Re: Zero rating implentation strategies

[Christian Kuhtz <chkuhtz () microsoft com>]

Inline..

On Sep 1, 2015, at 10:13 AM, Jean-Francois Mezei <jfmezei_nanog () vaxination ca<mailto:jfmezei_nanog () vaxination 
ca>> wrote:

On 15-09-01 12:36, Christian Kuhtz wrote:

Zero rating is not a new concept. It has existed in the mobile world since the days of the dumb phone.

Yes, but is now in a different scale and when you start to zero rate
content that comes from CDN (aka: many IPs which may also serve non zero
rated content).

I don't agree with that assertion.  Not a new concept. I worked on stuff like that over a decade ago, with multiple CDN 
providers.   Wasn't even mobile, it was for DSL.

There are scaling issues if the idea was out of touch with how interwebs actually work.  Only in those cases might it 
have technically worked but priced itself out of reality.  But there wasn't anything fundamentally to say it couldn't 
be done.

CDN's have for a very long time had ways to implement custom mappings and tweak their algorithms to source specific 
content to a specific subscriber in a very specific way or place source nodes in particular locations (logically or 
physically).  They only varied in their ability or willingness to do so on terms that might seem reasonable to a given 
partner (which generally means you either do or don't come to terms on contracts).  It wasn't a fundamental technical 
barrier even 10-15 yrs ago.

Got a reference to why this was killed by the regulator in Canada?

Bell Mobility zero rating its own MobileTV offering was decided in
January 2015 by CRTC:

Thank you. The key here appears to be this:

Subsection 27(2) prohibits Canadian carriers from
conferring an undue disadvantage to others, or an undue preference to
itself or others.

So this appears to be about distorting the competition between their own services and third parties rather than about 
zero rating per se.

Mobile networks typically use their packet core (and prior iterations of the same termination, rating, billing, 
management gear) to rate and bill specific to each subscriber.  It is done with voice minutes, text, data.  Whether or 
not you consider the solutions scalable is up to one's individual judgement. But this zero rating billing model has and 
is very widely deployed and at massive scale. In fact, there are specific interfaces defined for just these purposes in 
the applicable standards.  There are many many conceivable ways in which billing mediation and associated 
infrastructure for zero rating can and is implemented. This is not new and is very well understood in the mobile 
industry.

Not sure what you're after here.

What I am after is what sort of logic is used to determine whether a
packet is to be counted towards total monthly usage or not.  Is it based
on sourse IP address ?  DPI equipment looking at content ? And more
importantly, if it is possible to zero rate any flow that is below a
certain speed. (whether from a radio station or some heart monitor).

All of the above and more.  Depends on content. For example, if you obtain the knowledge of origin and subscriber, you 
have what is needed. Origin should not be constrained to origin in terms of IP address space or port numbers. It can be 
marked in the protocol header, content, sourced from specific interfaces etc etc. The ways are pretty endless and the 
gear is readily available. There is an entire cottage industry peddling this stuff from sourcing, detection through 
rating and billing in addition to the major equipment vendors.

There are no inherent limits. You can do it with or without DPI. You can do it with or without subscriber management 
systems (like BRAS). You can do it with or without knowledge of source or destination IP addresses. You can do it with 
any kind of content. You can do it with or without flow awareness.  You can do it with or without special protocol 
semantics.

What is capable is (as always) up to the engineering clue, business savvy and business model supporting the 
implementation.  And I really mean anything can, has, and will be brought to life at scale given a suitable business 
cause.

I don't mean to be obnoxious. The question is a bit like asking if interwebs have limits ;-).. Yes, there are stupid 
ways to screw things up, but there is a huge variety of ways to make it work and make money doing it. And without 
pissing off regulators.  There is no red flag from a regulatory perspective based on the technology itself in my 
opinion.

Hope this helps.

Best regards,
Christian