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US 11,146,994 B2Granted
Method and apparatus for handling circuit switched calls at a user equipment
AssigneeBlackBerry Limited
InventorsHamid Syed Mahmood, Mathurin Wadjeu
Life of this patent
Estimating the term…
Abstract
A method at a user equipment including detecting that a circuit switched (CS) call has been requested at the user equipment; if a most recent registration attempt or registration update attempt with a network of a first radio access technology (RAT) resulted in an abnormal state, registering with a network of a second RAT; and initiating the CS call with the network of the second RAT.
Claims21
A method at a user equipment comprising:
- detecting that a voice call has been requested at the user equipment;
- determining that a registration attempt or registration update attempt with a network of a first radio access technology (RAT) is in an abnormal state;
- after determining that a last successful network registration information matches current registration information received from a network of a second RAT, registering with the network of the second RAT, wherein the registering with the network of the second RAT is in a form of a second registration update;
- and
- initiating the voice call with the network of the second RAT.
2 more elements
A user equipment comprising:
- a communications subsystem;
- and
- a processor;
- wherein the communications subsystem and the processor cooperate to:
- detect that a voice call has been requested at the user equipment;
- determine that a registration attempt or registration update attempt with a network of a first radio access technology (RAT) is in an abnormal state;
- after determining that a last successful network registration information matches current registration information received from a network of a second RAT, register with the network of the second RAT, wherein the registering with the network of the second RAT is in a form of a second registration update;
- and
- initiate the voice call with the network of the second RAT.
6 more elements
A non-transitory computer-readable medium for storing instruction code which, when executed by a processor of a user equipment cause the user equipment to:
- detect that a voice call has been requested at the user equipment;
- determine that a registration attempt or registration update attempt with a network of a first radio access technology (RAT) is in an abnormal state;
- after determining that a last successful network registration information matches current registration information received from a network of a second RAT, register with the network of the second RAT, wherein the registering with the network of the second RAT is in a form of a second registration update;
- and
- initiate the voice call with the network of the second RAT.
2 more elements
Dependencies are inferred from the claim text.