Abstract
In this paper, a Max-CU-VF (Maximum Channel Utilization with Void Filling)
channel scheduling algorithm for OBS (Optical Burst Switching) is proposed,
which chooses the feasible data channel with the maximum channel utilization
as the optimal one. The channel utilization defined in Max-CU-VF is the total
length of scheduled BDPs (Burst Data Packet) on a data channel in a limited
observing time window. The scheduling time can be decreased due to the elimination
of time consumed in searching procedure in comparison with the traditional
schedulers based on LAUC-VF (Latest Available Unused Channel with Void Filling).
The hardware processing scheme and the corresponding hardware architecture
for Max-CU-VF are designed in detail. A 16-channel Max-CU-VF based scheduler
is demonstrated on FPGA (Field Programmable Gate Array). A scheduling time
of 12.5 ns per BCP (Burst Control Packet) is achieved on the real-time running
Max-CU-VF based scheduler. The performance of the Max-CU-VF is also compared
with LAUC-VF through NS2 simulation. The results show that the burst loss
ratio and the average throughput of Max-CU-VF are close to those of LAUC-VF
when the load is light, and the faster Max-CU-VF outperforms the slower LAUC-VF
very much when the arrival rate of bursts is over the processing speed of
LAUC-VF. Therefore, Max-CU-VF is more suitable for future high speed OBS networks.
© 2013 IEEE
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