| 摘要 |
PROBLEM TO BE SOLVED: To avoid the collision of superframes of master sets with each another and to enable a slave set to appropriately receive control information when there are plural master sets in the same area by transmitting the superframe for the master set to inform the slave set of the control information for a specified period of time, stopping transmission for a short period of time and repeating the operation of transmission for the specified period of time. SOLUTION: A communication control part for master sets CS1 to CSn transmits a superframe and at the same time starts up a timer for measuring a transmission time and stops transmitting when the time is out and at the same time starts a timer for measuring a stop time and again transmits the superframe when the time is out. Thus, even when a superframe overlaps with a superframe to be transmitted by other master sets CS1 to CSn before stopping transmission of the superframe, the overlap is eliminated when a retransmission is performed after the transmission is once stopped, thereby avoiding the collision of the superframes. |
