US 12,127,295 B2
Method to reduce emergency call set-up
Arun Ashok Tagare, Hyderabad (IN); Mudit Singh, Hyderabad (IN); and Abhishek Shukla, Hyderabad (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 23, 2022, as Appl. No. 17/652,215.
Prior Publication US 2023/0269830 A1, Aug. 24, 2023
Int. Cl. H04W 76/50 (2018.01); H04W 36/12 (2009.01); H04W 76/10 (2018.01)
CPC H04W 76/50 (2018.02) [H04W 36/125 (2018.08); H04W 76/10 (2018.02)] 24 Claims
OG exemplary drawing
 
1. An apparatus for wireless communication at a user equipment (UE), comprising:
memory; and
at least one processor coupled to the memory and configured to:
transmit, to a network entity, a request to set up an emergency packet data network (ePDN);
receive, from the network entity, a response to the request comprising a set of multiple proxy-call session control function (P-CSCF) addresses;
transmit, from the UE to the network entity, a registering message to each of the multiple P-CSCF addresses simultaneously to attempt to establish an emergency call connection via each of the multiple P-CSCF addresses simultaneously;
receive, from the network entity, a plurality of acceptance messages from a subset of the set of multiple P-CSCF addresses based on the registering message; and
transmit, to the network entity, an invitation message to one of the subset of the set of multiple P-CSCF addresses to establish the emergency call connection.