Based On Optical Burst Switching Grid

Currently, most Grids which based on dedicated Optical Circuit Switching infrastructure are used in the area of scientific study. To make Grids available to the public at large, more flexible optical network is needed. Optical Burst Switch (OBS) technology which combines the advantages of Optical Circuit Switching and Optical Packet Switching is considered as a promising technology for the Pervasive Grid. The characters of Pervasive Grid and OBS are studied in this paper, and a practical combination way is proposed.How Pervasive Grid traffic accesses the OBS network is studied in the first part of this paper. Assuming Pervasive Grid traffic has the same self similar character as Internet, the simulation results show that the traffic's delay and drop rate are affected minorly and randomly by self similar factor. When the burst size is big enough, the drop rate no longer decreases as the burst size increases. The burst transfer delay in the network is not influenced much by the traffic load. However, the delay of self similar traffic vary a lot with the traffic load, the lower the load, the longer the delay. Considering the results above, a suitable OBS edge node structure for Pervasive Grid traffic is proposed. In the scheme, Grid traffic apart from normal Internet traffic accesses the OBS network through Grid Network Interface. The Grid jobs are encapsulated into bursts according to the task by the GNI, within the limitation of the burst size thresholds. The simulation results show the performance of the OBS network will not be deteriorated, and Grid traffic will not suffer the low traffic delay.In the second part of this paper, the solution for anycast in OBS Grid is studied. The network layer implementing way and the application layer way are compared. Application layer way is considered as a more flexible and practical solution for OBS Grid, by which control channel congestion can be avoid, core node can be simplified and advanced Grid Services can be supported. Then, a design for OBS Grid application layer anycast which are based on SIP is presented. In the design, Grid user/resource register, resource information collection and resource booking are accomplished. And the same signaling process can be used by advanced Grid service and basic Grid service.