This Final Master Project introduces a new strategy to provide QoS in IP/OBS
networks, using routing with prioritization based on statistics, named RPBS. A
new method is provided and subsequently validated. This proposal uses the
feedback scheme in optical networks to provide statistical knowledge with the
objective of finding a suitable route to reach each destination from a specific
source node, with more chance of success. This yields a twofold outcome. First,
the losses can be reduced in a big number due to statistics. Second, the delays are
also reduced compared with other methods based on feedback scheme. These two
improvements allow better QoS provision, supporting class differentiation and
more efficient resources utilization. The benefits of this proposal are quantified
and further compared against existent alternatives by simulations
