TIME SYNCHRONIZING DEVICE, DATA SAMPLING DEVICE, TIME SYNCHRONIZING METHOD, AND DATA SAMPLING METHOD
PROBLEM TO BE SOLVED: To provide a time synchronizing device capable of performing high-accuracy time synchronization while suppressing influences caused by performing carrier sensing during time synchronized communication, a data sampling device, a time synchronizing method, and a data sampling met...
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Format: | Patent |
Sprache: | eng ; jpn |
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a time synchronizing device capable of performing high-accuracy time synchronization while suppressing influences caused by performing carrier sensing during time synchronized communication, a data sampling device, a time synchronizing method, and a data sampling method.SOLUTION: The time synchronizing device includes a master station and slave stations between which transmission/reception can be mutually performed by radio communication. The master station includes: calculation means for calculating a total sum of transmission times of the master station per past fixed time; and comparison means for comparing the total sum of the transmission times with a carrier sense unnecessary reference time. Each of the master station and the slave stations includes time update means (A) which executes a time update method (a) for transmitting a present time from the master station to the slave station without performing carrier sensing. When the total sum of the transmission times is equal to or less than the reference time, the time update means (A) executes the time update method (a). When the total sum of the transmission times exceeds the carrier sense unnecessary reference time, the calculation means calculates a total sum of transmission times of the master station per past fixed time again.
【課題】 時刻同期の通信時に、キャリアセンス行うことによる影響を抑え、高精度の時刻同期を行う時刻同期装置、データ採取装置、時刻同期方法およびデータ採取方法を提供する。【解決手段】 本発明の時刻同期装置は、無線通信によって相互に送受信可能な、親局と、子局とを含み、前記親局は、前記親局の過去一定時間当たりの送信時間の総和を算出する算出手段と、前記送信時間の総和とキャリアセンス不要基準時間とを比較する比較手段とを含み、前記親局と前記子局は、前記親局から、前記子局に対し、キャリアセンスを行わず現在時刻を送信する時刻更新方法(a)を実行する時刻更新手段(A)とを含み、前記送信時間の総和が、前記基準時間以下であるとき、前記時刻更新手段(A)が、前記時刻更新方法(a)を実行し、前記送信時間の総和が、キャリアセンス不要基準時間を超えているとき、再び前記算出手段が、前記親局の過去一定時間当たりの送信時間の総和を算出することを特徴とする。【選択図】 図1 |
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