The PBR Approach: Analysis, Performance and Perspective

Usual RWA (routing and wavelength assignment) algorithms take the lightpath decision based on the network state information existing in those nodes caring about it. Unfortunately, this information might not be accurate enough so that the routing decisions could be incorrectly performed hence driving to a significant connection blocking increment. The prediction-based routing mechanism appears as an appealing and solid contribution challenging the inaccuracy introduced in the RWA problem. A significant topic currently raising many research efforts is the influence of physical impairments on the network performance degradation, in particular on the lightpath selection process. Some parameters should be added to the routing protocol to include information related to physical impairments. Authors in this paper aim at analysing main PBR contributions also presenting main issues related to the introduction of physical parameters in the routing protocol