CALL CONTROL SYSTEM, CALL CONTROLLER, TERMINAL DEVICE, AND CALL CONTROL METHOD
First Claim
1. A call control system comprising a call controller for performing a call control by selectively using a plurality of communication networks and a plurality of terminal devices, the call controller comprising:
- a receiving-side terminal device current state monitoring unit for acquiring from a terminal device on a receiving side available network data representing a communication network available to the terminal device on the receiving side;
an available network data holding unit for holding the available network data acquired by the receiving-side terminal device current state monitoring unit; and
a call control unit for, upon receipt of a reception request from the terminal device on the receiving side, concurrently transmitting call control signals each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the available network data holding unit, and for, upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, determining a communication network to be used by the terminal device on the receiving side based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order,each of the plurality of terminal devices comprising;
a communication unit for communicating with the exterior; and
a terminal-side call control unit for, when the communication unit receives the call control signals concurrently transmitted through the plurality of communication networks, respectively, estimated by the call controller to be available to the terminal device on the receiving side, returning a call response including the communication resource information together with the identifier through each of the plurality of communication networks to the call controller.
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Accused Products
Abstract
There is provided a call control system, a call controller, a terminal device, and a call control method of this type, whereby a communication network to be used by a terminal device on the receiving side is determined in an efficient manner to allow communication promptly, in a communication where plural communication networks are selectively used. On receipt of a reception request from the terminal device 220 on the receiving side, call control signals are concurrently transmitted, each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the holding, and upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, a communication network to be used by the terminal device on the receiving side is determined based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order.
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Citations
11 Claims
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1. A call control system comprising a call controller for performing a call control by selectively using a plurality of communication networks and a plurality of terminal devices, the call controller comprising:
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a receiving-side terminal device current state monitoring unit for acquiring from a terminal device on a receiving side available network data representing a communication network available to the terminal device on the receiving side; an available network data holding unit for holding the available network data acquired by the receiving-side terminal device current state monitoring unit; and a call control unit for, upon receipt of a reception request from the terminal device on the receiving side, concurrently transmitting call control signals each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the available network data holding unit, and for, upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, determining a communication network to be used by the terminal device on the receiving side based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order, each of the plurality of terminal devices comprising; a communication unit for communicating with the exterior; and a terminal-side call control unit for, when the communication unit receives the call control signals concurrently transmitted through the plurality of communication networks, respectively, estimated by the call controller to be available to the terminal device on the receiving side, returning a call response including the communication resource information together with the identifier through each of the plurality of communication networks to the call controller. - View Dependent Claims (2, 3, 4)
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5. A call controller, for performing a call control by selectively using a plurality of communication networks, adaptable to a call control system comprising the call controller and a plurality of terminal devices, the call controller comprising:
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a receiving-side terminal device current state monitoring unit for acquiring from a terminal device on a receiving side available network data representing a communication network available to the terminal device on the receiving side; an available network data holding unit for holding the available network data acquired by the receiving-side terminal device current state monitoring unit; and a call control unit for, upon receipt of a reception request from the terminal device on the receiving side, concurrently transmitting call control signals each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the available network data holding unit, and for, upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, determining a communication network to be used by the terminal device on the receiving side based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order. - View Dependent Claims (6, 7, 8)
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9. A terminal device to be adaptable to a call control system comprising a plurality of the terminal devices and a call controller for performing a call control by selectively using a plurality of communication networks, the terminal device comprising:
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a communication unit for communicating with the exterior; and a terminal-side call control unit for, when the communication unit receives call control signals concurrently transmitted through the plurality of communication networks, respectively, estimated by the call controller to be available to the terminal device on a receiving side, returning a call response including communication resource information together with a prescribed identifier through each of the plurality of communication networks to the call controller. - View Dependent Claims (10)
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11. A call control method in a call control system comprising a call controller for performing a call control by selectively using a plurality of communication networks and a plurality of terminal devices, the call control method comprising:
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in the call controller, acquiring from a terminal device on a receiving side available network data representing a communication network available to the terminal device on the receiving side; holding the available network data acquired by the monitoring; and Upon receipt of a reception request from the terminal device on the receiving side, concurrently transmitting call control signals each having a call identifier for identifying a call to the plurality of communication networks, respectively, estimated to be available to the terminal device on the receiving side, based upon the available network data held by the holding, and upon receipt of each of call responses to the call control signals concurrently transmitted, from each of the plurality of communication networks, determining a communication network to be used by the terminal device on the receiving side based upon call control condition information representing a condition relating to the call control and communication resource information included in a single call response received in a relatively early order, in each of the plurality of terminal devices, communicating with the exterior; and when the communicating receives the call control signals concurrently transmitted through the plurality of communication networks, respectively, estimated by the call controller to be available to the terminal device on the receiving side, returning a call response including the communication resource information together with the identifier through each of the plurality of communication networks to the call controller.
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Specification