| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radio device capable of easily determining whether radio communication is possible or not if another radio device interferes with the radio device. <P>SOLUTION: Each of radio devices 2, 4 periodically transmits a pilot signal on a pilot channel. A radio device 5 transmits a pilot signal to a radio device 3 on a pilot channel when starting radio communication with the radio device 3. The radio device 3 measures interference power I<SB POS="POST">j</SB>on a data channel and a signal-to-noise and interference ratio SINR<SP POS="POST">P</SP>obtained when the pilot signal from the radio device 5 is received on the pilot channel. The radio device 3 transmits the interference power I<SB POS="POST">j</SB>and the signal-to-noise and interference ratio SINR<SP POS="POST">P</SP>to the radio device 5. The radio device 5 holds a target signal-to-noise and interference ratio SINR<SP POS="POST">T</SP>on a data channel. The radio device 5 calculates transmission powerσ<SB POS="POST">j</SB>=SINR<SP POS="POST">T</SP>×I<SB POS="POST">j</SB>and an evaluation value SINR<SP POS="POST">T</SP>/SINR<SP POS="POST">P</SP>. If it is determined that the evaluation value SINR<SP POS="POST">T</SP>/SINR<SP POS="POST">P</SP>is equal to or less than a constant value c, the radio device 5 transmits a packet including ordinary data to the radio device 3 at the transmission powerσ<SB POS="POST">j</SB>. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
