| 摘要 |
PURPOSE: A routing method considering calls in the process of setting up connection in PNNI (Private Network Network Interface) is provided to not only set up a reliable path based upon routing information as to calls in the process of setting up connection by an exchanger in PNNI, but also reduce load required for setting up connection in PNNI. CONSTITUTION: If receiving a signaling message requesting to set up calls in a node, a routing unit (110) in PNNI determines whether or not a path list pointed out in the node is created or supplemented. If necessary, the routing unit (110) sets up substitute paths from a PNNI routing table (120) including reachability information stored at the exchanger. And then, the routing unit (110) determines a path on the basis of considering the established substitute paths and path information concerning the processing calls stored at a setup table (200) together. The determined path has minimum effect upon a traffic matrix in the case of setting up both the estimated connecting numbers necessary to the determined path among the paths capable of connection and the connection among the estimated paths. After that, the routing unit (110) stores the information and the traffic matrix from the received message at the setup table (200). If receiving a message not requesting to set up a path, the routing unit (110) extracts parameters from traffic parameters, necessary to general connection and path information from the path lists, and then stores them at the setup table (200). In addition, if receiving a message related with connection and release for calls in the process of setting up connection, the routing unit (110) remove the information as to the calls.
|
