公开(公告)号：US11317325B2

公开(公告)日：2022-04-26

申请号：US15994250

申请日：2018-05-31

Applicant: APPLE INC.

Inventor： Sundarraman Balasubramanian ,  Vijay Venkataraman ,  Nordine Kadri ,  Alistair McFarlane

IPC: H04W36/00 ,  H04L29/06 ,  H04W76/18 ,  H04L12/26 ,  H04W36/26 ,  H04L65/1016 ,  H04L65/1069 ,  H04L43/16 ,  H04W60/00

Abstract: A device, system, and method improve a call setup time. The method is performed at a device configured to establish first and second network connections where the second network performs circuit switched voice calls. The method includes receiving a call input to perform a call and determining whether the device is registered with a first feature to perform the call based on an Internet Protocol (IP). When the device is registered with the first feature, the method includes determining whether timeouts for attempting previous IP calls is greater than a threshold. When the timeouts are at least the threshold, the method includes deregistering from the first feature and performing a circuit switched fallback (CSFB) procedure including a handover from the first network to the second network. The method includes performing the call as a circuit switched call.

公开(公告)号：US10111154B1

公开(公告)日：2018-10-23

申请号：US15701722

申请日：2017-09-12

Applicant: Apple Inc.

Inventor： Sundarraman Balasubramanian ,  Nordine Kadri ,  Omar Ali ,  Vijay Venkataraman

IPC: H04W48/02 ,  H04W48/16

Abstract: Techniques are disclosed relating to a mobile device blacklisting certain wireless cells. The device may refrain from considering blacklisted cells for cell operations such as reselection and handover. The device may blacklist cells that fail selection criteria or system information decoding. In some embodiments, the device is configured to manage inclusion of cells on the blacklist based on whether the cells are part of a home network (e.g., an HPLMN) for the mobile device. The device may delete cells that are part of the home network from the blacklist after an out-of-service event or may refrain from adding cells from the home network to the blacklist after certain failures, for example. In various embodiments the disclosed techniques may avoid blacklisting desirable cells in certain scenarios while still enabling blacklist functionality. This may improve wireless performance and battery life, for example.