US 11,877,193 B2
Enhanced internet protocol multimedia subsystem call handling
Nitin Kuppelur, Bangalore (IN); Deepak Dash, Khordha (IN); Robert Zaus, Munich (DE); Shashanka Totadamane Ramappa, Shimoga (IN); and Vivek G. Gupta, San Jose, CA (US)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Dec. 19, 2022, as Appl. No. 18/084,262.
Application 18/084,262 is a continuation of application No. 16/645,278, granted, now 11,576,086, previously published as PCT/US2018/058958, filed on Nov. 2, 2018.
Claims priority of provisional application 62/587,649, filed on Nov. 17, 2017.
Prior Publication US 2023/0119871 A1, Apr. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 36/00 (2009.01); H04W 76/18 (2018.01); H04W 76/38 (2018.01); H04W 76/50 (2018.01); H04W 48/18 (2009.01)
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
OG exemplary drawing
 
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.