Patent ID: 7693127

Claim:
A time-division synchronous wireless modem device provided at each of a plurality of wireless stations in a wireless system which transmits and receives communication packets containing a header between the individual wireless stations via one wireless channel by using, on a one-by-one basis, any of communication slots obtained through time division of a predetermined transmission cycle period by a predetermined unit transmission time, the time- division synchronous wireless modem device being characterized by comprising: a modem unit which transmits and receives the communication packets; a communication state determination unit which obtains a transmission cycle period and the total number of wireless stations in use each contained in a header of the received communication packet; and a transmission timing controller which selectively determines an arbitrary one of the communication slots in a next transmission cycle period when the communication packet is not received during the entire span of the one transmission cycle period, or selectively determines the one of the communication slots to be used by estimating a vacant one of the communication slots in the next transmission cycle period from the transmission cycle period and the total number of wireless stations in use each obtained by the communication state determination unit when the communication packet is received.