Rerouting Schemes for Dynamic Traffic Grooming in Optical WDM Mesh Networks

Authors

Wang Yao, University of Nebraska-LincolnFollow
Byrav Ramamurthy, University of Nebraska-LincolnFollow

Date of this Version

2004

Comments

Published in IEEE Global Telecommunications Conference, 2004. GLOBECOM '04. Copyright 2004 IEEE. Used by permission.

Abstract

Traffic grooming in optical WDM mesh networks is a two-layer routing problem to effectively pack low-rate connections onto high-rate lightpaths, which, in turn, are established on wavelength links. In this work, we employ the rerouting approach to improve the network throughput under the dynamic traffic model. We propose two rerouting schemes, rerouting at lightpath level (RRAL) and rerouting at connection level (RRAC). A qualitative comparison is made between RRAL and RRAC. We also propose the critical-wavelength-avoiding one-lightpath-limited (CWA-1L) and critical-lightpath-avoiding one-connection-limited (CLA-1C) rerouting heuristics, which are based on the two rerouting schemes respectively. Simulation results show that rerouting reduces the connection blocking probability significantly.