Research On Resource Scheduling In Wavelength-Switched Optical Network

WSON evolves and develops the ASON control plane technology further. It is an ASON based on WDM transmission network. Beside the traditional ASON function, WSON mainly extends the fiber/lambda automatic discovery in WDM, RWA, and routing optimization with optical impairments, etc.WSON introduces the control plane to wavelength networks, realizes the dynamic scheduling of wavelength path, enhances the flexibility of WDM networks scheduling and efficiency of networks management. Internet drafts are invited for IETF CCAMP work groups, to support the light layer of resource discovery, wavelength and route calculation, and signaling protocols extension. Now, the WSON frameworks and requirements standardization has already completed.Although, the work for WSON is still "standardizing, it will take a long time to maturity, the Value added of WSON applications is certain for networks.WSON could make the optical networks more reliable, efficient and intelligent; it will be suitable for more transmission technology in future.However, there are still many challenges in the process of its practical use. The key technology of WSON research is focus on PCE framework in WSON, distributed resource contention,RWA and optical impairments.This paper researches on resource scheduling and proposes several solutions.A new route algorithm is shown that the PCE of GMPLS-based WSON could be extended for WSON survivability technology, three improved resource collision avoidance algorithms are given for resource scheduling and a precautionary performance monitoring mechanism is proposed to solve the optical impairments and congestion control.