For your abroad studies you can choose to spend one or several semesters at other univresities that offers courses within the area maintenance as for example PLX University in Begium. It is also possible to take a study break from your regular education when you study abroad.
In order to keep up with your studies, it is good to choose courses equivalent to the regular LTU courses you would have read if you had still been in Lulea.
If you want credits for required courses, be sure to verify the possibility of this in good time, by discussing concrete course proposals with the relevant examiner at the university. Then your examiner can give you an initial indication of the possibility of crediting before formally chosing courses and submit your application.