I tried to raise the same questions on this forum several months ago, but also didn't get a clear answer. So, relying on this (the lack of negation) and on My results, the results posted here: http://sourceforge.net/apps/mediawiki/takatuka/index.php?title=Results And here: http://www.pats.ua.ac.be/content/publications/2009/dvdakker09tinyspotcomm.pdf
I conclude that this is the minimum achievable delay. Arik On Tue, Apr 6, 2010 at 20:18, Deeksha Rao Sahib <[email protected]>wrote: > Hey Arik, > > So can i conclude that this min delay cannot be avoided?? > > Hi Deeksha, > > > > I have investigated the same issue, and tried to reduce the CSMA > > thresholds; > > but couldn't achieve less then about 18 mSec (average). > > Of course it depends on the packet's size. > > > > Arik > > > > > > On Tue, Apr 6, 2010 at 15:56, Deeksha Rao Sahib > > <[email protected]>wrote: > > > >> > >> Hi, > >> > >> If the delays are due to backoffs then disabling the CCA should give me > >> lesser delay rite?? > >> > >> But its still the same.. > >> > >> Printing local times at CC2420 Transmit and Receive programs what i > >> found > >> out is that at the sender there is a min delay of 9ms between call > >> AMSend.send command and the SendDone event. > >> > >> Also at the receiver side there is a delay of 13ms by the time receive > >> event is triggered in the application when compared with the timestamp.. > >> > >> Can these delays be trusted or is there any mistake in this analysis?? > >> > >> > > >> >> On Wed, Mar 31, 2010 at 1:40 AM, Deeksha Rao Sahib > >> >> <[email protected]> wrote: > >> >>> > >> >>> Hi all, > >> >>> > >> >>> I am using FTSP in my code for time sync and I've been trying to > >> >>> measure > >> >>> the hop delay for different links in the network. From the initial > >> >>> tests > >> >>> using global time and the timestamps i figure out that the per hop > >> >>> delay > >> >>> is about 20 ms. > >> >>> > >> >>> My applications requires that this delay be minimized. How can this > >> be > >> >>> done?? > >> >>> Any inputs would help... > >> >> > >> >> Some of that delay is due to MAC backoffs etc. before the packets are > >> >> sent. You can reduce them but that can invite suboptimal MAC > >> >> performance. > >> >> > >> >> - om_p > >> >> > >> >> -- > >> >> This message has been scanned for viruses and > >> >> dangerous content by MailScanner, and is > >> >> believed to be clean. > >> >> > >> > > >> > > >> > --Deeksha > >> > > >> > >> > >> --Deeksha > >> > >> -- > >> This message has been scanned for viruses and > >> dangerous content by MailScanner, and is > >> believed to be clean. > >> > >> _______________________________________________ > >> Tinyos-help mailing list > >> [email protected] > >> > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > >> > > > > > > > > -- > > Best Regards, > > Arik Sapojnik > > > > -- > > This message has been scanned for viruses and > > dangerous content by MailScanner, and is > > believed to be clean. > > > > > > > --Deeksha > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > -- Best Regards, Arik Sapojnik
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