|reply to Guspaz |
Re: Caps should be outlawed !
said by Guspaz:Except 95th between 00:00 and 08:00 doesn't cost ISPs quite the same thing as 95th between 18:00 and 22:00 and once you get into those arguments, the idea of charging end-users 95th on a "fairness" basis falls apart even without considering the technical complexity.
The most fair way to bill traffic would be per megabit 95th percentile, since that's ultimately how the ISP gets billed.
An ISP that wanted to bill customers based on their individual contribution specifically to cost-driving peaks would have to log all their subscribers' usage on a per-X-minute basis, sort usage rows by global peaks and distribute bandwidth costs above baseline (expected average usage from typical subscribers included in base prices) based on how much of the global 90+th usage minutes each subscriber contributes to. This is feasible but would be somewhat computationally intensive and the "UBB" rate would vary from month to month depending on how many GBs billable peaks contain. There is no way to know the cost of GBs and how many of your GBs are billable (part of the global 90+th) until the month is over.
This would be a somewhat complex system but it would only bill people who participated in actual cost-driving peaks by using more than their "committed" (cap / sec_per_month) monthly average speed. However, spreading those costs on a relatively small subset (top-10% minutes) of global usage might yield somewhat steep rates.