Recovery schemes for optical burst switching networks

Abstract

Optical Burst Switching (OBS) has been proposed as an alternative switching technology for the next optical backbone network based the current technology. It has common advantages of Optical Circuit Switching (OCS) and Optical Packet Switching (OPS). But many constraints are inevitable when we consider protection/restoration against a failure. We propose three protection schemes considering the properties of OBS suitable for survivable OBS networks. First, we propose 1:1 path-based OBS protection scheme for simple recovery procedure while the data burst loss is quite related with the network size. Secondly, we propose 1:1 link-based OBS protection scheme for less data loss and faster recovery than 1:1 path-based OBS protection scheme. Thirdly, we propose the dynamically resources-shared protection scheme for high resources utilization as well as advantages of 1:1 link-based OBS protection scheme. In addition, it can provide deliberate protection for low priority bursts that are not considered in other schemes. We solve ``coloring mixing`` problem caused from statistical multiplexing in dynamically resources-shared protection scheme too. It gives new chance to optical networks by enabling label stacking/merging.