CLAIMS
1. An antenna control device (10a) to control a plurality
of antennas (Hi to H5) used for communicating with a
mobile station that moves along a predetermined path in a
radio communication system that includes a plurality of
linear cells, each of which is formed by the antennas (Hi
to llb) and in each of which each of the antennas (Hi to
H5) sets a directionality in a same direction as a path of
the mobile station and transmits an identical signal at an
identical frequency, and that has two frequencies
recurrently allocated in such a manner that adjacent linear
cells use different frequencies for transmission, wherein
the antenna control device (10a) adjusts, in each of the linear cells, power distribution to each of the antennas (Hi to 115) that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to 115) .
2. The antenna control device (10a) according to claim 1, wherein the antenna control device (10a) determines power distribution to each of the antennas (Hi to II5) in accordance with a communication condition.
3. The antenna control device (10b) according to claim 1 or 2, wherein the antenna control device (10b) selects at least one of the antennas (Hi to 115) that form the linear cell and allocates power to the selected antenna such that power distribution is gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to 115) .
4. The antenna control device (10b) according to claim 3, wherein, the antenna control device '(10b) allocates power to
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an antenna within a range of which a mobile station is located and an antenna adjacent to the antenna within a range of which the mobile station is located.
5. The antenna control device according to claim 1, wherein in each of the linear cells, the antenna control device adjusts power distribution to each of the antennas (12i to 125) that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas (12i to 125) and adjusts a depression angle (9i to 65) of each of the antennas (12i to 125) that form the linear cell so as to be gradually increased with distance in a direction of antenna directionality of each of the antennas (12i to 125) .
6. An antenna control device (10b) to control a plurality of antennas (Hi to II5) used for communicating with a mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas (Hi to II5) and in each of which each of the antennas (Hi to lis) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an
o
identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, wherein
the antenna control device (10b) selects and allocates, in each of the linear cells, power to at least one of the antennas (Hi to 115) that form the linear cell, and allocates power to the selected antennas such that power is gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to II5) .
5J§0

7. The antenna control device (10a) according to claim 6, wherein the antenna control device (10a) determines a selection of the antennas (Hi to II5) in accordance with a communication condition.
8. An antenna control device to control a plurality of antennas (12i to 125) used for communicating with a mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear
o
cells, each of which is' formed by the antennas (12i to 125) and in each of which each of the antennas (12i to 125) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, wherein
the antenna control device adjusts, in each of the linear cells, a depression angle (61 to 65) of each of the antennas (12i to 125) that form the linear cell so as to be gradually increased with distance in a direction of antenna directionality of each of the antennas (12i to 125) .
9. The antenna control device according to claim 8, wherein
the antenna control device determines a depression angle
(9i to 95) of each of the antennas (12i to 125) in
accordance with a communication condition.
10. The antenna control device (10a) according to claim 2, 7, or 9, wherein the communication condition is at least one of weather and a required communication speed.
11. An antenna adjustment method of adjusting a plurality of antennas (Hi to II5) used for communicating with a
31

mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas (Hi to II5) and in each of which each of the antennas (Hi to lis) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies
o
recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, the method comprising adjusting, in each of the linear cells, power distribution to each of the antennas (Hi to H5) that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to H5) .
12. The antenna adjustment method according to claim 11, comprising determining power distribution to each of the antennas (Hi to H5) in accordance with a communication condition.
13. An antenna adjustment method of adjusting a plurality of antennas (Hi to H5) used for communicating with a mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas (Hi to 115) and in each of which each of the antennas (Hi to lis) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, the method comprising selecting and allocating, in each of the linear cells, power to at least one of the antennas (Hi to
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115) that form the linear cell, and allocating power to the selected antennas such that power is gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to lis) •
14. The antenna adjustment method according to claim 13, comprising determining a selection of the antennas (Hi to lis) in accordance with a communication condition.
15. An antenna adjustment method of adjusting a plurality of antennas (12i to 125) used for communicating with a
o
mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas (12i to 125) and in each of which each of the' antennas (12i to 125) sets a directionality in a same direction as a path of the mobile station and transmits and receives an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission and reception, the method comprising adjusting in each of the linear cells, a depression angle (9i to 05) of each of the antennas (12i to 125) that form the linear cell so as to be gradually increased with distance in a direction of antenna directionality of each of the antennas (12x to 125) .
16. The antenna adjustment method according to claim 15, comprising determining a depression angle (0i to 95) of each of the antennas (12i to 125) in accordance with a communication condition.
17. The antenna adjustment method according to claim 12, 14,
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or 16, wherein the communication condition is at least one of weather and a required communication speed.
18. A distributed antenna system to form a radio
communication system that includes a plurality of linear
cells, each of which is formed by a plurality of antennas
(Hi to II5) used for communicating with a mobile station
that moves along a predetermined path and in each of which
each of the antennas (Hi to 115) sets a directionality in
a same direction as a path of the mobile station and
transmits an identical signal at an identical frequency,
and that has two frequencies recurrently allocated in such
a manner that adjacent linear cells use different
frequencies for transmission, wherein
the distributed antenna system sets, in each of the linear cells, power distribution to each of the antennas (Hi to 115) that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to II5) .
19. The distributed antenna system according to claim 18, wherein the distributed antenna system determines power distribution to each of the antennas (Hi to II5) in accordance with a communication condition.
20. A distributed antenna system to form a radio communication system that includes a plurality of linear cells, each of which is formed by a plurality of antennas (Hi to 115) used for communicating with a mobile station
that moves along a predetermined path and in each of which each of the antennas (Hi to II5) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency,
9™§

and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, wherein
the distributed antenna system allocates, in each of the linear cells, power to at least one of the antennas (Hi to II5) that form the linear cell as a target, and allocates power to the antenna to which power is to be allocated such that power is gradually decreased with distance in a direction of antenna directionality of each of the antennas (Hi to II5) .
21. The distributed antenna system according to claim 20, wherein the distributed antenna system determines power allocation to the antennas (Hi to II5) in accordance with a communication condition.
22. A distributed antenna system to- form a radio communication system that includes a plurality of linear cells, each of which is formed by a plurality of antennas (12i to 125) used for communicating with a mobile station that moves along a predetermined path and in each of which each of the antennas (12i to 125) sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission, wherein
the distributed antenna system sets, in each of the linear cells, a depression angle (0i to 95) of each of the antennas (12i to 125) that form the linear cell so as to be gradually increased with distance in a direction of antenna directionality of each of the antennas (12i to 125) .
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23. The distributed antenna system according to claim 22, wherein the distributed antenna system determines a depression angle (9i to 95) of each of the antennas (12i to 125) in accordance with a communication condition.
24. The distributed antenna system according to claim 19, 21, or 23, wherein the communication condition is at least one of weather and a required communication speed.
Dated this 16 day of February 2017
(RRNair)
Reg.No.: IN/PA- 121
Of De Penning & De Penning
Agent for the Applicants

ABSTRACT An antenna control device 10a controls a plurality of antennas Hi to H5 used for communicating with a mobile station that moves along a predetermined path in a radio communication system that includes a plurality of linear cells, each of which is formed by the antennas and in each of which each of the antennas sets a directionality in a same direction as a path of the mobile station and transmits an identical signal at an identical frequency, and that has two frequencies recurrently allocated in such a manner that adjacent linear cells use different frequencies for transmission. The 'antenna control device adjusts, in each of the linear cells, power distribution to each of the antennas that form the linear cell so as to be gradually decreased with distance in a direction of antenna directionality of each of the antennas.