Adaptive routing control method
First Claim
1. An adaptive routing control method for a telecommunications network in which a plurality of switching nodes are interconnected via links each composed of a plurality of trunks, one or more routes formed by one or more of said links are provided between each node pair made up of two arbitrary ones of said switching nodes, and at least one network control center is connected via a control signal link to each of said switching nodes, said method comprising:
- a step wherein said network control center adaptively determines, for each said node pair, a set of available routes composed of routes which are set available based on the traffic volume in said telecommunications network and the trunk status of said links;
a step wherein said network control center sends said set of available routes to each switching node of each said node pair;
a step wherein each said switching node receives and stores said set of available routes sent from said network control center;
a step wherein each said switching node responds to each call-connection request to select one of said routes from said set of available routes and perform a call-connection procedure based on trunk-status information obtained with respect to the most recent call-connections through respective said routes;
a step wherein, when a call requesting said switching node for connection is a call to a transited from one of the other switching nodes which is the originating node of the call to another of said switching nodes which is the terminating node of said call, said switching node acts as a transit node, is connected to said terminating node, and transfers to said originating node trunk-status information of said link which constitutes said selected available route; and
a step wherein upon each reception of said trunk-status information corresponding to said selected available route, said originating node stores and updates said trunk-status information.
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Abstract
In a telecommunications network in which a plurality of switching nodes are interconnected via links each composed of a plurality of trunks and are each connected to a network control center via a control signal link, the network control center determines for each switching node a predetermined number of alternate routes for each first route on the basis of traffic data in the telecommunications network and supplies them as a set of available alternate routes to the switching node. The switching node assigns one or more of the available alternate routes in advance. The switching node responds to a call-connection request to try to connect the call to the first route, and when having failed in the call connection, the switching node retries the call connection through one of the assigned routes.
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Citations
28 Claims
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1. An adaptive routing control method for a telecommunications network in which a plurality of switching nodes are interconnected via links each composed of a plurality of trunks, one or more routes formed by one or more of said links are provided between each node pair made up of two arbitrary ones of said switching nodes, and at least one network control center is connected via a control signal link to each of said switching nodes, said method comprising:
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a step wherein said network control center adaptively determines, for each said node pair, a set of available routes composed of routes which are set available based on the traffic volume in said telecommunications network and the trunk status of said links; a step wherein said network control center sends said set of available routes to each switching node of each said node pair; a step wherein each said switching node receives and stores said set of available routes sent from said network control center; a step wherein each said switching node responds to each call-connection request to select one of said routes from said set of available routes and perform a call-connection procedure based on trunk-status information obtained with respect to the most recent call-connections through respective said routes; a step wherein, when a call requesting said switching node for connection is a call to a transited from one of the other switching nodes which is the originating node of the call to another of said switching nodes which is the terminating node of said call, said switching node acts as a transit node, is connected to said terminating node, and transfers to said originating node trunk-status information of said link which constitutes said selected available route; and a step wherein upon each reception of said trunk-status information corresponding to said selected available route, said originating node stores and updates said trunk-status information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification