Method and apparatus for controlling the operation of a terminal device

According to one aspect there is provided a method in an apparatus in a first network operating according to a first radio access technology, RAT, the method comprising evaluating (101) parameters and/or rules for a terminal device as part of an access network selection, traffic steering and/or traffic aggregation procedure between the first network and a second network operating according to a second RAT; starting (103) a timer if the parameters and/or rules are satisfied; and adjusting (105) the operation of the timer in the event that a change or potential change to the parameters and/or rules occurs prior to expiry of the timer.