ORAN SYSTEM AND METHOD OF TIME SYNCHRONIZATION FOR RU AND DU IN ORAN SYSTEM
개요
발명자
Tzu-Chung KE; Yan-Ciao JAO
IPC 분류
CPC 분류
An ORAN system includes an RU and a DU. The RU includes a crystal oscillator set with a standard oscillation frequency, and a clock generator using the frequency as a reference to define one second, generating a drive signal and generating clock pulse signals according to the frequency. The RU includes a digital counter, which, upon receiving each clock pulse signal, adds one to a count value, and which receives a PPS signal from a GNSS module every second. Upon receiving the PPS signal, the digital counter reads the count value, determines whether the read count value is equal to a value of the frequency, and resets the count value to zero. If the read count value is not equal to the value of the frequency, the digital counter sends an oscillation frequency adjustment signal to the crystal oscillator for adjusting the crystal oscillator's oscillation frequency.
원문 (중국어)
An ORAN system includes an RU and a DU. The RU includes a crystal oscillator set with a standard oscillation frequency, and a clock generator using the frequency as a reference to define one second, generating a drive signal and generating clock pulse signals according to the frequency. The RU includes a digital counter, which, upon receiving each clock pulse signal, adds one to a count value, and which receives a PPS signal from a GNSS module every second. Upon receiving the PPS signal, the digital counter reads the count value, determines whether the read count value is equal to a value of the frequency, and resets the count value to zero. If the read count value is not equal to the value of the frequency, the digital counter sends an oscillation frequency adjustment signal to the crystal oscillator for adjusting the crystal oscillator's oscillation frequency.