US 7,804,395 B2Granted

Mobile radio communication system

AssigneeKabushiki Kaisha Toyota Chuo

InventorsJunya Muramatsu, Satoshi Makido, Junji Imai, Kenji Ito, Yukihiro Tadokoro

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Abstract

A mobile radio communication system estimates the positional relationship between an own moving terminal and another moving terminal around a view obstruction. If the absolute value of the difference between detected reception power levels is lower than a first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being shorter than a predetermined distance BP, or that the other moving terminal is positioned outside thereof, the distance to the visual range of the own moving terminal being shorter than the predetermined distance BP. Also if the absolute value is higher than or equal to the first power threshold value, the own moving terminal determines in a similar manner.

Claims9

Dependent claims

A mobile radio communication system estimating the positional relationship between the own moving terminal and the other moving terminal around a view obstruction,

wherein the other moving terminal serves as a transmitting station in the mobile radio communication system and includes a transmission antenna having a predetermined transmission power level and a predetermined mounting height,
wherein the own moving terminal serves as a receiving station in the mobile radio communication system and includes
two reception antennas having different mounting heights, the mounting height of one reception antenna being different from that of the other reception antenna by a certain value or higher;
reception power level detecting means for detecting the reception power level of a signal transmitted from the transmission antenna of the other moving terminal for every reception antenna;
and
absolute value determining means for determining whether the absolute value of the difference between the detected reception power levels is lower than a first power threshold value,
wherein, if the absolute value is lower than the first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being shorter than a predetermined distance BP, or that the other moving terminal is positioned outside the visual range of the own moving terminal, the distance to the visual range of the own moving terminal being shorter than the predetermined distance BP, and
wherein, if the absolute value is higher than or equal to the first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being longer than or equal to the predetermined distance BP, or that the other moving terminal is positioned outside the visual range of the own moving terminal, the distance to the visual range of the own moving terminal being longer than or equal to the predetermined distance BP.

5 more elements

A mobile radio communication system estimating the positional relationship between the own moving terminal and the other moving terminal around a view obstruction,

wherein the other moving terminal serves as a transmitting station in the mobile radio communication system and includes a transmission antenna having a predetermined transmission power level and a predetermined mounting height,
wherein the own moving terminal serves as a receiving station in the mobile radio communication system and includes
three or more reception antennas having different mounting heights;
reception power level detecting means for detecting the reception power level of a signal transmitted from the transmission antenna of the other moving terminal for every reception antenna;
distance storing means for storing a predetermined distances BP corresponding to each of the reception antennas excluding at least the reception antenna having the highest mounting height;
and
absolute value determining means for selecting arbitrary two reception antennas from the three or more reception antennas to determine whether the absolute value of the difference between the reception power levels of the selected reception antennas is lower than a first power threshold value,
wherein, if the absolute value is lower than the first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being shorter than the predetermined distance BP corresponding to the reception antenna having the lower mounting height among the selected reception antennas, or that the other moving terminal is positioned outside the visual range of the own moving terminal, the distance to the visual range of the own moving terminal being shorter than the predetermined distance BP, and
wherein, if the absolute value is higher than or equal to the first power threshold value, the own moving terminal determines that the other moving terminal is positioned within the visual range of the own moving terminal, the distance from the own moving terminal to the other moving terminal being longer than or equal to the predetermined distance BP, or that the other moving terminal is positioned outside the visual range of the own moving terminal, the distance to the visual range of the own moving terminal being longer than or equal to the predetermined distance BP.

6 more elements

Dependencies are inferred from the claim text.