ROAD SIDE COMMUNICATION DEVICE, TIME SYNCHRONIZATION METHOD, AND COMPUTER PROGRAM

To secure precision of a local time by time synchronization while suppressing delay of information processing other than the time synchronization.SOLUTION: A road side communication device to be used in a traffic control system includes: a high-order side transmission/reception section for executing signal processing based on a high-order side transmission system; a low-order side transmission/reception section for executing signal processing based on a low-order side transmission system; and a communication control section for repeating a downlink frame from the high-order side transmission/reception section to the low-order side transmission/reception section and repeating an uplink frame from the low-order side transmission/reception section to the high-order side transmission/reception section. The communication control section includes a CPU for performing time synchronization to correct a time of an internal clock with a reference pulse signal as an interruption signal with the highest priority on the basis of time information and the reference pulse signal generated by a satellite. The CPU executes priority cancellation processing to cancel setting to set the reference pulse signal to have the highest priority, only for a predetermined period.SELECTED DRAWING: Figure 4 【課題】 時刻同期以外の情報処理の遅延を抑制しつつ、時刻同期によるローカル時刻の精度を確保する。【解決手段】 本開示の一態様に係る装置は、交通管制システムに用いられる路側通信装置であって、上位側伝送方式に基づく信号処理を実行する上位側送受信部と、下位側伝送方式に基づく信号処理を実行する下位側送受信部と、前記上位側送受信部から前記下位側送受信部に下りフレームを中継し、前記下位側送受信部から前記上位側送受信部に上りフレームを中継する通信制御部と、を備える。前記通信制御部は、衛星が生成する時刻情報と基準パルス信号に基づいて、前記基準パルス信号を最優先の割込信号として内部時計の時刻を修正する時刻同期を実行可能なＣＰＵを有し、前記ＣＰＵは、前記基準パルス信号を最優先とする設定を所定期間だけ解除する優先解除処理を実行する。【選択図】 図４