QOS-aware lightpath scheduling mechanism for GMPLS/PCE Lambda Gird

Lambda-Gird offers dedicated, optical, circuit-switched, point-to-point connections, which may be reserved exclusively for Data-intensive applications. However, such dedicated high-speed connections push the network congestion and its transmission rate of these applications may not match the bandwidths of dedicated lightpath in most case. So in this paper, a new QoS-aware lightpath scheduling mechanism called QLSM has been proposed to extend the GMPLS/PCE for lightpath establishment and restoration in Data-intensive DWDM. The QLSM scheme assigns a wavelength-weight to denote the concurrent reservation wavelength utilization rate and then PCE could select several preferable wavelengths according to the weight for source node. It will also block the new request step by step according to QoS level when the lightpath restored. The experimental results show that QLSM based on QoS level performs better in total blocking and resource utilization rate.