

The biggest difference is a question of how frequently STAs will do this. The really scary number in 11-13/72 comes from a 2 second rate, instead of 5 seconds.

Mark

From: Aldana, Carlos [mailto:caldana@xxxxxxxxxxxxxxxx]
Sent: Thursday, January 17, 2013 10:32 AM
To: Hamilton, Mark; STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Cc: Dorothy Stanley <DStanley@xxxxxxxxxxxxxxxxx> (DStanley@xxxxxxxxxxxxxxxxx)
Subject: RE: Fine Timing Measurement (11-12/1249r4)

Hi Mark,

The assumptions in 11-13/72 have a transmission data rate of ~6 mbps and my example has a data rate of 36 mbps.

Thanks

Carlos

From: Hamilton, Mark [mailto:Mark.Hamilton@xxxxxxxxxxxxxxx]
Sent: Thursday, January 17, 2013 8:04 AM
To: Aldana, Carlos; STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Cc: Dorothy Stanley <DStanley@xxxxxxxxxxxxxxxxx> (DStanley@xxxxxxxxxxxxxxxxx)
Subject: Fine Timing Measurement (11-12/1249r4)

Hi, Carlos, et al,

I see an updated 11-12/1249r4 on the server. Thanks for that – we are definitely getting closer!

One of my concerns is that your bandwidth overhead calculations have different assumptions than those in 11-13/72, with rather dramatically different results. Have the two sets of authors been able to get together and compare notes and come to some consensus on those assumptions?

Thanks. Mark

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