CPC H04W 36/0022 (2013.01) [H04W 48/18 (2013.01); H04W 76/18 (2018.02); H04W 76/38 (2018.02); H04W 76/50 (2018.02)] | 13 Claims |
1. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a user equipment (UE), the one or more processors to configure the UE to, execute the instructions to:
for a service request procedure that includes initiation of a service request:
when a T3325 timer is not running:
initiate transmission of the service request to a network and initiate a T3417 timer;
increment a service request attempt counter when a response to the service request has not been received from the network before expiration of the T3417 timer and user data is non-emergency user data; and
initiate the T3325 timer when the service request attempt counter at least meets a predetermined value; and
when the T3325 timer is running and the service request was initiated for a non-emergency multimedia telephony (MMTEL) call:
notify upper layers that the service request was not accepted, and
receive a request from the upper layers to establish a circuit switched (CS) voice call when not already attempted in a CS domain.
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