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This is clear as mud. I have no clue what these percentages mean. I agree with ascom, I don't think you should put percentages! And if you do put them, what do they mean?
15-25% of dbm?
15-25% of total radio area served by one access point?

I tried to figure out how ascom came up with 2.5 db in their paper: http://www.ascom.com/ws/da/vowlan_myths.pdf

Using the free space calculation for 2.4 ghz, I can see how they come up with the assertion that 25% of distance is not a good thing.
Example: Free space loss at 2.4ghz at
.1 mile = 84.2 db
.36 mile = 95.33 db
.50 mile = 98.18 db
.75 mile = 101.71 db
1 mile = 104.2 db
Say your kickass 2.4 radio has a limit of 101.71 db, meaning it can pickup a signal at no farther than one mile. You want an overlap. So .75 mile is 25% of the distance of the radius, and so you may think that is good overlap? Well you are only giving an overlap of like they said, around 2.5 db. For an overlap of 10 db, it has to be around .36 mile. ?
thanks
Rod Deluhery
www.networksetup.com