[Atoca] FW: Requirement D2: "Large Audience"

<mark.wood@engineer.com> Mon, 17 January 2011 17:28 UTC

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Subject: [Atoca] FW: Requirement D2: "Large Audience"
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Yes, I stand corrected, Thanks Richard.

-----Original Message-----
From: Richard L. Barnes [mailto:rbarnes@bbn.com]
Sent: Monday, January 17, 2011 3:41 PM
To: Brian Rosen
Cc: <mark.wood@engineer.com>om>; earlywarning@ietf.org
Subject: Re: [Atoca] Requirement D2: "Large Audience"

Just one brief comment: Mark's statement that "it's only possible to have
any kind of delivery reports regarding specific terminals on a one-to-one
kind of unicast delivery" is not necessarily true.  The availability of
delivery reports depends entirely on the capabilities of the terminals, and
not the intervening access network.  In particular, terminals can send back
delivery reports regardless of whether they are sending or receiving over
broadcast or unicast.   

This pattern could actually be quite efficient in certain layer-2 networks
that have broadcast downstream, unicast upstream (e.g., PON, DSL, maybe
Cable IIRC).  A notification to an entire subnet takes one message, and all
acknowledgements can be received in parallel.