Abstract: A method and apparatus are used for a vehicle and for communicating with a personal communications device. The method includes establishing a secured communication link between the vehicle and the personal communications device for a first operation of accessing and/or starting the vehicle. The method further includes reusing the secured communication link for an application of the vehicle additional to the first operation.

Abstract: Methods and apparatuses for secure communication between a first and a second communication partner are provided. The method for secure communication between a first and a second communication partner comprises establishing a communication link between the first and the second communication partner. Further, the method comprises determining one or more session identifiers by one of the first and the second communication partner. The method additionally comprises communicating the one or more session identifiers to the other of the first and the second communication partner. The method comprises determining, for each of the one or more session identifiers, a respective symmetric session key in each of the first and the second communication partner. In addition, the method comprises storing the one or more session identifiers and the corresponding symmetric session keys in each of the first and the second communication partner for one or more subsequent secure communication sessions.

Abstract: Embodiments relate to a method for accessing a functionality of a vehicle via a mobile device. The method includes sending, using a first radio access technology, RAT, a ranging intent message from the mobile device to the vehicle; initiating, by the vehicle and using a second RAT, a ranging session for localizing the mobile device upon receipt of the ranging intent message; and upon initiating the ranging session, sending a ranging response message from the vehicle to the mobile device using the first RAT, the ranging response message indicating whether the mobile device is inside or outside at least one operational localization range of the vehicle.