Before revision:  To overcome this limitation, an enhanced global timing analysis , accounting the flow serialization phenomena along the flow path , is proposed in this paper to improve the delay bounds tightness. The main contribution consists in defining and proving a closed form formula of the guaranteed end-to-end service curve of any flow of interest crossing a FIFO ring-based network.
After revision:  To overcome this limitation, an enhanced global timing analysis , accounting the flow serialization phenomena along the flow path .