giuseppe4 wrote: "as MIR in Cambium (which doesn't supports burst so I can't use it)."
That is something we, and many others, have been asking for too. Most other products (Ubiquiti, StarOS, MikroTik, etc) all have it in some form.
Everyone will want to vote / kudo / comment on the feature request here: :)
http://community.cambiumnetworks.com/t5/Your-Ideas/qos-with-burst-for-epmp/idi-p/39923