[Tinyos-help] tree level (hop count) information in CTP?

[Omprakash Gnawali]

On Wed, Oct 1, 2008 at 1:09 PM, Philip Levis <pal at cs.stanford.edu> wrote:
>
> On Oct 1, 2008, at 12:22 PM, Hui Kang wrote:
>
>> The root can get the hop counter from getTHL.
>> But how can a node infer the hop counter to root?
>
> It can't. CTP uses ETX, not hopcount, to measure distance to the root, and
> it doesn't keep track of hopcount.
>

If ETX is 8, the maximum distance is 8 hops and looking at the minimum
threshold for link ETX, one can also estimate the minimum distance.

- om_p