To avoid a signal collision by differentiating the transmission timing of a link establishment request to be resent by broadcasting a collision detection signal from a radio terminal detecting a collision of the link establishment request.
A radio terminal 100 includes an intermittent operation control section 101, a transmitting operation control section 102, a directly communicable terminal investigation section 103, and a collision detection control section 106. In a state of transiting to a link establishment state for data transmission reception, the collision detection control section 106 detects a link establishment request signal colliding, when the directly communicatable terminal investigation section 103 determines that direct communication is possible and link establishment based on link establishment request signals from a plurality of other devices sending the link establishment request signals fails in end. When the collision is detected, a collision detection signal is broadcast to the other devices sending the link establishment request signals, and the reception state is extended.
COPYRIGHT: (C)2011,JPO&INPIT
Kawada Takuya
Kentaro Sakamoto
Masahiro Yasui
Hiroshi Ishida
Tomonori Sato
Kubo Kei
Minoru Tabe
Masaaki Sakata
Takaaki Hatakeuchi
Shinichi Soma
Tokyo Gas Co., Ltd.
OSAKA GAS CO.,LTD.
Toho Gas Co., Ltd.
Toko Toshiba Meter Systems Co., Ltd.
Panasonic Corporation
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