[Tinyos-devel] [Tinyos-help] Collection: Loosing Connection to a Node

[Roman Lim]

Philip Levis wrote:
> 
> On Apr 29, 2008, at 3:39 AM, Bulut ERSAVAS wrote:
>> Hi David & Roman,
>>
>> Thanks for your comments. I would be really interested in trying 
>> Roman's workaround. Roman, would you mind sharing it with us?
>>
>> Phil & Omprakash,
>>
>> Considering these comments, what kind of action plan do you have in 
>> mind to make LPL & CTP work together? Will net2 wg own the case? We (a 
>> team of 3 EE & CS at Bosphorus University, Istanbul) are ready to 
>> provide support in testing and any other aspect you see appropriate.
>>
>> Looking forward to hearing from you.
> 
> The CC2420 stack lives in the core WG, while CTP, etc., live in net2.
> 
> The best thing you can do is generate CTP traces using LPL that let us 
> see what happens. We can also generate traces for testbeds we know well, 
> but the more diverse the set of environments that we test protocols in, 
> the more problematic edge cases we can find and deal with. The important 
> thing is to be sure to use the most current code in CVS; Om just checked 
> in the changes that reduce the control traffic rate.
> 
> Roman, I'd love to hear about what changes you made that improved LPL on 
> the CC2420.
> 
> Phil

the improvement is, that nodes start sending their lpl packet streams 
just at the time, when the destination node wakes up. in order to 
achieve this, nodes add their wakeup pattern information to every packet 
they send (lpl interval and wakeup offset). nodes that do not have 
timing information for their packet destination, send normal lpl packet 
streams. this reduces the time that a packet occupies the channel, and 
therefore also tho possibility of collisions.

Roman