| 摘要 |
PROBLEM TO BE SOLVED: To prolong the service life of a battery of a slave set by allowing a private master set to transmit a control signal to a slave set resident in an area where a public mode service area and a private mode service area are overlapped through the use of a time slot adjacent to that of a control signal for a public master set to educe the power consumption of the slave set in its standby state. SOLUTION: The private master set 4 sets a private use control signal transmission period on the basis of a control signal transmission period for the public master set 3, writes the information to control data and conducts encoding. Then the private master set 4 sets a time slot to accommodate a private control signal to a position of a time slot adjacent behind that of a public control signal and transmits the control signal to a slave set 5. The slave set 5 receives both the public and private control signals, its transmission control section stores in advance periods of control signals of each master set 4, activates a power supply of a radio section in a timing earlier by a prescribed time from a leading edge of the public control signal to be received, and succeedingly receives the public control signal set behind by oe time slot. Thus, number of times of on/off of the power supply of the slave set can be reduced and the power on-time can be decreased. |
