Performance model of deflection-routed multi-slot batch-transfer networks

published_or_final_versionWith the recently proposed multi-slot batch-transfer (MSBT) architecture, we can build optical packet switches using slow switching fabrics with reconfiguration time larger than the guard time between packets. Since MSBT switches can provide multichannel capability with no additional hardware, we propose to combine the multichannel and deflection routing approaches for packet contention resolution in MSBT networks. As there is no analytical performance model available, we derive the required model in this paper. Simulations show that the model is very accurate. © 2008 IEEE.link_to_subscribed_fulltextThe IEEE Global Telecommunications Conference (GLOBECOM 2008), New Orleans, LO., USA, 30 November-4 December 2008

Performance Model of Multichannel Deflection-Routed All-Optical Networks With Packet Injection Control

Deflection routing is a feasible approach to resolve the output contention problem in packet-switched networks when buffering of packets is not practical. In this paper, we investigate the performance of multichannel deflection-routed networks with no packet injection control, strict packet injection control, and a simple token-bucket-based packet injection control. The analytical performance models of multichannel deflection-routed networks with strict packet injection control are derived. Simulation results show that the analytical models can accurately predict the performance regardless of the network topology, number of channels, and packet injection control methods. We observed that the end-to-end throughput-delay and the packet re-transmission performance at sources can be largely improved by using simple packet injection control mechanisms such as the proposed token-bucket-based method.postprin

Multi-slot batch-transfer optical packet switch

In optical packet switching, the reconfiguration time of optical switches should only be a small fraction of the packet transmission time for efficient utilization of the bandwidth. This constraint puts a very stringent demand on the switch reconfiguration time as the transmission rate of optical fiber increases. By using batch transfer of packets, we propose an optical switch architecture that can significantly relax the requirement on switch reconfiguration time. The utilization of the transmission links is greatly improved because the guard time between packets is no longer related to the switch reconfiguration time. We have also demonstrated analytically that the proposed switch architecture can significantly reduce the packet loss probability, at the expense of an increase in the delay variations, if the packets are not restricted to their original time slots at the switch output. © 2007 IEEE.link_to_subscribed_fulltex