Thanks for such a detailed explanation. I will try to keep track of the evolution.
Regards, Iñigo On 9/25/07, Philip Levis <[EMAIL PROTECTED]> wrote: > On Sep 24, 2007, at 9:34 PM, Iñigo Urteaga wrote: > > > Hi, > > > > Thanks for the appreciation. However, I still have the compiling > > errors related to Collection. > > I thought it might be useful to make a few notes about the current > state of collection, because it's really the first time there's been > some cross-WG collaboration and we're trying to figure out the way to > handle CVS when there are some experimental extensions that look very > promising. > > The net2 working group proposed adding a new interface to link-layer > communication, based on experiences developing link estimators for > collection. This interface provides the "white bit," which allows a > higher layer to ask if the channel had high quality during a packet. > Because this would be part of the packet HIL, it's core's > responsibility. So core and net2 started talking about the tradeoffs. > Core agreed that it sounded like a good idea, but wanted experimental > evidence that it helped before making it a HIL. > > In a series of experiments, net2 showed that the white bit can > significantly improve link estimation. For the gory details, you can > read the technical report SING-07-00, which is a draft of a > submission to HotNets.[1] The short story is that, in comparison to > MultihopLQI, the new CTP link estimator reduces routing cost > (transmissions per packet delivered to base station) by 29% and is > much more effective in sparse topologies. Based on these results, > core gave the go-ahead to take the next step, which is to demonstrate > that the white bit can be implemented on different radio chips and > helps more than the CC2420. > > Incorporating the white bit involves some significant changes to CTP > (the net2 collection protocol); trying to maintain a parallel CTP was > seen to be too big a deal, especially given the benefits we've seen > with CC2420-based platforms. So Om and Rodrigo checked in the new CTP > version. The recent collection problems are due to the need to iron > out some of the lingering issues. For example, since the white bit is > not yet an HIL, it's not part of ActiveMessageC; this means that the > link estimator needs #define statements to link to the right radio > chip. If the white bit joins the HIL, then this cruft will go away. > > Anyways, that's the situation. > > Phil > > [1] http://sing.stanford.edu/singpubs.html > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
