Reverse dispatching scheme for satellite Clos-network switches

For the special requirements of the on-board switching for satellite communication on hardware complexity and matching efficiency, the reverse dispatching scheme for MSM Clos-network switches is proposed. Unlike the previous dispatching schemes which perform matching according to the order of modules, the reverse dispatching scheme first buffers requests, and then performs internal matching in central modules instead. Then the results of the matching are used for the cell-sending in input modules. Different steps of the whole dispatching scheme are isolated in this dispatching scheme, which means that the performance of a step does not depend on the result of the preceding one. Then the whole dispatching scheme can be performed in a pipelined manner. Simulation results show that the reverse dispatching scheme can improve the dispatching efficiency without additional hardware overhead and achieve a low end-to-end delay.