QoS-aware united control protocol for optical burst switching in software defined optical networks

摘要

The present invention is directed to a QoS-aware unified protocol that is applicable in the control plane of software defined networks, which can bring following benefits and includes optical burst switching protocol mainly requires four key operations; burst assembling, burst routing, burst scheduling, and control packet signaling protocols.

主权项

1. A computer implemented method for Quality of service QoS aware unified control protocol for optical burst switching in software defined networks comprising the steps of:
employing an adaptive burst assembling protocol for providing network state information and application latency requirements; using a latency aware burst routing for determining burst routing and scheduling while observing a wavelength continuity restraint responsive to said adaptive burst assembling protocol; utilizing OpenFlow protocol extensions for realizing a QoS aware unified control protocol for optical burst switching OBS; pre-calculating K-alternate shortest routes between a plurality of source-destination pairs; determining an occupancy bit-map of each wavelength along the pre-calculated K-alternate shortest paths by performing the logical end operations of the wavelength occupancy states of the same wavelength of all links along the route in each time slot; finding a set of consecutive available time slots (void islands) with at least a width of (Bbst/Y) in an occupancy bit-map of each wavelength along K-alternate shortest routes, and starting time slots at which void islands are available where Bbst denotes a size of a burst to be transmitted between source and destination edge nodes and where Y denotes channel bandwidth in a time slot; and selecting a void island based on the width for a given class of traffic for carrying out the QoS aware unified control protocol for performing burst routing and burst scheduling operations using the latency-aware burst routing, estimating a burst size for future arrival of traffic using the burst estimation.