| 摘要 |
An RF unit and a modem unit receive packet signals. A processing unit processes the received packet signals. A measurement unit measures the received power of the packet signals received. A monitoring unit monitors the variation in the received power of the packet signals measured by the measurement unit. When the received power increases in such a manner that the variation monitored by the monitoring unit is larger than a threshold value, a notification unit starts to convey information reflecting the content of the packet signals processed by the processing unit.
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