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[aprssig] Premptive Digipeating

PE1RDW aprs at pe1rdw.demon.nl
Fri Nov 30 22:46:23 UTC 2012


On Fri, 30 Nov 2012 23:37:08 +0100, Robert Bruninga <bruninga at usna.edu>  
wrote:


>
>> Also explicit chains will do repeats all over the place:
>> SRC>DST,NODE2,NODE3,NODE4
>
> Not really.  It can make at most 3 copies, and at least 1.  This is a  
> huge
> savings over even WIDE2-2 which can generate as many as from 4 to 16
> copies.  In fact, a 3 hop preemtive path above is even better than an
> explicit 3 hop path because it always generates 3 hops, whereas the
> Premptive will generate on average 1.5 hops.
>
only in a perfect world though, in practice the explicit 3 hop path will  
often get killed because of colisions from the hidden node effect while a  
preemtive path might actualy increase the change of reaching the  
destination so in number of dupes they could be equal depending on netwerk  
conditions, offcourse in achiving the goal preamtive works better.

-- 
73 Andre PE1RDW



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