There is provided an information acquisition method to be executed by a mobile station, connected to a first radio access network of a first radio access technology, to perform acquisition of an information set related to a second radio access network of a second, different radio access technology for enabling mobility to the second radio access network. Basically, the method comprises receiving (S1) message instances, wherein a set of the message instances includes the information set for enabling mobility to the second radio access network. The method further comprises investigating (S2) the message instances to find counter information in a message instance indicating the number of message instances the mobile station must acquire to assemble the information set. The method also comprises identifying (S3), in relation to the message instance in which the counter information is found, the set of message instances that includes the information set based on the counter information. The method then comprises collecting (S4) the information set from the identified set of message instances.