Efficient Path-Segment Protection Utilizing Logical Ring Approach in WDM Mesh Network

• Main Authors: Chien Chih-Dar, 簡志達
• Other Authors: I-Shyan Hwang
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/57220397451241178913

碩士 === 元智大學 === 資訊工程學系 === 92 === This work proposes a distributed fault protection mechanism called the Dynamic-Shared Segment Protection (DSSP) algorithm for WDM (Wavelength Division Multiplexing) mesh network. The exploration applies the shared protection scheme in the network with constraints of Shared Risk Link Group (SRLG) and shared bandwidth assignment to assure the setup protection path probability and network resources efficiency. The proposed approach exploits the segment protection mode, which accommodates the characteristics of both path-based and link-based protections, for providing more and finer service granularities, to satisfy the versatile requirements of critical applications in foreseeable future. The protection paths are pre-calculated by the logical rings, which are dynamically created from mesh networks. Accordingly, the DSSP algorithm is able to select the suitable logical rings to be protection paths quickly once a working path is assigned. To show that DSSP can improve performance efficiency, simulations are conducted using four networks (NSFnet, USANET, Mesh 6x6, Mesh 9x9) for a comparative study between ordinary shared protection schemes and SLSP (Short Leap Shared Protection). Simulation results reveal that the proposed method works extremely lower blocking probability and has fewer hop counts. Consequently, it is very useful for application to a real-time WDM network, which changes status dynamically.