Importance

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Abstract

In a connection-oriented network, a source network node responds to a connection request from a source user by sending signaling messages to adjacent nodes to request reservation of multiple paths by specifying a QOS parameter of minimum level and then establishes to a destination node if the requests are accepted. The source network node selects one of the established paths and sends a second signaling message to the node of the selected path, requesting that the QOS parameter of the selected path be increased from the minimum level to a level specified by the connection request, and establishes a connection from the source user to a destination user via the selected path if the second signaling message is accepted by the node of the selected path. If a link failure occurs in the selected path, a protection switching routine is performed by the source node by selecting one of the paths available and sending a third signaling message to the node of the selected path, requesting an increase of the QOS parameter of the selected path to the user-specified level. If the third signaling message is accepted, the source node reestablishes the connection via the selected path. When the failed path is restored, a fault recovery routine begins by sending a fourth signaling message from the source node to the node of the restored path, requesting reservation of the restored path by specifying the QOS parameter of the minimum level. If the fourth signaling message is accepted, the restored path is reestablished. If a session is not restarted between the source and destination users, the protection switching is repeated.

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First Claim