Clock synchronization method, radio frequency remote unit, baseband processing unit and base station

The invention discloses a clock synchronization method, a radio frequency remote unit, a baseband processing unit and a base station. The clock synchronization method includes the following steps that: the radio frequency remote unit receives Beidou information transmitted by a Beidou satellite, and processes the Beidou information, and then extract Beidou clock; the radio frequency remote unit receives empty interface frame frequency transmitted by the baseband processing unit; the radio frequency remote unit, adopting the Beidou clock as reference clock, performs phase detection counting and clock locking on the empty interface frame frequency, so as to obtain a first phase detection value; and the radio frequency remote unit returns the first phase detection value and the frame number of the empty interface frame frequency to the baseband processing unit, so that the first phase detection value and the frame number of the empty interface frame frequency can be used for clock synchronization. According to the method, with the Beidou clock adopted as the reference clock, and clock synchronization is carried out between the radio frequency remote unit and the baseband processing unit; and since the Beidou system is developed by our country, and too high cost will not be generated in the use of the Beidou clock, and the cost of the clock synchronization between the radio frequency remote unit and the baseband processing unit can be decreased.