Multiple Service Support In Optical Burst Switching Network

Over the decades, optical network has been undergoing dramatic changes. The rapid expansion of Internet and continued growth of data service have posed a serious challenge to the current computer and telecommunication networks. Service diversity has become one of the most important features for the future Internet. Thus, it has become a most urgent issue to build a new flexible yet reliable optical network, while has the ability to meet different service demands. Optical burst switching (OBS) network is a key technology to support the development of the next-generation optical network. With a separation of control and data channel, delayed reservation and burst switching ability, OBS has achieved extensive study from both the academic and industrial communities all over the world for its flexible switching capability and high feasibility. However, as optical network continues to develop, users’ needs also keep growing. In order to make OBS a key supporting switching technique for the future optical network, we have to facilitate OBS network with the ability of multi-service support. Therefore, with the orientation of future network transformation and service development, the ability to support different services in OBS network is studied in this dissertation, including the technology to support reliable service, high bandwidth multicast service and dynamic service. The specific research issues are as follows:(1) In order to support the reliable service, we have studied how to provide reliable transmission for the services from the point of reducing packet loss and enhancing network survivability. A novel adaptive offset time scheme is proposed to reduce packet loss in OBS network, where larger bursts are assigned with longer offset time so that they can have a higer priority in resource reservation and therefore a lower loss rate, which as a result improves the network throughput. A1+1protection mechanism based on burst cloning is also proposed for labeled optical burst switching (LOBS) network, which aims to improve the service transmission reliability by cloning the bursts at the source and transmitting them along disjoint paths. Both schemes are demonstrated through network simulation or experiments on the LOBS testbed, respectively.(2) In order to support the high bandwidth multicast service and build a transparent OBS network, we have studied how to transparently provide multicast support for the high bandwidth service in the network, as well as the meaning and key technologies to build a transparent OBS network. We have also analysed the multicast service in WDM and OBS networks, and the related popular and key technologies on both control and data planes. For the sake of power compensation due to transmission and multicast, we have emphasized the importance of all optical amplification in OBS network, and studied the EDFA transient effect induced by the bursty traffic in OBS networks as well as the existing transient suppression techniques. A novel scalable structure design based on multi-wavelength conversion (MWC) is proposed for the first time and experimentally demonstrated here for integrated optical multicast and burst amplification. Multiple burst clones are obtained for multicast, while EDFA transients are suppressed effectively during the burst amplification to guarantee the transparent service transmission. A corresponding routing and wavelength assignment algorithm (RWA) is also proposed to provide multicast support on the control plane and minimize the cost of wavelength conversions in the network. Simulations and experiments have been conducted to demonstrate the performance of the proposed node structure and the wavelength assignment algorithm.(3) In order to build a flexible and reliable optical network and support the dynamic service, we have introduced and improved a novel optical network structure for the first time:LOBS-HC. LOBS-HC network combines the advantages of both OCS and OBS, which ensures guaranteed service bandwidth while still taking advantage of statistical multiplexing to achieve flexible switching ability in a fine granularity. Two wavelength assignment algorithms based on single source optimization and multiple sources optimization are proposed to improve the performance of LOBS-HC network, and such a network is compared with the current IP/WDM network with traffic grooming ability. Simulation results show that equal or better wavelength utilization can be achieved in LOBS-HC while less router resource is consumed as well. On the other hand, to enhance the ability to support dynamic service in LOBS-HC network, a novel HC grouping mechanism under dynamic service is proposed, i.e. incremental HC regrouping algorithm (IHCR). IHCR can support service dynamics at an extremely low control cost of traffic regrouping, which proves that LOBS-HC can not only provide reliable transmission and flexible switching for the service, but also support both static and dynamic service perfectly, making it a strong candidate as the next generation optical network infrastructure.