Patent ID: 6801762
Filing Date: 2004-10-05
Classification: H04W

Abstract:
Apparatus for facilitating completion of an emergency call placed at a mobile station by a user, the mobile station being operable in a first radio communication system in which a first set of channels are utilized in placement of the emergency call and the mobile station being operable in at least a second radio communication system in which at least a second set of channels are utilized in placement of the emergency call, a preferred list of channels selected from at least one of the first set and the second set, utilized by the mobile station first to attempt the completion of the emergency call, said apparatus comprising:a determiner coupled to receive indications of attempts to complete the emergency call, said determiner for determining whether a prior attempt to complete the emergency call was successful; a selector coupled to said determiner at least to receive indications of determinations made by said determiner of non-successful completion of the emergency call through utilization of the preferred list of channels, said selector operable responsive thereto to select at least one additional channel to be utilized by the mobile station to attempt the completion of the emergency call, the at least one additional channel selected from the first set and the second set and which is not contained in the preferred list of channels; and a call attemptor coupled to said selector, said call attemptor being operable responsive to selection made by said selector, said call attemptor for initiating placement of the emergency call responsive to the selection made by said selector and, subsequent to a user-caused, call-attempt termination, for attempting to acquire a most-recently utilized communication system of the first and at least second radio communication systems.