Wavelength reservation with parallel waiting in WDM networks

This paper proposes a novel recovery method, parallel waiting, from a wavelength reservation failure for all-optical networks. Each core router uses a timer and waits for the release of a wavelength if it detects a reservation failure. In addition, forwarding of a reservation request message is not blocked even in case of a reservation failure. Thus, waiting and forwarding are concurrently applied and multiple core routers may wait simultaneously. Based on the parallel waiting recovery, we design a conservative forward waiting (CFW) wavelength reservation protocol