To solve a problem that, at an intersection where a radio control device is not insulated, a radio terminal device of each vehicle cannot grasp the transmission time of data received from a radio terminal device of another vehicle.SOLUTION: A semiconductor device includes: a transmission control unit which executes a transmission processing; an area determination unit which determines whether or not the self-vehicle is located in the intersection area; and an operation mode determination unit which determines either a control mode or a terminal mode as the operation mode of the radio terminal device, based on the identification information, by which the transmission source of a received communication frame is identified, and the determination result of the area determination unit. When the operation mode is determined to be the control mode, the transmission control unit outputs, as transmission data, a communication frame including generated control information. When the operation mode is determined to be the terminal mode, the transmission control unit synchronizes with a communication frame including received control information to output transmission data.SELECTED DRAWING: Figure 2
【課題】無線制御装置が設置されていない交差点では、各車両の無線端末装置は、他車両の無線端末装置から受け取ったデータの送信時期を把握することができない。【解決手段】半導体装置は、送信処理を実行する送信制御部と、自車両が交差点エリアに位置しているか否かを判定するエリア判定部と、受信した通信フレームの発信元を識別するための識別情報およびエリア判定部の判定結果に基づいて、制御モードもしくは端末モードのいずれかを無線端末装置の動作モードとして決定する動作モード決定部を備える。動作モードが制御モードに決定された場合、送信制御部は、生成した制御情報を含む通信フレームを送信データとして出力する。動作モードが端末モードに決定された場合、送信制御部は、受信した制御情報を含む通信フレームに同期して送信データを出力する。【選択図】図2
SEMICONDUCTOR DEVICE, RADIO TERMINAL DEVICE AND RADIO TERMINAL DEVICE COMMUNICATION METHOD
半導体装置、無線端末装置および無線端末装置の通信方法
2020-09-17
Patent
Electronic Resource
Japanese
SEMICONDUCTOR DEVICE, RADIO TERMINAL DEVICE, AND COMMUNICATION METHOD OF RADIO TERMINAL DEVICE
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