[Tinyos-devel] Re: 2.0.2 CC2420

[Philip Levis]

On Jul 5, 2007, at 11:18 AM, David Moss wrote:

>
>> I don't mind doing the characterization, since after all I'm one  
>> of the
>> people pushing for the change.  I've got a small 10 mote test bed
>> currently on idle, if that seems like it would suffice.  Any  
>> suggestions
>> on specs or stats?
>
> Phil had access to acknowledgement stats before.  Phil - do you have
> suggestions on how this should proceed?
> -David
>
>

This is the link to Jung Il's study:

http://sing.stanford.edu:8081/JungilChoi/FWP/FWP_packet_acknowledgements

Please note that it was for a modified version of the MAC, and so the  
timing values (TX rate) may differ from the standard TinyOS ones.

Jung Il can provide greater details, but essentially he compared the  
ACK success rate and transmit rate to using his SACKs and using the  
standard AUTOACKs in Jonathan Hui's original stack. He measured  
different payload lengths due to the effect they have on the SACK  
latency sensitivity. If you read the whole packet before SACKing,  
then long packets hurt you; if you only read the header before  
SACKing, then short packets hurt you. These results were for his  
approach of SACKing after the destination address.

Phil