On Thu, Jul 24, 2008 at 11:32 PM, Nahr ... <[EMAIL PROTECTED]> wrote: > > > 2008/5/13 Nahr ... <[EMAIL PROTECTED]>: >> >> Thank you very much. >> yes yes colection concerns routing not link layer. >> >> Cheers, >> Nahr Elk >> >> 2008/5/13, Omprakash Gnawali <[EMAIL PROTECTED]>: >>> >>> On Mon, May 12, 2008 at 12:27 PM, Nahr ... <[EMAIL PROTECTED]> wrote: >>> > Hi, >>> > I just want to know how much a node retransmit a not acked msg and how >>> > long? >>> > for exemple A sends msg to B >>> > B receive the msg and sends Ack >>> > :( ack is lost. >>> > >>> > 1. How long A wait the msg ack? >>> >>> Collection does not send an ack - it relies on link layer ack. >>> >>> > 2. How much A retransmit the not acked msg ? >>> >>> CTP will usually retransmit 5-7 times before it switches the parent. >>> >>> - om_p > > I am sorry for asking the same question an other time, > but you said to me that CTP retransmit 5-7 times before it switches the > parent but when I look to the Forwarding engine I found that MAx-retries = > 30 !!! > > so how do you calculate the number of packet retransmission? >
When a re/transmission fails, that information is fed back to the link estimator which will update the quality of the link. If there are a few failures, the link estimator will have updated the quality of the link to be low enough that you will have paths through other links that are better than the path through the current parent. At that point, you switch the parent. So, you are retransmitting to a parent a few times before you switch to a new parent. - om_p _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
