To use the band of a radio frame without waste when the radio frame of a fixed band performs bidirectional data communication between a base station and a plurality of subscriber stations.
The base station determine the number of time slots of slot request area TS14 variably in response to the number of the subscriber stations which grants a transmission right determined by the number of decision steps of the subscriber stations, and assigns the time slots which are not used as a slot request area TS14 to the data areas TS15, TS12 of the radio frame in the assigning step. If it does in this way, the transmission right of the time slots is not assigned to meaningless subscriber stations even by assigning, such as the subscriber stations in which a power source becomes in an off state, and the band of the radio frame can be utilized efficiently.
COPYRIGHT: (C)2005,JPO&NCIPI
Shinya Yoneda
Fumio Murakami
Hiromasa Kuwahara
Yoshiyuki Yasui
Mizumoto Yukihide
Nippon Telegraph and Telephone Corporation
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Toshiyuki Miyadera