System and method for call handoff between circuit switched and packet data wireless networks
First Claim
1. A method of hand off from a serving one of a packet data or circuit switched wireless network to a target one of the networks, for a hybrid mobile terminal capable of communications through both networks and engaged in an existing call through the serving wireless networks, comprising:
- receiving a new call from the mobile terminal through the target wireless network, the new call having a predetermined called party identifier;
in response to the called party identifier, routing the new call back to the mobile terminal through the serving wireless network; and
connecting the existing call to the mobile terminal through the target wireless network.
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Accused Products
Abstract
The hybrid mobile terminal is engaged in an existing call through a serving one of a circuit switched or packet data wireless networks. The mobile terminal places a new call through the target one of the wireless networks, the new call having a predetermined called party identifier. In response to the called party identifier, the call is converted to a loop-back call directed to the mobile terminal through the serving wireless network, establishing a call path through the target wireless network. The mobile terminal accepts the loop-back call, and directs the existing call to connect to the call path through the target wireless network. The existing call through the original network is then dropped, effecting an inter-system handoff from the serving to the target wireless network.
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Citations
24 Claims
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1. A method of hand off from a serving one of a packet data or circuit switched wireless network to a target one of the networks, for a hybrid mobile terminal capable of communications through both networks and engaged in an existing call through the serving wireless networks, comprising:
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receiving a new call from the mobile terminal through the target wireless network, the new call having a predetermined called party identifier;
in response to the called party identifier, routing the new call back to the mobile terminal through the serving wireless network; and
connecting the existing call to the mobile terminal through the target wireless network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of handing off a hybrid mobile terminal, operative to communicate through both packet data and circuit switched wireless networks, from a serving one of such networks initially carrying an existing call to a target one of such networks, comprising:
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generating a new call, having a predetermined called party identifier, through the target wireless network;
accepting a loop-back call through the serving wireless network; and
in response to the loop-back call, continuing the existing call through the target wireless. - View Dependent Claims (9, 10, 11, 12)
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13. A circuit switched wireless network, comprising:
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a subscriber database maintaining a plurality of subscriber profiles and at least one fictitious subscriber profile having a predetermined Mobile Directory Number (MDN) and identifying a call directed to the predetermined MDN as a handoff loop-back call; and
a network node operative to redirect a handoff loop-back call to the mobile terminal that originated the call. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A packet data wireless network, comprising:
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a Public Service Identifier Application Server (PSI-AS) operative to redirect a handoff loop-back call to the mobile terminal that originated the call;
a network node operative to receive a Initial Address Message (IAM) from a circuit switched wireless network, the IAM having a predetermined Mobile Directory Number (MDN) as the called party identifier, and further operative to convert the called party identifier from the predetermined MDN to the sip;
uri address of the PSI-AS. - View Dependent Claims (22, 23, 24)
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Specification