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[aprssig] Improving Messaging and dytnamic Object management

Robert Bruninga bruninga at usna.edu
Sat Oct 24 01:37:21 UTC 2009


> A disadvantage, cost or liability, is that a 
> newcommer must wait to get the full picture.  
> ...  You have to wait for the data buffer to 
> fill with all the old (slowly updated) data.

Which is why the original APRS decay system decays only down to
the standard rate and no lower.  So do not think of it as
slowing the old data in any way.  Think of it as accelerating
the new data by an order of magnitude compared to other fixed
rate systems.

Bob, WB4APR

> 
> From: Robert Bruninga bruninga at usna.edu
> 
> 
> 	> This comment raises a question:  
> 	> Why is such aggressive transmitting (8s/16s/30s/60s = 
> average 30s interval) 
> 	> desirable for objects, but aggressive smart beaconing 
> for mobiles is anathema?  
> 	
> 	Good observation.  Not an anathema at all during an
event.  That
> 	is where Smart beaconing is PERFECT...  And that is also
an
> 	ideal place where the Decay algorithm has the same
advantage for
> 	objects.
> 	
> 	1) The original APRS Decay algorithm is required for any
> 	meaningful use of objects at an event.  This is so that
when
> 	anything is moved by an operator, everyone gets the
information
> 	very quickly due to the initial 8, 16, and 30  second
retries...
> 	but the older objects he moved or situated several
minutes ago
> 	are at longer periods to keep the overall load down.
> 	[...snip...]
> 
> 
> 




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