Beacon for a road toll system
First Claim
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1. A beacon for a road toll system comprising:
- a transceiver for radio communication with a plurality of vehicle onboard units (OBUs) of the road toll system, wherein the transceiver includes a directional antenna and is configured to receive wirelessly and directionally radio signals from OBUs on a selected channel via the directional antenna,wherein the transceiver further includes an omnidirectional antenna that is configured to receive communication to check whether the selected channel is free, before the beginning of a radio communication by the directional antenna, and wherein the transceiver is further configured to transmit communication only via the omnidirectional antenna and to receive communication only via the directional antenna after checking whether the selected channel is free.
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Abstract
A beacon with a transceiver for radio communication with vehicle OBUs of a road toll system, wherein the transceiver has a directional antenna and is configured to communicate wirelessly with OBUs on a selected channel directed via the directional antenna wherein the transceiver is additionally equipped with an omnidirectional antenna and is configured to transmit, before the beginning of a directional radio communication, by means of the omnidirectional antenna a channel reservation message and/or to check, before the beginning of a directional radio communication, by means of the omnidirectional antenna whether the selected channel is free.
14 Citations
6 Claims
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1. A beacon for a road toll system comprising:
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a transceiver for radio communication with a plurality of vehicle onboard units (OBUs) of the road toll system, wherein the transceiver includes a directional antenna and is configured to receive wirelessly and directionally radio signals from OBUs on a selected channel via the directional antenna, wherein the transceiver further includes an omnidirectional antenna that is configured to receive communication to check whether the selected channel is free, before the beginning of a radio communication by the directional antenna, and wherein the transceiver is further configured to transmit communication only via the omnidirectional antenna and to receive communication only via the directional antenna after checking whether the selected channel is free. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification