Advance Reservation and Dynamic Scheduling of Point to Multipoint Lightpaths

Advance reservation is a technique employed so that a request is guaranteed 100% availability of the resource it applied for sometimes earlier. In this paper we introduce the concept of advance reservation of lightpaths for a certain request characterized by some source and multiple destinations and also the time when network resources are demanded. We first present a point to multipoint adaptive routing algorithm that forms the basis of establishing lightpaths. Then the lightpaths are in fixed on the route through a wavelength assignment technique that works along with an advance reservation scheme to ensure conflict resolution among incoming requests. Based on our algorithm, we run our simulation model to generate results and exemplify the fact that advance reservation outruns on-demand reservation as far as the blocking probability is concerned.