Performance analysis of dynamic lightpath configuration for symmetric WDM ring networks

In this paper, we consider a dynamic lightpath configuration method where a lightpath supports multiple label switched paths (LSPs). In this method, lightpaths are established according to the congestion state of node and are released after some holding time. For the performance evaluation of the method for symmetric WDM ring networks, we consider analytical models in light and heavy traffic cases. In the light traffic case, a single node in the WDM ring network is modeled as a multiple queueing system, while M/G/1/K and M/G/c/c queues are used for the heavy traffic case. In both cases, loss probability of packet flow and wavelength utilization factor are derived. Numerical examples show that our analytical models in both cases are useful to predict the loss probability of packet flow and the wavelength utilization factor.