| 摘要 |
The present invention relates to a data communication system in which a first request signal containing position information is transmitted from a first mobile unit (6) to a base station (2), and in which the base station (2) searches for a, second mobile unit (5) in accordance with the position information contained in the first request signal, then transmits a second request signal to the second mobile-unit (5), and returns data returned from the second mobile unit (5) to the, first mobile unit (6).
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