無線通信システム

Radio communication system

Abstract

【課題】同期信号に対する同期外れを防ぎつつ電池寿命の延長を図る。 【解決手段】従来では発振器6に使用される発振子(音叉型水晶振動子)のスペックに基づいて同期信号の周期を一律に8時間に設定していたため、必要以上に短い周期で同期信号が送信されることで親器TR1及び子器TRiの電池寿命が短出されてしまっていた。これに対して本実施形態では、発振器6に使用される発振子の実際の周波数偏差の値に基づいて、親器TR1の制御部1が同期信号の周期を調整しているので、同期信号に対する同期外れを防ぎつつ、同期信号の送信と時間ずれΔTの検出に伴う電力消費を抑えて電池寿命の延長を図ることができる。 【選択図】 図1
PROBLEM TO BE SOLVED: To provide a radio communication system in which the service life of a battery is prolonged while preventing synchronization loss with a synchronizing signal.SOLUTION: A conventional system sets the period of synchronizing signals across the board at eight hours on the basis of the specs of an oscillator (tuning fork crystal resonator) to be used for an oscillating device 6, and thus, the synchronizing signals are transmitted at a period shorter than necessity to shorten the service life of batteries in a master device TR1 and a slave device TRi. In order to solve the problem, in this system, a control part 1 of a master device TR1 controls the period of synchronizing signals on the basis of a value of an actual frequency deviation of an oscillator used for the oscillating device 6, and thus, power consumption due to transmission of the synchronizing signals and detection of time deviation ΔT is suppressed while preventing synchronization loss of the synchronizing signals to prolong the service life of batteries.

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