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Alternate routing by increasing initially low QOS value of a selected alternate path during failure to user-specified value

  • US 5,832,197 A
  • Filed: 12/05/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 12/06/1995
  • Status: Expired due to Fees
First Claim
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1. A connection establishment method for alternate routing in a connection-oriented network in which a plurality of nodes are interconnected by communication links, the method comprising:

  • a) responsive to a connection request from a source user terminal, sending signaling messages from a source node to adjacent nodes, requesting reservation of multiple paths by specifying a QOS (quality of service) parameter of a first level;

    b) responsive to said requesting reservation of multiple paths in a), establishing said multiple paths from said source node to a destination node, wherein said multiple paths are established according to the first level of the QOS parameter;

    c) selecting one of the established paths and sending a signaling message from the source node to a node of the selected path, requesting that the QOS parameter of the selected path be increased from the first level to a level specified by the connection request; and

    d) if the signaling message of (c) is accepted by the node of the selected path, establishing a connection from the source user terminal to a destination user terminal via the selected path.

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