Transfer of emergency services session between disparate subsystems
First Claim
1. A method comprising:
- providing a signaling anchor point at a domain transfer function in a visited multimedia subsystem for a first access signaling leg and a remote access signaling leg for an emergency services session between a user element and a public service access point, the first access signaling leg provided for the user element via a transferring-out subsystem;
establishing a second access signaling leg for the emergency services session toward the 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 a bearer path of the emergency services session that is connected to the user element from the transferring-out subsystem to the transferring-in subsystem.
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Accused Products
Abstract
Session control for emergency services sessions (E-sessions) originating in a circuit-switched subsystem (CS) or a multimedia subsystem (MS) is provided by the visited MS and is anchored at a domain transfer function (DTF), which is a service provided by a visited MS that is currently serving the user. As such, all call signaling for the E-session is passed through the DTF. The DTF enables efficient and effective subsystem transfers of the E-session between the CS and MS, while maintaining the E-session between the user element and the PSAP. The DTF may also provide to the PSAP location information bearing on the location of the user element when the E-session is established as well as provide updated location information when transfers between the CS and MS occur.
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Citations
23 Claims
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1. A method comprising:
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providing a signaling anchor point at a domain transfer function in a visited multimedia subsystem for a first access signaling leg and a remote access signaling leg for an emergency services session between a user element and a public service access point, the first access signaling leg provided for the user element via a transferring-out subsystem; establishing a second access signaling leg for the emergency services session toward the 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 a bearer path of the emergency services session that is connected to the user element from the transferring-out subsystem to the transferring-in subsystem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A node for providing a continuity control function 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 at a domain transfer function in a visited multimedia subsystem for a first access signaling leg and a remote access signaling leg for an emergency services session between a user element and a public service access point, the first access signaling leg provided for the user element via a transferring-out subsystem; establish a second access signaling leg for the emergency services session 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 a bearer path of the emergency services session that is connected to the user element from the transferring-out subsystem to the transferring-in subsystem. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification