[Tinyos-help] about CTP

[jiwen zhang]

hello om_p:
   can you  recommend some papers about CTP so i can understand CTP
implementation easily ?
   thank you!!


2008/3/13, Omprakash Gnawali <gnawali at usc.edu>:
>
> On Wed, Mar 12, 2008 at 6:50 AM, jiwen zhang <zhangjiwen029 at gmail.com>
> wrote:
> > Hello all :
> >    as we know , ACKs is on link layer , that is to say if a mote
> receives a
> > packet , it will return an ACKs to the sender. but how to ensure data
> > transmission in network layer ? for exaple , in a mulitihop sensor
> network ,
> > a mote receives a packet and returns the ACK. maybe it has received many
> > packets waiting to send and the queue is full , so it has to discard it
> , so
> > the packet may not get to Root(in CTP) . (i don't know if i say it
> clealy ,
> > in short, i want to know whether there is a  route layer ACK in CTP)
>
> No, there isn't.
>
> >   how the problem is solved in CTP ?
>
> If the packet was not acknowledged (you can look at the ack bit of the
> packet), you retransmit.
>
> - om_p
>
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