Invention Grant
- Patent Title: Mobile terminating call retry logic for multiple radio access technology types
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Application No.: US16694628Application Date: 2019-11-25
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Publication No.: US11277717B2Publication Date: 2022-03-15
- Inventor: Sabuhi Kiran Zaifuddin , Shujaur Rehman Mufti , Saqib Badar
- Applicant: T-Mobile USA, Inc.
- Applicant Address: US WA Bellevue
- Assignee: T-Mobile USA, Inc.
- Current Assignee: T-Mobile USA, Inc.
- Current Assignee Address: US WA Bellevue
- Agency: Lee & Hayes, P.C.
- Main IPC: H04W4/16
- IPC: H04W4/16 ; H04W40/24 ; H04W76/19 ; H04W8/04
Abstract:
An Internet Protocol Multimedia Subsystem (IMS) application server can initially attempt to route a terminating call invite to a user equipment (UE) via a packet-switched (PS) domain radio access network (RAN). However, if that initial attempt fails, the application server can follow either a PS retry option to reattempt routing the terminating call invite via a PS-domain RAN, or a circuit-switched (CS) retry option to instead reattempt routing the terminating call invite via a CS-domain RAN. In some examples, if Home Subscriber Server (HSS) data indicates that the UE is connected to a Long-Term Evolution (LTE) RAN and that CS-domain location information for the UE is older than a threshold, the application server can enable the PS retry option. However, if the UE is connected to an LTE RAN but the CS-domain location information is more recent than the threshold, the application server can instead enable the CS retry option.
Public/Granted literature
- US20210160666A1 MOBILE TERMINATING CALL RETRY LOGIC FOR MULTIPLE RADIO ACCESS TECHNOLOGY TYPES Public/Granted day:2021-05-27
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