Roadside communication device and road-to-vehicle communication method
AssigneeMitsubishi Electric Corporation
InventorsTadashi OSHIMA, Nobuhiro SUZUKI, Yoshiaki TSUDA, Takafumi YOKOE
Life of this patent
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Abstract
Determination is made as to whether or not to enable communications by a communication processing unit with an on-board unit, on the basis of a receive strength detected from a radio wave received via a communication antenna, and the angle of arrival and the receive strength of a direct wave and the angle of arrival and the receive strength of a reflected wave, the angles of arrival and the receive strengths being estimated from one or more radio waves received via an angle measurement antenna.
Claims6
A roadside communication device connected to a first antenna used for communications with an on-board unit, and to a second antenna used for estimating angles of arrival of radio waves, the roadside communication device comprising:
- processing circuitry
- to detect a receive strength of a radio wave received via the first antenna from a first on-board unit;
- to estimate an angle of arrival and a receive strength of a direct wave and an angle of arrival and a receive strength of a reflected wave, the direct wave and the reflected wave being included in one or more radio waves received via the second antenna from one or more on-board units;
- and
- to determine whether or not to enable communications with the first on-board unit, using the first antenna, on a basis of the detected receive strength, and the estimated angles of arrival and the estimated receive strengths of the direct and reflected waves of the one or more radio waves,
- wherein if the detected receive strength exceeds a reference value, and if the estimated angle of arrival of either the direct wave or reflected wave of the radio wave shows an arrival from a communication area, then the processing circuitry determines that communications with the first on-board unit are enabled.
A roadside communication device connected to an array antenna, comprising:
- processing circuitry
- to combine radio waves received via multiple element antennas, which constitute the array antenna, from a first on-board unit and detect a receive strength of the combined radio waves;
- to estimate an angle of arrival and a receive strength of a direct wave and an angle of arrival and a receive strength of a reflected wave, the direct wave and the reflected wave being included in one or more radio waves received via the multiple element antennas from one or more on-board units;
- and
- to determine whether or not to enable communications with the first on-board unit, using the array antenna, on a basis of the detected receive strength, and the estimated angles of arrival and the estimated receive strengths of the direct and reflected waves of the one or more radio waves,
- wherein if the detected receive strength exceeds a reference value, and if the estimated angle of arrival of either the direct wave or reflected wave of the radio wave shows an arrival from a communication area, then the processing circuitry determines that communications with the first on-board unit are enabled.
A road-to-vehicle communication method for a roadside communication device connected to a first antenna used for communications with an on-board unit, and a second antenna used for estimating an angle of arrival of a radio wave, the road-to-vehicle communication method comprising:
- detecting a receive strength of a radio wave received via the first antenna from a first on-board unit;
- estimating an angle of arrival and a receive strength of a direct wave and an angle of arrival and a receive strength of a reflected wave, the direct wave and the reflected wave being included in one or more radio waves received via the second antenna from one or more on-board units;
- determining whether or not to enable communications with the first on-board unit, using the first antenna, on a basis of the detected receive strength, and the estimated angles of arrival and the estimated receive strengths of the direct and reflected waves of the one or more radio waves;
- determining that communications with the first on-board unit are enabled, if the detected receive strength exceeds a reference value, and if the estimated angle of arrival of either the direct wave or reflected wave of the radio wave shows an arrival from a communication area;
- and
- communicating with the first on-board unit via the first antenna in accordance with the determined result.
Dependencies are inferred from the claim text.