Patent ID: 8989019
Filing Date: 2015-03-24
Classification: H04L

Abstract:
1. A transmission system that comprises a plurality of transmission nodes each serving as a component of a transmission network, and a managing computer, wherein the managing computer is configured to: construct a plurality of default logical paths in the transmission network by constructing one default logical path between each of two arbitrary transmission nodes, each arbitrary transmission node connected to a communication node in advance, store correspondence information between default logical path identification information to identify one of the plurality of default logical paths and a destination of data passing through the one of the plurality of default logical paths, and set up a threshold condition about a logical path dynamically constructed in the managing computer in advance, wherein when a first of the plurality of the transmission nodes connected to a first communication node receives control information to establish a session between the first communication node and a second communication node from the first communication node, the control information containing a destination of data and a guaranteed bandwidth of the session between the first communication node and the second communication node, the first transmission node is configured to transmit the received control information to the managing computer, and wherein when the managing computer receives the control information from the first transmission node, the managing computer is configured to: specify one of the plurality of the default logical paths corresponding to the destination contained in the control information based on the correspondence information, when an available bandwidth of the specified default logical path is more than or equal to the guaranteed bandwidth contained in the control information, set up to the first transmission node, and a second transmission node, connected to the second communication node to be mapped the specified default logical path and a second logical path to identify a communication route from the first communication node to the second communication node, and when the available bandwidth of the specified default path is smaller than the guaranteed bandwidth contained in the control information and then when a specific value about the first logical path which has been dynamically constructed is less than or equal to the threshold condition about the logical path dynamically constructed in the managing computer in advance, dynamically construct a first logical path between the first transmission node and the second transmission node, the first logical path is different from the specified default path, and set up to the first communication node and the second transmission node connected to the second communication node to be mapped to the first logical path and a second logical path to identify the communication route from the first communication node to the second communication node.