The present invention relates to a method for measuring a location of a radio frequency identification (RFID) reader by using beacons, and an RFID system for measuring a location of a moving RFID reader in an RFID system comprising: a plurality of beacon devices for emitting beacons; an RFID tag for transmitting pre-stored information by using radio frequency identification; and an RFID reader for calculating a current location using a plurality of at least three beacons wherein the RFID reader receives the plurality of beacons from the plurality of beacon devices while moving, and receiving the information from the RFID tag by using the radio frequency identification. According to the present invention, it is possible to increase the accuracy of the location measurement of a moving RFID reader in an RFID system because the location of the RFID reader is measured in consideration of propagation environments.

The present invention relates to a method for measuring a location of a radio frequency identification (RFID) reader by using beacons, and an RFID system for measuring a location of a moving RFID reader in an RFID system comprising: a plurality of beacon devices for emitting beacons; an RFID tag for transmitting pre-stored information by using radio frequency identification; and an RFID reader for calculating a current location using a plurality of at least three beacons wherein the RFID reader receives the plurality of beacons from the plurality of beacon devices while moving, and receiving the information from the RFID tag by using the radio frequency identification. According to the present invention, it is possible to increase the accuracy of the location measurement of a moving RFID reader in an RFID system because the location of the RFID reader is measured in consideration of propagation environments.

Systems and methods for transmitting beacon messages are described. A beacon message is transmitted from a first beacon device and broadcast to an area within a transmission range of the first beacon device. A mobile device receives and stores the message. When the mobile device is out of the range of the first beacon device and within the range of a second beacon device, the message is transmitted to the second beacon device and broadcast by the second beacon device.

Systems and methods for transmitting beacon messages are described. A beacon message is transmitted from a first beacon device and broadcast to an area within a transmission range of the first beacon device. A mobile device receives and stores the message. When the mobile device is out of the range of the first beacon device and within the range of a second beacon device, the message is transmitted to the second beacon device and broadcast by the second beacon device.

A method and devices are disclosed, for localization of a radio beacon at a remote receiver in the framework of a satellite system. Such satellite system could be Cospas-Sarsat, for Search and Rescue of people, ships and aircraft in distress, and particularly its MEOSAR (Medium Earth Orbit Search and Rescue) segments: DASS/GPS, SAR/Galileo and SAR/Glonass; said beacon is typically one of a PLB (Personal Locator Beacon) or EPIRB (Emergency Position Indicating Radio Beacon) or ELT (Emergency Locator Beacon); and said remote receiver is typically a MEOLUT (Medium Earth Orbit Local User Terminal) base station. Present art MEOSAR localization is based on Time measurements and Frequency measurements on signals emitted by radio beacons, relayed by satellites and detected at a MEOLUT; however since the exact time of transmission of the beacon is unknown at the MEOLUT, Time Difference of Arrival (TDOA) equations are applied. The present invention however, discloses that by carefully configuring the time of transmission at said beacon, even without directly communicating that specific time to the MEOLUT, Time of Arrival (TOA) equations could be applied at the MEOLUT enabling enhanced localization accuracy and/or fewer satellites in view required to localize the beacon. In particular, localization is enabled even upon a single burst emitted by the beacon and relayed to the MEOLUT by a single satellite.

A data expansion system that provides for wireless communication includes a set of roadway communication devices configured to enable vehicle-to-vehicle (V2V) communication. The system includes a first roadway communication device configured to receive data from a first electronic device in a first vehicle and a second roadway communication device communicatively coupled to the first roadway device. The second roadway communication device is configured to communicate the data to a second electronic device in a second vehicle. Each roadway communication device includes a wireless transceiver to transmit and receive data; a communication interface to establish communication links with other roadway communication devices; and processing circuitry to relay the data between the other roadway communication devices or electronic devices in respective vehicles. Each roadway communication device also includes a housing that contains the processing circuitry, communication interface and the wireless transceiver. The housing is configured to be mounted within a roadway surface.

A data expansion system that provides for wireless communication includes a set of roadway communication devices configured to enable vehicle-to-vehicle (V2V) communication. The system includes a first roadway communication device configured to receive data from a first electronic device in a first vehicle and a second roadway communication device communicatively coupled to the first roadway device. The second roadway communication device is configured to communicate the data to a second electronic device in a second vehicle. Each roadway communication device includes a wireless transceiver to transmit and receive data; a communication interface to establish communication links with other roadway communication devices; and processing circuitry to relay the data between the other roadway communication devices or electronic devices in respective vehicles. Each roadway communication device also includes a housing that contains the processing circuitry, communication interface and the wireless transceiver. The housing is configured to be mounted within a roadway surface.

A data expansion system that provides for wireless communication includes a set of roadway communication devices configured to enable vehicle-to-vehicle (V2V) communication. The system includes a first roadway communication device configured to receive data from a first electronic device in a first vehicle and a second roadway communication device communicatively coupled to the first roadway device. The second roadway communication device is configured to communicate the data to a second electronic device in a second vehicle. Each roadway communication device includes a wireless transceiver to transmit and receive data; a communication interface to establish communication links with other roadway communication devices; and processing circuitry to relay the data between the other roadway communication devices or electronic devices in respective vehicles. Each roadway communication device also includes a housing that contains the processing circuitry, communication interface and the wireless transceiver. The housing is configured to be mounted within a roadway surface.

A data expansion system that provides for wireless communication includes a set of roadway communication devices configured to enable vehicle-to-vehicle (V2V) communication. The system includes a first roadway communication device configured to receive data from a first electronic device in a first vehicle and a second roadway communication device communicatively coupled to the first roadway device. The second roadway communication device is configured to communicate the data to a second electronic device in a second vehicle. Each roadway communication device includes a wireless transceiver to transmit and receive data; a communication interface to establish communication links with other roadway communication devices; and processing circuitry to relay the data between the other roadway communication devices or electronic devices in respective vehicles. Each roadway communication device also includes a housing that contains the processing circuitry, communication interface and the wireless transceiver. The housing is configured to be mounted within a roadway surface.

A locational information transmission apparatus that transmits information for identifying a location is provided. The locational information transmission apparatus includes a radio communication unit that performs radio communication; a sound wave transmitting unit that transmits a sound wave including first identification information; a radio wave transmitting unit that transmits a radio wave including second identification information; and a transmission control unit that changes, depending on control information reported via the radio communication, a method of transmitting the sound wave or a method of transmitting the radio wave.