Can't get good signal at my room

Hello, i am having a bit of a trouble to get good signal at my room, the router is placed at the living room and is in front of the hallway, the room that is at the end (2) of the hallway gets excellent signal with very good speed (almost max), but my room (1) which is a little before the room at the end of the hallway doesn't get good signal, sometimes signal dropping on my iphone when i'm in bed.