[SensorNetArch] MIA Monday + Synopsis Diffusion

[Cheng Tien Ee]

All right. Btw, Scott and Ion will be away at HotNets next week.

I was thinking more about synopsis diffusion. I think an important part 
is the ability to extract information from a packet that is the 
compressed form of multiple downstream packets. I believe that to 
achieve better compression (i.e. not send more packets than the tree 
scheme) the authors sacrificed some amount of accuracy, in which case it 
still did better than the usual tree aggregation scheme. However, for 
applications that cannot tolerate information loss, or generate data 
with little correlation, less compression can be performed and it is not 
clear whether the resultant increase in # packets transmitted is acceptable.

Another point is that the authors assumed that the network is dense 
enough so that each mote has possibly multiple parent motes. It is 
possible that the network be sparse enough, so that we end up with the 
tree scheme anyway. In this case having retransmissions should increase 
the accuracy of counts.

The other point was brought up by Matt during the conference: there is 
an overhead of epoch maintenance and aging, so that data that isn't 
fresh anymore and that arrived at a later time can be ignored. I'm 
wondering if this sort of overhead is required regardless of the type of 
traffic (e.g. not periodic counting of motes). I guess there's probably 
some way of getting around it though.


Ee

David Culler wrote:

> Sounds like we are missing four.  Should we punt this week?
>
> Joe Polastre wrote:
>
>> Hi,
>>
>>   FYI, Jonathan and I will be meeting with the Demand Response group 
>> at 11am
>> Monday (their weekly meeting unfortunately is at the same time as ours)
>> since Ion and Scott will be out.
>>
>> -Joe
>>
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