Paging for circuit switched fallback (CSFB) in long term evolution (LTE) connected mode
First Claim
1. A method to respond to paging messages by a mobile wireless device, the method comprising:
- by the mobile wireless device;
receiving, from a first wireless network, a paging message that uniquely identifies the mobile wireless device, originates from a second wireless network, and is not a public warning system message; and
when an internal state of the mobile wireless device indicates the mobile wireless device is connected to the first wireless network, after receiving the paging message;
disconnecting the mobile wireless device from the first wireless network by;
releasing a first radio resource control (RRC) connection to the first wireless network locally in the mobile wireless device,establishing a second RRC connection between the mobile wireless device and the first wireless network,sending an extended service request message to the first wireless network, the extended service request message indicating a positive circuit switched fallback (CSFB) response to the paging message, andreceiving a signaling message from the first wireless network, the signaling message indicating release of the second RRC connection and redirection of the mobile wireless device to the second wireless network, and establishing a connection of the mobile wireless device to the second wireless network.
1 Assignment
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Accused Products
Abstract
Methods, apparatuses and computer readable media are described that analyze and communicate signaling messages between a mobile wireless device and a wireless access network to realize a circuit switched fallback (CSFB) procedure when the mobile wireless device is initially in a radio resource control connected mode with the wireless network. A set of information elements of a paging message is analyzed, and based on contents of the set of information elements and an internal state of the mobile wireless device, connections between the mobile wireless device and first and second wireless access networks are changed to realize the CSFB procedure.
19 Citations
15 Claims
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1. A method to respond to paging messages by a mobile wireless device, the method comprising:
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by the mobile wireless device; receiving, from a first wireless network, a paging message that uniquely identifies the mobile wireless device, originates from a second wireless network, and is not a public warning system message; and when an internal state of the mobile wireless device indicates the mobile wireless device is connected to the first wireless network, after receiving the paging message; disconnecting the mobile wireless device from the first wireless network by; releasing a first radio resource control (RRC) connection to the first wireless network locally in the mobile wireless device, establishing a second RRC connection between the mobile wireless device and the first wireless network, sending an extended service request message to the first wireless network, the extended service request message indicating a positive circuit switched fallback (CSFB) response to the paging message, and receiving a signaling message from the first wireless network, the signaling message indicating release of the second RRC connection and redirection of the mobile wireless device to the second wireless network, and establishing a connection of the mobile wireless device to the second wireless network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method to respond to paging messages by a mobile wireless device, the method comprising:
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by the mobile wireless device; receiving, from a first wireless network, a paging message that uniquely identifies the mobile wireless device, originates from a second wireless network, and is not a public warning system message; and when an internal state of the mobile wireless device indicates the mobile wireless device is connected to the first wireless network, after receiving the paging message; disconnecting the mobile wireless device from the first wireless network by; sending a first extended service request message to the first wireless network, the first extended service request message indicating a first positive circuit switched fallback (CSFB) response to the paging message; when receiving a first signaling message from the first wireless network in response to the first extended service request message, the first signaling message redirecting the mobile wireless device to the second wireless network, releasing a first radio resource control (RRC) connection of the mobile wireless device to the first wireless network; and when not receiving the first signaling message from the first wireless network in response to the first extended service request message; releasing the first RRC connection of the mobile wireless device to the first wireless network, establishing a second RRC connection to the first wireless network, sending a second extended service request message to the first wireless network indicating a second positive CSFB response to the paging message, receiving a second signaling message from the first wireless network in response to the second extended service request message redirecting the mobile wireless device to the second wireless network, and in response to receiving the second signaling message, releasing the second RRC connection of the mobile wireless device to the first wireless network.
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9. A mobile wireless device comprising:
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one or more processors configured to control establishing and releasing connections between the mobile wireless device and a first wireless network and a second wireless network; one or more transmitters configured to transmit signals to the first wireless network according to a first wireless communication protocol and to the second wireless network according to a second wireless communication protocol; and one or more receivers configured to receive signals from the first and second wireless networks; wherein the one or more processors are further configured to cause the mobile wireless device to; receive, from the first wireless network, a paging message that uniquely identifies the mobile wireless device, originates from the second wireless network, and is not a public warning system message; and when an internal state of the mobile wireless device indicates that the mobile wireless device is connected to the first wireless network upon receipt of the paging message; disconnect the mobile wireless device from the first wireless network by; releasing a first radio resource control (RRC) connection to the first wireless network locally in the mobile wireless device, establishing a second RRC connection between the mobile wireless device and the first wireless network, sending an extended service request message to the first wireless network, the extended service request message indicating a positive circuit switched fallback (CSFB) response to the paging message, and receiving a signaling message from the first wireless network, the signaling message indicating release of the second RRC connection and redirection of the mobile wireless device to the second wireless network; and establish a connection of the mobile wireless device to the second wireless network. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification