Collision-safe wavelength assignment scheme for lightpath establishment in WSONs

In this paper, a new wavelength assignment scheme called CSSIR (collision-safe source-initiated reservation) has been proposed for distributed lightpath establishment in GMPLS/PCE based Wavelength-switched Optical Networks (WSONs), which has DIR-like forward blocking probability with SIR-like backward blocking probability. In CSSIR, the PCE selects one wavelength reserved with multi-backup to protect the collision. Simulations are conducted to compare it with SIR&DIR. The results show that CSSIR performs better in total blocking than the others under various traffic loads.