Re: [earlywarning] What problem is ATOCA trying to address?

On Mar 26, 2010, at 3:56 PM, DALY, BRIAN K (ATTCINW) wrote:

> Agree Art - Twitter is like SMS - no guarantee, unreliable, and prone to
> congestion. While in general it is good to try to get the message out as
> many ways as possible, at least one should be deemed "reliable".
> 
Sometimes reliability is the enemy of resilience. I would argue we're mostly shooting for the latter, and the former is often over-rated, especially if people start thinking it will work when needed and don't think more broadly, like maybe the cell tower just fell down.

That's why I think it's extremely short-sighted to try to "exempt" any particular device from the general IETF solution, and we should view the particular L2-specific mechanisms as optimizations to reduce load/congestion.

It also makes sense to view the cell-broadcast capability as an "underlay" for delivery of the more general Internet-generated and managed emergency alerts as opposed to some parallel and un-coordinated capability. 

Cheers, DaveO.

> Brian
> 
> -----Original Message-----
> From: earlywarning-bounces@ietf.org
> [mailto:earlywarning-bounces@ietf.org] On Behalf Of Art Botterell
> Sent: Friday, March 26, 2010 9:37 AM
> To: earlywarning@ietf.org
> Subject: Re: [earlywarning] What problem is ATOCA trying to address?
> 
> On Mar 26, 2010, at 3/26/10 9:14 AM, Henning Schulzrinne wrote:
>> And to bore everyone again with the same thing: In many cases,
> notifications are routinely sent to people outside a specific area or
> beyond a single network.
> 
> Which is why I thought it might be useful to reflect on WHY, after all
> these years, IP multicast has such limited scope, and on whether similar
> constraints might apply here.
> 
> Meanwhile, unicast approaches like Twitter rarely try to reach everyone
> on a particular local network, and they don't have any strict
> constraints on latency or even reliability, so I'd be cautious about
> assuming their suitability in emulation of a multicasting function.
> Anyone who's ever tried to text on New Year's Eve or Mother's Day should
> be able to relate.
> 
> - Art
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