A heuristic priority based wavelength assignment scheme for optical networks

We propose a heuristic priority based wavelength assignment (HPWA) scheme to minimize the blocking probability. In this scheme, the connection requests having same s–d pair are groomed first and then these groomed connection requests are served for routing and wavelength assignment according to their priority order. The priority order of each groomed connection request is estimated based on both the types of path (direct link physical path or in-direct link physical path) first and then their traffic volume. The performance analysis of our proposed scheme is made in terms of blocking probability and compared the same with similar heuristic non-priority based wavelength assignment (HNPWA) scheme. Simulation study shows that the blocking probability of HPWA scheme is less than that of NPRWA. It is also seen that the performance of the proposed scheme is better in comparison to HNPWA, when the number of connection requests increases in the network.