CIRCUIT-SWITCHED AND MULTIMEDIA SUBSYSTEM VOICE CONTINUITY
First Claim
1. A method facilitating domain transfers for a user element simultaneously engaged in a plurality of sessions comprising:
- providing a plurality of session signaling paths for a corresponding plurality of sessions, each of the plurality of session signaling paths comprising a first access signaling leg and a remote access signaling leg for a corresponding one of the plurality of sessions, wherein the first access signaling leg for each of the plurality of session signaling paths is anchored at a control function residing in a multimedia subsystem and extends toward a first user element via a transferring-out domain; and
for each of the plurality of sessions;
providing a second access signaling leg that is anchored at the control function and extends toward the first user element via a transferring-in domain;
replacing the first access signaling leg with the second access signaling leg; and
exchanging session signaling between the second access signaling leg and the remote signaling leg to provide an updated session signaling path to facilitate session signaling for the first user element while the first user element is served by the transferring-in domain.
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Accused Products
Abstract
The present invention relates to moving session control for a user element from a circuit-switched subsystem, such as a cellular network, to a multimedia subsystem (MS), such as the Internet Protocol (IP) Multimedia Subsystem (IMS). Session control is provided by the MS irrespective of whether the user element is using cellular or local wireless access for the sessions. Notably, multiple sessions may be controlled for a given user element at the same time. Session control for originating and terminating multiple simultaneous sessions in the CS or MS as well as transferring these sessions between the CS and MS is anchored at a continuity control function (CCF) in the MS. All session signaling for each of the multiple sessions is passed through the CCF. The CCF is a service provided in the MS, and anchors the user element'"'"'s sessions as well as enables domain transfers between the CS and MS.
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Citations
25 Claims
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1. A method facilitating domain transfers for a user element simultaneously engaged in a plurality of sessions comprising:
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providing a plurality of session signaling paths for a corresponding plurality of sessions, each of the plurality of session signaling paths comprising a first access signaling leg and a remote access signaling leg for a corresponding one of the plurality of sessions, wherein the first access signaling leg for each of the plurality of session signaling paths is anchored at a control function residing in a multimedia subsystem and extends toward a first user element via a transferring-out domain; and for each of the plurality of sessions; providing a second access signaling leg that is anchored at the control function and extends toward the first user element via a transferring-in domain; replacing the first access signaling leg with the second access signaling leg; and exchanging session signaling between the second access signaling leg and the remote signaling leg to provide an updated session signaling path to facilitate session signaling for the first user element while the first user element is served by the transferring-in domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method facilitating domain transfers for a user element simultaneously engaged in a plurality of sessions comprising:
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anchoring at a control function residing in a multimedia subsystem the first access signaling leg for each of a plurality of session signaling paths for a corresponding plurality of sessions, wherein each of the plurality of session signaling paths comprises a first access signaling leg and a remote access signaling leg for a corresponding one of the plurality of sessions, and wherein the first access signaling leg for each of the plurality of session signaling paths extends toward a first user element via a transferring-out domain; and for each of the plurality of sessions; anchoring at the control function a second access signaling leg that extends toward the first user element via a transferring-in domain; replacing the first access signaling leg with the second access signaling leg; and exchanging session signaling between the second access signaling leg and the remote signaling leg to provide an updated session signaling path to facilitate session signaling for the first user element while the first user element is served by the transferring-in domain.
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Specification