Abstract: A method of exchanging messages between a railroad communications system radio operating in accordance with a host-radio exchange protocol and a railroad messaging system. A communications manager of the railroad messaging system, operating in accordance with the host-radio exchange protocol, transmits a request to the radio requesting registration as a host of the radio. The communications manager is selectively registered with the radio as a primary host. The radio sends a message to the primary host identifying an available wireless link between the radio and another radio of the railroad communications system. Data messages, which include data being exchanged between the primary host and the primary host of the another radio across the wireless link, are exchanged between the radio and the primary host in accordance with the host-radio exchange protocol.

Abstract: A method of exchanging messages between a railroad communications system radio operating in accordance with a host-radio exchange protocol and a railroad messaging system. A communications manager of the railroad messaging system, operating in accordance with the host-radio exchange protocol, transmits a request to the radio requesting registration as a host of the radio. The communications manager is selectively registered with the radio as a primary host. The radio sends a message to the primary host identifying an available wireless link between the radio and another radio of the railroad communications system. Data messages, which include data being exchanged between the primary host and the primary host of the another radio across the wireless link, are exchanged between the radio and the primary host in accordance with the host-radio exchange protocol.

Abstract: A communication device including a receiver for receiving information via a first radio protocol directly from a first communication device concerning at least a second radio protocol; and a controller for controlling communication of the communication device in dependence upon the received information.

Abstract: A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a target device and includes facilities to activate a location-indicating transmission in a target device, the ability to request that a location-indicating transmission be activated in a remote target device, relevant information reception from a target device and the display of all potential target devices within effective transmission range of the wireless communication device.

Abstract: A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a target device and includes facilities to activate a location-indicating transmission in a target device, the ability to request that a location-indicating transmission be activated in a remote target device, relevant information reception from a target device and the display of all potential target devices within effective transmission range of the wireless communication device.

Abstract: A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a target device and includes facilities to activate a location-indicating transmission in a target device, the ability to request that a location-indicating transmission be activated in a remote target device, relevant information reception from a target device and the display of all potential target devices within effective transmission range of the wireless communication device.

Abstract: A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a target device and includes facilities to activate a location-indicating transmission in a target device, the ability to request that a location-indicating transmission be activated in a remote target device, relevant information reception from a target device and the display of all potential target devices within effective transmission range of the wireless communication device.

Abstract: A system for indicating the relative direction of a target object or location as determined from the current position of a wireless communication device. The system employs Direction of Arrival determination using an antenna array for indicating the direction of a target device and includes facilities to activate a location-indicating transmission in a target device, the ability to request that a location-indicating transmission be activated in a remote target device, relevant information reception from a target device and the display of all potential target devices within effective transmission range of the wireless communication device.

Abstract: A low power radio device, operable in a first radio system, comprising: a detector for detecting the polarization of an antenna of a further radio device, operating in a further radio system, different to the first radio system; and a transmitter for controlling the polarization of a transmitted radio signal in dependence on the detected polarization. The polarization of the transmitted signal may be controlled to be substantially orthogonal to the polarization of the antenna of the further radio device.