| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system which is free from a problem of a hidden terminal in spite of using a directional antenna and where fear of tapping in radio communication using the omnidirectional antenna is small. SOLUTION: A radio terminal 10 transmits RTS to radio terminals 11 to 15 without directivity, and transmits data to the radio terminal 13 which is a transmission destination by setting directivity. Even if a tapping terminal 13A exists, it can receive the RTS but cannot receive the data. COPYRIGHT: (C)2003,JPO
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