Patent ID: 8300617

Claim:
A time division multiplexing system comprising a base station and a subscriber station communicable with said base station, wherein said subscriber station comprises: a transmitter that transmits a ranging request message; a receiver that receives response information in response to the ranging request message transmitted by said transmitter; and a controller that transmits said ranging request message from said transmitter at a transmission timing which has been previously set, and subsequently, if said receiver has not received the response information in response to said ranging request message within a predetermined period, retransmits said ranging request message from said transmitter earlier than a next transmission timing which has been previously set, and said base station comprises: a base station transmitter; a base station receiver that receives said ranging request message; and a base station controller that, if said base station receiver has received said ranging request message, transmits said response information from said base station transmitter, wherein said base station controller sets a data area with respect to said subscriber station within a data frame to be transmitted to said subscriber station, and said base station controller adjusts a position of said data area if a reception time of receiving data from said base station and a transmission time of transmitting the data to said base station have overlapped in said subscriber station.