WDMネットワークにおけるホップ数に応じて波長変換を行う光パス設定方式の提案と性能評価

摘要

波長変換器を用いたWDMネットワークでは，波長を変換し光パス設定を行うため，同一波長を確保するリンク数が少なくなり，棄却率低減が見込める.しかし，波長変換器は高価でありすべてノードが装備することはコスト面において困難である.本研究では少ない波長変換器教で従来手法と同等の棄却率を実現することを目的とする.そして，送信先までのホップ数に閾値を設け，閾値以上の要求に対して波長変換を行う光パス設定を行う手法を提案する.性能評価によって提案手法は従来方式と比べ，少ない波長変換器教で同等の性能が実現可能であることが確認された.%In WDM(Wavelength Division Multiplexing) networks, blocking probability becomes higher as number of hops to destination increases because the same wavelength has to receive on all links. Blocking probability can get lower by using wavelength converter. However, it is difficult to equipment wavelength converter to all nodes due to too expensive. In this paper, we proposed a new optical wavelength path establishment method with wavelength converter based on number of hops. We set threshold to number of hops to destination, Our basic idea is to select a route via wavelength converter request more than threshold. Our methods is to achieve lower blocking probability and fewer number of wavelength converters by applying our algorithm for request more than threshold. In our simulation, we showed our method is low blocking probability and fewer number of wavelength converter than any other existing methods.