Wireless communication system, fixed base station and mobile terminal station
First Claim
1. A wireless communication system comprising:
- a plurality of base stations separated from each other by a predetermined distance along a traveling route of a vehicle and having respective communication areas; and
a terminal station carried by a vehicle for wireless communication with the base stations when entering the communication areas of the base stations, wherein each communication area of the base stations is sized to cover generally only one vehicle to exist therein and the communication areas are separated from one another without overlapping, wherein;
data is dividedly transmitted in the communication areas of the base stations existing along a traveling direction of the vehicle in case that transmission of the data to the terminal station is not completed within the communication area of each base station;
the terminal station includes data storage means for accumulating the data transmitted dividedly; and
the data storage means has a data storage capacity which is more than a value R×
T which is a product of R and T, R representing playing data rate at the terminal station and T (=L/v) representing non-data transmission time determined by a velocity v at which the terminal station moves between adjacent communication areas divisionally transmitting the data and the distance L between the adjacent communication areas.
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Accused Products
Abstract
A radio communication system between a mobile terminal station of a vehicle and a plurality of roadside fixed base stations is so constructed that communication areas of the base stations do not overlap with each other and satisfy the following two conditions. Condition (i): each communication area is defined so that there cannot be a plurality of terminal stations simultaneously. Condition (ii): it is needless to perform multiple access such as time division in the communication area and capable of affording the whole band and all the communication time allocated to one communication area to one terminal station and broad band communication becomes possible. Thus, each mobile terminal station can utilize all the frequency band allocated for service.
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Citations
39 Claims
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1. A wireless communication system comprising:
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a plurality of base stations separated from each other by a predetermined distance along a traveling route of a vehicle and having respective communication areas; and
a terminal station carried by a vehicle for wireless communication with the base stations when entering the communication areas of the base stations, wherein each communication area of the base stations is sized to cover generally only one vehicle to exist therein and the communication areas are separated from one another without overlapping, wherein;
data is dividedly transmitted in the communication areas of the base stations existing along a traveling direction of the vehicle in case that transmission of the data to the terminal station is not completed within the communication area of each base station;
the terminal station includes data storage means for accumulating the data transmitted dividedly; and
the data storage means has a data storage capacity which is more than a value R×
T which is a product of R and T, R representing playing data rate at the terminal station and T (=L/v) representing non-data transmission time determined by a velocity v at which the terminal station moves between adjacent communication areas divisionally transmitting the data and the distance L between the adjacent communication areas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless communication system comprising:
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a plurality of base stations separated from each other by a predetermined distance along a traveling route of a vehicle and having respective communication areas; and
a terminal station carried by a vehicle for wireless communication with the base stations when entering the communication areas of the base stations, wherein each communication area of the base stations is sized to cover generally only one vehicle to exist therein and the communication areas are separated from one another without overlapping, wherein;
the base station transmits the carrier wave for forming the communication area to an area where a frequency of the carrier wave received by the terminal station of the vehicle moving on the traveling route does not vary in discontinuity by means of Doppler effect, and the base station further transmits the carrier wave from approximately right below an antenna of the base station in only one of a traveling direction of the vehicle arid an opposite direction from the traveling direction of the vehicle along the traveling route of the vehicle.
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22. A wireless communication system comprising:
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a plurality of base stations separated from each other by a predetermined distance along a traveling route of a vehicle and having respective communication areas; and
a terminal station carried by a vehicle for wireless communication with the base stations when entering the communication areas of the base stations, wherein each communication area of the base stations is sized to cover generally only one vehicle to exist therein and the communication areas are separated from one another without overlapping, wherein;
the number of communication areas of the base stations on the traveling route is set to satisfy the following condition,
E>
10^{−
(GtSA−
GtCN)/10}where E is an effective communication section ratio, GtSA is an antenna gain of the base station and GtCN is an antenna gain of the base station of continuous access method in which the communication areas overlap with each other, with “
^”
in the above expression being the power of numeric value before “
^”
to the number of times of the numeric value after “
^”
.
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23. A base station for wireless communication with a terminal station carried by a vehicle entering a communication area thereof, wherein:
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the base station is separated from adjacent ones by a predetermined distance along a traveling route of the vehicle; and
the communication area of the base station is sized to cover generally only one vehicle to exist therein and the communication area is separated from communication areas of adjacent communication areas without overlapping, wherein;
data is dividedly transmitted in the communication area of the base station existing along a traveling direction of the vehicle in case that transmission of the data to the terminal station is not completed within the communication area of each base station; and
the number of communication areas of the base stations along the traveling route satisfies the following condition,
E≧
RaREQ/RaSA
(condition)where E is an effective communication section ratio, RaREQ is a data transmission rate necessary for utilizing the data without interruption at the terminal station, and RaSA is the data transmission rate from the base station to the terminal station. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A base station A base station for wireless communication with a terminal station carried by a vehicle entering a communication area thereof, wherein:
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the base station is separated from adjacent ones by a predetermined distance alone a traveling route of the vehicle; and
the communication area of the base station is sized to cover generally only one vehicle to exist therein and the communication area is separated from communication areas of adjacent communication areas without overlapping, wherein;
the base station transmits the carrier wave for forming the communication area to an area where a frequency of the carrier wave received by the terminal station of the vehicle moving on the traveling route does not vary in discontinuity by means of Doppler effect, and the base station further transmits the carrier wave from approximately right below an antenna of the base station in only one of a traveling direction of the vehicle and an opposite direction from the traveling direction of the vehicle along the traveling route of the vehicle.
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32. A base station for wireless communication with a terminal station carried by a vehicle entering a communication area thereof, wherein:
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the base station is separated from adjacent ones by a predetermined distance along a traveling route of the vehicle; and
the communication area of the base station is sized to cover generally only one vehicle to exist therein and the communication area is separated from communication areas of adjacent communication areas without overlapping, wherein;
the number of communication areas of the base stations on the traveling route is set to satisfy the following condition,
E>
10^{−
(GtSA−
GtCN)/10}where E is an effective communication section ratio, GtSA is an antenna gain of the base station and GtCN is an antenna gain of the base station of continuous access method in which the communication areas overlap with each other, with “
^”
in the above expression being the power of numeric value before “
^”
to the number of times of the numeric value after “
^”
. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A terminal station carried by a vehicle for wireless communication with a plurality of base stations separated from each other by a predetermined distance along a traveling route of the vehicle and capable of divisionally receiving given data from the plurality of base stations, the terminal station comprising:
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data storage means for accumulating the data transmitted divisionally from the base stations, wherein the data storage means has a data storage capacity which is more than a value R×
T which is a product of R and T, R representing a data rate used for transmission of the data at the terminal station and T(=L/v) representing non-data transmission time determined by a velocity v at which the terminal station moves between adjacent communication areas divisionally transmitting the data and the distance L between the adjacent communication areas.
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Specification