WE CLAIM:
1. A wireless communication apparatus comprising:
a channel-usage selection unit to select one frequency channel for each time slot from a plurality of predetermined candidate frequency channels; and
a wireless communication unit to perform wireless communication by using the frequency channel selected by the channel-usage selection unit, wherein
the channel-usage selection unit selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in a same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than number of the candidate frequency channels, from a cell used for the wireless communication.
2. The wireless communication apparatus according to claim 1, wherein a cell interval between a cell used by the wireless communication unit for the wireless communication and a cell that uses the same frequency channel in all time slots is greater than the number of the candidate frequency channels.
3. The wireless communication apparatus according to claim 1 or 2, wherein the channel-usage selection unit uses a frequency channel interval between the time slots and an offset between cells to determine the frequency channel to be used.

4. The wireless communication apparatus according to claim 3, wherein the channel-usage selection unit uses two different frequency channel intervals between the time slots, and uses an offset between cells to extract a plurality of the frequency channels for each of the time slots, and select one of the frequency channels on a basis of a quality value indicating communication quality of each of the frequency channels.
5. The wireless communication apparatus according to any one of claims 1 to 4, wherein the wireless communication apparatus is located along a predetermined path, and is any one of plural base stations, each of which forms the cell, or is a mobile station moving along the path, and the wireless communication is performed between the base station and the mobile station positioned within a cell formed by the corresponding base station.
6. The wireless communication apparatus according to claim 5, wherein
the wireless communication apparatus is the base station, and
the channel-usage selection unit uses a frequency channel interval between the time slots and an offset between cells, the frequency channel interval and the offset being allocated to each of the base stations in advance, to select the frequency channel to be used.
7. The wireless communication apparatus according to
claim 5, wherein
the wireless communication apparatus is the mobile station, and
the channel-usage selection unit obtains a frequency

channel interval between the time slots and an offset between cells, the frequency channel interval and the offset being allocated to each of the base stations in advance by the base station that is a counterpart device for the wireless communication, and uses the obtained frequency channel interval between the time slots and the obtained offset between cells to select the frequency channel to be used.
8. The wireless communication apparatus according to
claim 4, wherein
the wireless communication apparatus is a base station that forms the cell, and
the wireless communication unit notities selection information indicating the frequency channel selected for each of the time slots by the channel-usage selection unit to a mobile station positioned within the cell formed by the base station.
9. The wireless communication apparatus according to claim 5, wherein the path is a railway track, and the mobile station is installed in a train running on the railway track.
10. The wireless communication apparatus according to claim 1, wherein the channel-usage selection unit includes a table of a hopping pattern in which a frequency channel to be used for each of the time slots is set, and selects the frequency channel to be used in accordance with the table.
11. A wireless communication system comprising:
a base station located along a predetermined path; and

a mobile station positioned within a cell formed by the base station and moving along the path, wherein
the wireless communication system performs wireless communication between the base station and the mobile station by changing over a frequency channel to be used for each time slot among a plurality of candidate frequency channels, and
each of the base station and the mobile station selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than predetermined first number of cells, from a cell used for the wireless communication, and allows the frequency channel selected to overlap with the frequency channel to be used in a same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than number of the candidate frequency channels, from a cell used for the wireless communication.
12. A wireless communication method for performing wireless communication between a base station located along a predetermined path and a mobile station positioned within a cell formed by the base station and moving along the path by changing over a frequency channel to be used for each time slot among a plurality of candidate frequency channels, wherein
each of the base station and the mobile station selects a frequency channel that is different from a frequency channel to be used in a same time slot by an adjacent cell located at a cell interval, equal to or smaller than predetermined first number of cells, from a cell used for the wireless communication, and allows the

frequency channel selected to overlap with the frequency channel to be used in a same time slot by a remote cell located at a cell interval, greater than the first number of cells and equal to or smaller than number of the candidate frequency channels, from a cell used for the wireless communication.