Port Modular Obs Scheduling Policy And Optical Multicast Key Device Placed

This paper discussed two different topics in the domain of optical network. For OBS technology, we presented a new scheduling policy containing both certain switching node architecture and scheduling algorithm. This scheduling policy can reduce packet loss rate in an OBS network. For multicasting in optical network, this paper focused on placement of key nodes such as wavelength conversion nodes and splitting nodes. It investigates into the affair of how the multicast traffic blocking rate is influenced by the number of key nodes in a WDM network. It also proposed several policies for placing key nodes with the aim of reducing blocking rate for dynamic multicast traffic.The basic idea of OBS is to integrate the huge band within a fiber and the convenience of electronic processing. Data packet and control packet are sent in different channels. While a control packet is processed at each switching node, an all optical light path is set up dynamically for the corresponding data packet. Switching node architecture and scheduling algorithm have great influence on packet loss rate in OBS network. This paper proposed a port modularized scheduling policy that combines these two aspects, with the aim of reducing burst packet loss rate. Simulation shows that with the appropriate setting, our port modularized scheduling policy can remarkably reduce packet loss rate.Optical multicast provides a way of sending message from one node two multiple nodes in optical network. This facilities application such as videoconferencing. To better support multicast in optical network, switching node should be equipped with certain components such as light splitter and wavelength converter. The node with the light splitting or wavelength conversion capability is called a key node. Sometimes, only part of the switching nodes can be set as key nodes. So how to locate the key nodes to minimize traffic blocking rate (for dynamic traffic) or to maximize network capability (for static traffic) is of great importance. As far as we know, research has only been done with static traffic. This paper, for the first time, we evaluates how traffic blocking rate is influence by the number of randomly placed key nodes. It also proposed several key node placement strategy to reduce the blocking rate of dynamic...