Methods and systems for carrying of call control signaling after handover from an IP packet switched network to a circuit switched cellular network and vice versa
First Claim
1. A method for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
- generating a first message containing call control information, the first message being of an IP-based protocol;
encapsulating the first message into a second message;
transferring the second message to a network element, the network element being part of a circuit switched cellular network;
encapsulating, at the network element, the second message into a third message;
transferring the third message to a gateway;
extracting, at the gateway, the first message from the third message; and
sending the first message to a server in an IP packet switched network, wherein the first message is carried through the circuit switched network transparently.
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Abstract
Methods and systems for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network and vice versa. The IP packet switched network includes a processing server capable of processing IP-based protocol messages. The circuit switched cellular network includes a mobile switching center. A gateway is operatively connected as a bridge between the IP packet switched network and the circuit switched cellular network. The gateway is capable of encapsulating an IP-based protocol message into a payload of a second message, and extracting an IP-based protocol message from a payload of another message. One or more user devices are capable of transmitting and receiving to/from the IP packet switched network and the circuit switched cellular network. The user devices are capable of encapsulating an IP-based protocol message into a payload of a second message, and extracting an IP-based protocol message from a payload of another message. The IP-based protocol message contains call control information that is encapsulated, transparently transferred through the switched cellular network, and extracted. The call control information is transferred between the IP packet switched network and the user device. The circuit switched cellular network may be part of a circuit switched cellular system that also includes an overlayed packet switched network. The call control information may be carried in packets between the IP packet switched network and the user device transparently through the overlayed packet switched network.
33 Citations
47 Claims
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1. A method for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
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generating a first message containing call control information, the first message being of an IP-based protocol;
encapsulating the first message into a second message;
transferring the second message to a network element, the network element being part of a circuit switched cellular network;
encapsulating, at the network element, the second message into a third message;
transferring the third message to a gateway;
extracting, at the gateway, the first message from the third message; and
sending the first message to a server in an IP packet switched network, wherein the first message is carried through the circuit switched network transparently. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22)
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13. A method for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
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generating, at an IP packet switched network, a first message containing call control information, the first message being of an IP-based protocol;
encapsulating, at a gateway, the first message into a second message;
encapsulating, at the gateway, the second message into a third message;
transferring the third message to a network element, the network element being part of a circuit switched cellular network;
transferring the second message to a user device;
extracting, at the user device, the first message from the second message; and
sending the first message to an application at the user device, wherein the first message is carried through the circuit switched network transparently. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 23, 24)
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25. A system for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
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an IP packet switched network, the IP packet switched network including a processing server, the processing server capable of processing IP-based protocol messages;
a network element, the network element being part of a circuit switched cellular network;
a gateway, the gateway operatively connected to the IP packet switched network and the circuit switched cellular network, the gateway capable of encapsulating an IP-based protocol message into a payload of a second message, the gateway further capable of extracting an IP-based protocol message from a payload of another message;
at least one user device, capable of transmitting and receiving to/from the IP packet switched network and the circuit switched cellular network, the at least one user device capable of encapsulating an IP-based protocol message into a payload of a second message, the at least one user device further capable of extracting an IP-based protocol message from a payload of another message, wherein the IP-based protocol message comprises call control information that is encapsulated, transparently carried through the switched cellular network, and extracted, the call control information being carried between the IP packet switched network and the at least one user device. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 35, 36, 37, 38, 39, 40, 41, 42)
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33. A system for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
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a first packet switched network;
a circuit switched cellular system, the circuit switched cellular system comprising a circuit switched cellular network and a second packet switched network;
at least one user device, the at least one user device operatively connected to the IP packet switched network and the circuit switched cellular system, wherein call control information is carried in packets between the IP packet switched network and the at least one user device transparently through the second packet switched network. - View Dependent Claims (34, 43)
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44. An article comprising a storage medium having instructions stored therein, the instructions when executed causing a computing device to perform at least one of:
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generating a first message containing call control information, the first message being of an IP-based protocol;
encapsulating the first message into a second message; and
transferring the second message to a network element, the network element being part of a circuit switched cellular network; and
receiving a second message from a network element, the network element being part of a circuit switched cellular network, the second message containing a first message, the first message containing call control information, the first message being of an IP-based protocol; and
extracting the first message from the second message, wherein the first message is carried between a user device and a packet switched network through the circuit switched cellular network transparently.
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45. An article comprising a storage medium having instructions stored therein, the instructions when executed causing a computing device to perform at least one of:
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receiving a second message from a network element, the network element being part of a circuit switched cellular network, the second message containing a first message, the first message containing call control information, the first message being of an IP-based protocol;
extracting the first message from the second message; and
sending the first message to a server in a packet switched network; and
receiving a first message from a packet switched network, the first message containing call control information, the first message being of an IP-based protocol;
encapsulating the first message into a second message;
encapsulating the second message into a third message; and
carrying the third message to a network element, the network element being part of a circuit switched cellular network, wherein the first message is carried between a user device and a packet switched network through the circuit switched cellular network transparently.
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46. A method for carrying call control information after a call handover from a circuit switched cellular network to an Internet Protocol (IP) packet switched network comprising:
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generating a first message containing call control information, the first message being of a circuit switched protocol;
encapsulating the first message into a second message;
transferring the second message to a server in an IP packet switched network;
transferring the second message to a gateway;
extracting, at the gateway, the first message from the second message; and
sending the first message to a network element, the network element being part of a circuit switched cellular network;
wherein the first message is carried through the packet switched network transparently.
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47. A method for carrying call control information after a call handover from an Internet Protocol (IP) packet switched network to a circuit switched cellular network comprising:
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generating, at a network element, a first message containing call control information, the network element being part of a circuit switched cellular network;
encapsulating, at a gateway, the first message into a second message;
transferring the second message to a server in an IP packet switched network;
transferring the second message to a user device;
extracting, at the user device, the first message from the second message; and
sending the first message to an application at the user device, wherein the first message is carried through the packet switched network transparently.
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Specification