Have to call a method in interval of 15 min, 30min 1 hr ,2 hr and 5 hr to update content. Best way

Question

I have to call a method to update the db which exposed by the some sdk, Now I have confusion to choose concept to do this. Should I go with :

• UILocalNotification
  • Background Fetch
  • Timer (Won't be good idea I guess)

Please, suggest.