Circuit-switched and multimedia subsystem voice continuity with bearer path interruption
First Claim
1. A method comprising:
- providing a signaling anchor point in a multimedia subsystem for a first access signaling leg and a remote access signaling leg for a voice call between a user element and a remote endpoint over a bearer path, the first access signaling leg provided for the user element via a transferring-out subsystem;
establishing a second access signaling leg toward a user element via a transferring-in subsystem;
replacing the first access signaling leg with the second access signaling leg, such that the second access signaling leg is anchored at the signaling anchor point; and
providing call signaling via the second access signaling leg and the remote signaling leg to transfer at least a portion of the bearer path connected to the user element from the transferring-out subsystem to the transferring-in subsystem, wherein one of the transferring-in subsystem and the transferring-out subsystem is the multimedia subsystem that supports the voice call over a packet session, and another of the transferring-in subsystem and the transferring out subsystem is a circuit-switched subsystem that supports the voice call over a circuit-switched connection.
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Accused Products
Abstract
The present invention maintains calls during transfers between different types of subsystems, even when there is a bearer path interruption at the user element due to the original connection from the transferring-out subsystem being dropped before the new connection in the transferring-in subsystem is established. The call signaling leg toward the remote endpoint of the remote party is held, while the call signaling leg toward the user element is moved from the transferring-out subsystem to the transferring-in subsystem and a new bearer path is established via the transferring-in subsystem. During transfers with a bearer path interruption, a portion of the bearer path leading to the remote endpoint may be connected to a media resource function, which will provide an announcement to the remote party. Once the user element is accessible in the transferring-in subsystem, the bearer path is further transferred to the user element via the transferring-in subsystem.
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Citations
28 Claims
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1. A method comprising:
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providing a signaling anchor point in a multimedia subsystem for a first access signaling leg and a remote access signaling leg for a voice call between a user element and a remote endpoint over a bearer path, the first access signaling leg provided for the user element via a transferring-out subsystem;
establishing a second access signaling leg toward a user element via a transferring-in subsystem;
replacing the first access signaling leg with the second access signaling leg, such that the second access signaling leg is anchored at the signaling anchor point; and
providing call signaling via the second access signaling leg and the remote signaling leg to transfer at least a portion of the bearer path connected to the user element from the transferring-out subsystem to the transferring-in subsystem, wherein one of the transferring-in subsystem and the transferring-out subsystem is the multimedia subsystem that supports the voice call over a packet session, and another of the transferring-in subsystem and the transferring out subsystem is a circuit-switched subsystem that supports the voice call over a circuit-switched connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A service node comprising:
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a communication interface; and
a control system associated with the communication interface and adapted to;
provide a signaling anchor point in a multimedia subsystem for a first access signaling leg and a remote access signaling leg for a voice call between a user element and a remote endpoint over a bearer path, the first access signaling leg provided for the user element via a transferring-out subsystem;
establish a second access signaling leg toward a user element via a transferring-in subsystem;
replace the first access signaling leg with the second access signaling leg, such that the second access signaling leg is anchored at the signaling anchor point; and
provide call signaling via the second access signaling leg and the remote signaling leg to transfer at least a portion of the bearer path connected to the user element from the transferring-out subsystem to the transferring-in subsystem, wherein one of the transferring-in subsystem and the transferring-out subsystem is the multimedia subsystem that supports the voice call over a packet session, and another of the transferring-in subsystem and the transferring out subsystem is a circuit-switched subsystem that supports the voice call over a circuit-switched connection. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification