Deactivating elevated priority public data network connections in user equipment

1. A method comprising:

in a user equipment:

establishing a non-elevated priority cellular data connection;

establishing an elevated priority cellular data connection;

identifying a deactivation criterion for deactivating the elevated priority cellular data connection;

obtaining a periodic timing value from the operator network;

determining that the deactivation criterion is satisfied, the deactivation criterion comprising expiration of a timer maintained according to the periodic timing value; and

when the elevated and non-elevated priority data connections are active upon determining the deactivation criterion is satisfied:

locally deactivating, by user equipment, the elevated priority data connection including removing an indication of the elevated priority data connection from the user equipment.

2. The method of claim 1 , where locally deactivating the elevated priority data connection in the user equipment comprises: removing a data entry associated with the elevated priority data connection from a connection data structure maintained by the user equipment.

3. The method of claim 1 , further comprising:

sending a deactivation indication for the elevated priority data connection to an operator network after deactivating the elevated priority data connection.

4. The method of claim 3 , where sending the deactivation indication comprises: initiating a registration procedure with the operator network indicating that the elevated priority data connection has been locally deactivated.

5. The method of claim 1 , where determining that the deactivation criterion is satisfied comprises: determining that a threshold time has elapsed since establishing of the elevated priority data connection.

6. The method of claim 1 , where determining that the deactivation criterion is satisfied comprises: determining that a threshold time has elapsed since a voice call was performed over the elevated priority data connection.

7. The method of claim 1 , where determining that the deactivation criterion is satisfied comprises: determining that the elevated priority data connection has been inactive for longer than an inactivity time threshold.

8. The method of claim 1 , where the elevated priority data connection comprises an emergency data connection.

9. A device comprising:

a memory storing a deactivation criterion the deactivation criterion comprising pre-specified operational conditions for deactivation of a data connection; and

system logic circuitry in communication with the memory, the system logic circuitry configured to:

read the deactivation criterion from the memory;

establish a non-elevated priority cellular data connection with an operator network;

establish an elevated priority cellular data connection with the operator network;

obtain a periodic timing value from the operator network;

determine that the deactivation criterion is satisfied while the elevated and non-elevated priority data connections are active, the deactivation criterion comprising expiration of a timer maintained according to the periodic timing value, and in response:

locally deactivate the elevate priority data connection while maintaining the non-elevated priority cellular data connection, wherein the deactivation comprises removal of an indication of the elevated priority data connection from the memory of the device.

10. The device of claim 9 , where the system logic circuitry is configured to deactivate the elevate priority data connection while maintaining the non-elevated priority data connection by:

communicating to the operator network that the elevated priority data connection has been deactivated and that the non-elevated priority data connection has not been deactivated.

11. The device of claim 9 , where the deactivation criterion is satisfied when a threshold time has elapsed since the elevated priority data connection was established.

12. The device of claim 9 , where the deactivation criterion is satisfied when the elevated priority data connection has been inactive for longer than an inactivity time threshold.

13. A device comprising:

a communication interface for cellular communications; and

system logic circuitry in communication with the communication interface, the system logic circuitry configured to:

obtain a periodic timer value from an operator network through the communication interface;

establish an emergency public data network (PDN) connection with the operator network through the communication interface;

maintain a timer based on the periodic timer value obtained from the operator network;

determine that the emergency PDN connection and at least one non-emergency PDN connection are active upon expiration of the timer, and in response:

locally deactivate the emergency PDN connection; and send a deactivation indication to the operator network that the emergency PDN connection has been locally deactivated.

14. The device of claim 13 , where the system logic circuitry is configured to send the deactivation notification by:

transmission of a periodic tracking area request message to the operator network.

15. The device of claim 14 , where the periodic tracking area request message indicates the emergency PDN connection is inactive and that the at least one non-emergency PDN connection is active.

16. The device of claim 13 , where the system logic circuitry is configured to send the deactivation indication to the operator network by: establishment of a non-emergency connection with the operator network to send the deactivation indication.

17. The device of claim 13 , where the system logic circuitry is configured to send the deactivation indication to allow the operator network to synchronize deactivation of the emergency PDN connection on the operator network.