Tradeoff between energy saving and quality of service in IP-over-WDM networks

Energy saving and quality of service are the most popular but contradictory criteria for resource allocation in IP-over-WMD network. Establishing of direct lightpath according to bypass architecture of IP-over-WMD network becomes reasonable when arriving traffic exceeds some threshold while under the threshold traffic have to be routed via compound path if it exists. On the other hand compound path leads to growing end-to-end delay.