| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique of efficiently performing broadcast transmission.SOLUTION: Each of an RF unit 52 and a modulation and demodulation unit 54 receives signals notified from plural portable terminal devices. A grouping execution unit 68 selects any portable terminal device out of the plural portable terminal devices on the basis of the received signal. The modulation and demodulation unit 54 and the RF unit 52 notify a selection result. The selected portable terminal device continues to notify signals, and the portable terminal devices other than the selected portable terminal device stop notification of signals.SELECTED DRAWING: Figure 5 |
