Adding a service control channel after session establishment
First Claim
1. A method of operating an Internet Protocol based multimedia subsystem (IMS) comprising:
- establishing a first IMS session between a first user element and a second user element, the first IMS session having;
at least a portion of an overall bearer path being a circuit-switched (CS) bearer path that extends through a CS access network to the first user element; and
a remote signaling leg that extends from the IMS toward the second user element;
after the first IMS session is established, establishing an initial service control signaling channel for the first IMS session, wherein the service control signaling channel is for providing IMS services for the first user element, the service control channel extending from the IMS toward the first user element;
associating the service control signaling channel with the remote signaling leg; and
providing an IMS service for the first IMS session to the first user element via the service control signaling channel and to the second user element via the remote signaling leg.
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Accused Products
Abstract
For an IMS session that employs a CS bearer path that supports a local user element for at least a portion of the overall bearer path, the present invention provides for establishing and using the IMS session without providing a service control signaling channel when the IMS session is initially established. After the IMS session is established and supporting communications between the local and remote user elements, a service control signaling channel for the local user element may be established and associated with the IMS session to facilitate IMS services requiring service control signaling. Before or when a service is invoked, the local user element, the network, or an agent thereof may establish the service control signaling channel wherein the IMS will associate the service control signaling channel with the current IMS session and employ service control signaling over the service control signaling channel to facilitate IMS services.
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Citations
31 Claims
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1. A method of operating an Internet Protocol based multimedia subsystem (IMS) comprising:
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establishing a first IMS session between a first user element and a second user element, the first IMS session having; at least a portion of an overall bearer path being a circuit-switched (CS) bearer path that extends through a CS access network to the first user element; and a remote signaling leg that extends from the IMS toward the second user element; after the first IMS session is established, establishing an initial service control signaling channel for the first IMS session, wherein the service control signaling channel is for providing IMS services for the first user element, the service control channel extending from the IMS toward the first user element; associating the service control signaling channel with the remote signaling leg; and providing an IMS service for the first IMS session to the first user element via the service control signaling channel and to the second user element via the remote signaling leg. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A service node providing a service in an Internet Protocol based multimedia subsystem (IMS) comprising:
- at least one communication interface; and
a control system associated with the at least one communication interface and configured to;establish a first IMS session between a first user element and a second user element, the first IMS session having; at least a portion of an overall bearer path being a circuit-switched (CS) bearer path that extends through a CS access network to the first user element; and a remote signaling leg that extends from the IMS toward the second user element; after the first IMS session is established, establish an initial service control signaling channel for the first IMS session, wherein the service control signaling channel is for providing IMS services for the first user element, the service control channel extending from the IMS toward the first user element; associate the service control signaling channel with the remote signaling leg; and
provide an IMS service for the first IMS session to the first user element via the service control signaling channel and to the second user element via the remote signaling leg. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
- at least one communication interface; and
Specification