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With the expansion of optical networks, the failure probability of dual-link failure has also improved, so it is urgent to find novel protection structures to deal with dual-link failure. In this paper, we mainly focus the protection structures to solve the problem. Firstly, we describe the scenarios and the problem of dual-link failure. Then, theory of pre-configured polyhedron (p-Poly) is introduced...
This paper addresses the problem of minimizing spectrum usage for shared-path protection with joint failure probability constraint in flexible bandwidth optical networks. To achieve this goal, we propose an integer linear programming (ILP) model for shared-path protection and a heuristic spectrum-aware shared protection (SASP) algorithm that considers joint failure probability. Simulation results...
We investigate the problem of minimizing spectrum resource consumption for a set of connection requests in a flexible bandwidth optical network under the constraint that the failure probability of each connection must be below a specified threshold. To optimize the total frequency slots consumed, three schemes are proposed and evaluated: the rescaled failure-probability-aware algorithm (RFPA), the...
We propose an ILP model and an efficient rescaled failure-probability-aware algorithm (RFPA) to minimize spectral resource consumption. Simulation results show that, compared to a traditional algorithm, both ILP model and RFPA achieve higher spectrum efficiency.
We propose a minimum-free-spectrum-block-consumption algorithm (MFSB) for shared-path protection with joint failure probability requirements in flexible bandwidth optical networks. Compared with conventional algorithms, MFSB efficiently decreases the spectrum block consumption and achieves higher spectrum utilization.
We construct k-regular and k-(edge)-connected structures for providing protection against multiple failures in optical transport networks. It improves the spare resources efficiency without increasing the complexity of design and implementation of protection mechanisms.
This paper introduces a dynamic bandwidth assignment algorithm designed for ring topology (R-DBA) in order to meet the needs of the construction of Metropolitan Area Network (MAN).This algorithm targets ring topology, based on fair iteration, supports various Qos services and has previous assignment mechanism.
A novel dynamic bandwidth allocation algorithm named GTH-DBA is proposed for metro networks. A testbed is constructed to test its performance. Numeric results show that this algorithm is effective to improve the bandwidth efficiency of the metro networks.
The hierarchical routing and wavelength assignment problem in Automatic Switched Optical Network (ASON) is researched. Based on our analysis, three adaptive algorithms called MLLR (Multi-Layer Least Loaded Routing Algorithm), WMLCR (Wavelength-graph-based Multi-Layer Least Congestion Routing Algorithm) and BMR (Backtracking-based Multi-Layer Routing Algorithm) are proposed. A platform named AHORSP...
A routing architecture based on PCE has been designed for the large, multi-layer and multi-domain optical networks, and a PCE-based fast reroute algorithm has been proposed for multi-failures in multi-domain optical networks.
We propose a novel resource demand model and a BFS-based algorithm for multi-domain L1VPN. The proposed model and algorithm are implemented on AMSON testbed by combining PCE and service plane, and verified by experiment results.
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