RE : [DNA-BOF] Re: link "hints"

[BERTIN Philippe FTRD/DMR/REN <philippe.bertin@francetelecom.com>]

Hi,


> c. Radio measurements.  This can include a wide spectrum of 
> things under consideration in IEEE 802.11k, including 
> measurements of signal strength, S/N ratio, packet loss, 
> jitter, etc.  While many of these things might be relevant to 
> roaming or load balancing decisions, they don't appear 
> relevant to DNA in that they don't provide "hints" relating 
> to the network topology of a potential point of attachment.
> 

Yes, these measurements do not refer to the network topology. They
provide information on the QoS that can be expected by using a given
link layer interface (and then a given network topology). I find no
sense in directing an ongoing traffic to a new interface if it is
overloaded and the signal quality is very poor. So these measurements
characterising current link capabilities will help in choosing the right
network topology to use for the Mobile Node. 

In my opinion, hints cataloging work should be as much exhaustive as
possible. This is motivated by the fact that providing a good level of
abstraction of link layer availabilities and capabilities should be of
interest for several mobility/QoS related groups. Maybe DNA protocols
will use only a subset of those abstractions but the link hints
framework will probably be used also by other WGs. So as we have a good
opportunity to catalog and standardise abstractions for link hints
within the DNA group, I propose to not restricting this work too much by
focusing on its applicability to a single problem.

Philippe