On Dec 12, 2007, at 9:07 AM, Timothy J. Salo wrote:
This is not true. A node that sleeps can receive broadcast
packets. - If the broadcast packet is transmitted on some
schedule then the
sleeping node can wake up on that schedule and receive the packet.
- If the broadcast packet is transmitted with some sort of long
preamble then the sleeping node can wake up on it's own schedule,
over
hear the preamble and stay awake to receive the packet.
- If the broadcast packet is transmitted multiple times the
sleeping
node can wake up during one of these transmissions and receive the
packet.
All you have said is that a sleeping node can receive if
it isn't sleeping. I don't think that this sort of "Black is
white, (as long as it changes color)" answer does much to advance
the discussion at hand.
Geoff's point is that while the nodes sleep, you schedule and
structure communication such that this does not prevent receiving
packets. Numerous products, protocols, and systems have shown you can
achieve very low duty cycles while still maintaining connectivity.
Phil
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