Method and system for inter-technology handoff of a hybrid access terminal
First Claim
1. A method for inter-network handoff of a voice call from a circuit services network to a packet data network, the method comprising:
- conveying forward link voice traffic to, and receiving reverse link voice traffic from, an access terminal via the circuit services network;
determining to hand off the call;
in response to determining to hand off the call and while continuing to support the call, conveying, by a base station of the circuit services network to a wireless packet data node of the packet data network, a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call;
in response to conveying the request, receiving a confirmation from the packet data network to accept the hand-in as a VoIP call;
conveying, by the base station to the access terminal, messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network;
acquiring the access terminal by a base station in the packet data network; and
providing, by the packet data network, the access terminal with packet data services.
4 Assignments
0 Petitions
Accused Products
Abstract
A communication system utilizes an interface terminating at a base station (BS) of a circuit services network and a wireless packet data node in a packet data network and DOS over DBM signaling between the BS and an access terminal (AT), thereby permitting the communication system to tunnel SIP messaging between the AT and an IMS network via the BS and a packet data node and to tunnel HRPD traffic channel information and an HRPD identifier from the packet data network to the AT via the BS. Thus, a handoff of a voice call involving the AT may be initiated from the circuit services network to the packet data networking prior to the AT establishing a call dialogue with the packet data network.
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Citations
41 Claims
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1. A method for inter-network handoff of a voice call from a circuit services network to a packet data network, the method comprising:
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conveying forward link voice traffic to, and receiving reverse link voice traffic from, an access terminal via the circuit services network; determining to hand off the call; in response to determining to hand off the call and while continuing to support the call, conveying, by a base station of the circuit services network to a wireless packet data node of the packet data network, a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call; in response to conveying the request, receiving a confirmation from the packet data network to accept the hand-in as a VoIP call; conveying, by the base station to the access terminal, messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network; acquiring the access terminal by a base station in the packet data network; and providing, by the packet data network, the access terminal with packet data services. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A communication system that provides for inter-network handoff of a voice call from a circuit services network to a packet data network, the system comprising:
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a base station that supports a circuit switched voice call and that is configured to transmit forward link voice traffic to an access terminal via a forward link and receive reverse link voice traffic from the access terminal via a reverse link as part of the circuit switched voice call, determine to hand off the call to the packet data network, in response to determining to hand off the call and while continuing to support the call, convey to a packet data node of the packet data network a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call, in response to conveying the request to handoff, receive a confirmation of the packet data network'"'"'s acceptance of the hand-in as a VoIP call, and convey to the access terminal messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network; and a packet data node of the packet data network that is in communication with the base station and that is configured to receive from the base station the request to hand off the call, in response to receiving the request, convey a confirmation of an acceptance of the hand-in as a VoIP call to the base station, acquire the access terminal, and provide the access terminal with packet data services. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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- 30. A base station that supports a circuit switched voice call and that is configured to transmit forward link voice traffic to an access terminal via a forward link and receive reverse link voice traffic from the access terminal via a reverse link as part of the circuit switched voice call, determine to hand off the call to a packet data network, in response to determining to hand off the call and while continuing to support the call, convey, to a wireless packet data node of the packet data network via an A21 interface terminating at the base station of the circuit services network and packet data node in the packet data network, an A21-Resource Allocation Request message comprising a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call, in response to conveying the request to handoff, receive from the packet data node, via the A21 interface, an A21-Resource Allocation Response message that comprises an access terminal identifier and traffic channel assignment information, and convey to the access terminal messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network.
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34. A base station that supports a circuit switched voice call and that is configured to transmit forward link voice traffic to an access terminal via a forward link and receive reverse link voice traffic from the access terminal via a reverse link as part of the circuit switched voice call, determine to hand off the call to a packet data network, in response to determining to hand off the call and while continuing to support the call, convey, to a wireless packet data node of the packet data network, a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call, in response to conveying the request to handoff, receive from the packet data node a confirmation of an acceptance by the packet data network of a hand-in as a VoIP call, and convey to the access terminal messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network, wherein the base station is configured to receive packet data network air interface signaling from the packet data network and to convey packet data network air interface signaling to the access terminal by conveying a packet data network Data Over Signaling message over a circuit services network Data Burst Message.
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35. A base station that supports a circuit switched voice call and that is configured to transmit forward link voice traffic to an access terminal via a forward link and receive reverse link voice traffic from the access terminal via a reverse link as part of the circuit switched voice call, determine to hand off the call to a packet data network, in response to determining to hand off the call and while continuing to support the call, convey, to a wireless packet data node of the packet data network, a request to hand off the call to the packet data network as a Voice over Internet Protocol (VoIP) call, in response to conveying the request to handoff, receive from the packet data node a confirmation of an acceptance by the packet data network of a hand-in as a VoIP call, convey to the access terminal messaging that includes a packet data traffic channel, information associated with the packet data traffic channel, and a new active set for facilitating a handoff to the packet data network, and to receive Session Initiation Protocol (SIP) messaging from the access terminal using a Data Over Signaling message over a Data Burst Message and to route the SIP messaging to the packet data network via an A21 interface.
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36. A wireless packet data node that supports a packet switched voice call and that is configured to receive, from a base station in a circuit services network, a request to hand off a voice call associated with an access terminal to a packet data network comprising the wireless packet data node as a Voice over Internet Protocol (VoIP) call, in response to receiving the request, conveys a confirmation of acceptance of a hand-in of the call as a VoIP call, acquires the access terminal, and provides the access terminal with packet data services, and further is configured to perform one or more of:
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determine that the access terminal has a packet data session anchored in the packet data network and to determine an access terminal identifier that is associated with a dormant packet data session; and determine that the access terminal does not have a packet data session anchored in the packet data network and to determine an access terminal identifier by assigning, to the access terminal, a previously reserved packet data session and an access terminal identifier. - View Dependent Claims (37, 38, 39, 40)
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41. A wireless packet data node that supports a packet switched voice call and that is configured to receive, from a base station in a circuit services network, a request to hand off a voice call associated with an access terminal to a packet data network comprising the wireless packet data node as a Voice over Internet Protocol (VoIP) call, in response to receiving the request, conveys a confirmation of acceptance of a hand-in of the call as a VoIP call, acquires the access terminal, and provides the access terminal with packet data services, and further s configured to perform one or more of:
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receive, via an A21 interface, an A21-Resource Allocation Request message comprising the request to hand off the call to the packet data network and to convey the confirmation by assembling and conveying an A21-Resource Allocation Response message to the base station via the A21 interface; maintain a pre-configured session state information record and wherein, when the access terminal does not have an anchored packet data session in the packet data network, provide the access terminal with packet data services by providing the access terminal with packet data services based on the maintained session state information record and without first negotiating a session state information record with the access terminal over the air; and receive Proxy-Call Session Control Function discovery messaging from the base station and route the discovery messaging to an Internet Protocol Multimedia Core Network Subsystem.
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Specification