Patent ID: 9338717
Filing Date: 2016-05-10
CPC Classification: H04W

Claim Text:
1. A method for wireless communications by a multi-mode user equipment (UE), comprising: measuring a first time period during a first attempt of establishing an emergency call in a first radio access technology (RAT) network; using a configurable parameter to determine a number of times the UE may retry the emergency call in the first RAT network after expiration of the first time period without establishing the emergency call or after a failed attempt of the emergency call during the first time period; measuring a second time period during a first retry of the emergency call in the first RAT network, wherein the first and second time periods are based on a time required to send less than a configured maximum number of retries for a normal call; and switching to a second RAT network if the UE fails in establishing the emergency call in the first RAT network after retrying the determined number of times.