A Construction Mechanism of Cross-domain Disjoint Communication Path Based on Hierarchical PCE in Complex Large Power Grid

With the emergence of multi-domain electric power communication network, the calculation of cross-domain protection path based on constraints becomes extremely complex, which seriously affect the reliability of electric power communication network services. Through the research and analysis of path computation element (PCE), a construction method of disjoint path based on hierarchical PCE with parallel node configuration (HPCE-PNC) is provided in this paper. At first, the parent PCE apply the virtual topology which consists of source node, the destination node and boundary nodes of each domain to calculate a set of disjoint virtual paths from source node to the destination node. Then, the child PCE maps to physical path segments through the virtual path segments, and delivers the resource information of the links to parent PCE. In the end, the parent PCE calculates the set of disjoint complete physical paths and selects a pair of disjoint paths with minimum cost as working path and backup path, and allocates resource to the disjoint paths pair. Therefore, the path results are transmitted to each node and configure parallel resource. Simulation results show that the algorithm have a high rate of path establishing and a small setup delay.