Systems and methods for an in-vehicle base station are described. In one embodiment, a method is disclosed, comprising: permitting a mobile device to attach to the mobile base station; attaching, at the mobile base station, to a macro cell for providing backhaul to the mobile device using the mobile base station for access; receiving a first tracking area code from the macro cell; transmitting a second tracking area code to the mobile device, the second tracking area code corresponding to a tracking area managed by a coordinating node; detecting, at the mobile base station, a transition from a stationary state to a moving state of the mobile base station; and sending a tracking area update message to a core network to transition to the tracking area managed by the coordinating node.