Incremental upgrade planning algorithm for WSON based on link scoring

With the arrival of the 5G mobile communication technology, Internet traffic is expected to grow threefold globally in the next five years. In order to meet the demand of explosive service and the construction of intelligent Optical Network in the future, a backbone transmission Network based on Wavelength Switched Optical Network (WSON) arises at the historic moment. But the WSON backbone transmission network also faces the limitation of network capacity. This paper proposes a link scoring algorithm, scores each link and chooses the link which gets the highest score to expand, which can quantitatively evaluate the link status and find the network capacity bottleneck. Using the algorithm, it uses 12 iterations to transmit the traffic, while uses 16 iterations choosing the traditional method. By choosing to expand the bottleneck link step by step, the transmission cost can be minimized.