The fast parallel restoration (FPR) scheme is proposed to achieve the fast setup of restoration label switched path (LSP) in the distributed optical networks. The scheme is derived by dividing the whole restoration LSP into several segments of sub-LSP and triggering each sub-LSP along the new route to finish the signaling procedure concurrently, and subsequently merging all sub-LSPs into a whole LSP. The theoretical analysis and simulation results show that the FPR scheme outperforms the other two typical restoration schemes in terms of connection setup time.
Network coding brings many benefits for multicast networks.It is necessary to introduce network coding into optical networks.Nevertheless,the traditional network coding scheme is hard to be implemented in optical networks because of the weak operation capability in photonic domain.In the paper,we focused on realizing two-channel network coding in all-optical multicast networks.An optical network coding scheme which can be realized via logic shift and logic XOR operations in photonic domain was proposed.Moreover,to perform the network coding scheme the coding node structure was designed and the operation principle and processes were illustrated in detail.In the end of the paper,the performance and the cost of different all-optical multicast mode were compared and analyzed.
We present a network-level signaling mechanism for user access and service setup in light emitting diode(LED)-based visible light communication(VLC) networks and define the corresponding signaling messages.In this mechanism,lamp selection is an important step for realizing flexible user access and efficient resource allocation.Two basic selection schemes are proposed,and an enhanced bandwidth-based scheme is presented.Simulation results show the different advantages among these schemes.
Transport network paths are typically bidirectional and symmetrical. In multi-protocol label switching (MPLS) and generalized MPLS (GMPLS) mechanisms, independent labels are distributed for bidirectional paths. Thus, the requirement of the MPLS transport profile (MPLS-TP), which is a new transport technology, could not be satisfied efficiently. A novel label distribution mechanism for bidirectional paths in MPLS-TP networks is proposed. Labels distributed by the mechanism are symmetrical and can re?ect the pairing relationship of the forward and backward directions of the transport path.
