Switching active subscriber identity of a communication terminal

摘要

A method is disclosed of switching the active subscriber identity of a communication terminal which is capable at each moment in time of having only one active subscriber identity. An active subscriber identity switch from a first subscriber identity to a second subscriber identity is initiated. At least one parameter associated with a time of expiry of a timer associated with the first subscriber identity is stored. The first subscriber identity is deactivated and the second subscriber identity is activated. If an active subscriber identity switch from the second subscriber identity to the first subscriber identity is initiated and the first subscriber identity is activated, it may be determined whether the time of expiry of the timer associated with the first subscriber identity has passed. Network registration of the first subscriber identity may be performed only if the time of expiry of the timer associated with the first subscriber identity has passed. Corresponding computer program product, controller, arrangement and communication terminal are also disclosed.

主权项

1. A method of switching active subscriber identity of a communication terminal, wherein the communication terminal is capable at each moment in time of having only one active subscriber identity, the method comprising:
maintaining, while a first subscriber identity is active and registered, a first periodic timer associated with the first subscriber identity; initiating an active subscriber identity switch from the first subscriber identity to a second subscriber identity and maintaining the first subscriber identity as registered; stopping the first periodic timer in response to the initiation of the active subscriber identity switch; storing a timer value based on a time when the first periodic timer is stopped; de-activating the first subscriber identity; activating the second subscriber identity; initiating an active subscriber identity switch from the second subscriber identity to the first subscriber identity; de-activating the second subscriber identity; and activating the first subscriber identity, wherein the step of activating the first subscriber identity comprises:
determining, based on at least the stored timer value, whether a time of expiry of the first timer has passed; andperforming network registration of the first subscriber identity if the time of expiry of the first timer has passed while the first subscriber identity is non-active.