Radio remote unit and link fault reporting method thereof as well as wireless communication system

The invention discloses a radio remote unit (RRU) and a link fault reporting method thereof as well as a wireless communication system. The method comprises the following steps: 1, judging whether a downlink and/or uplink optical fiber link fault is caused between a current RRU and a previous RRU, if so, going to the step 2, and otherwise, going to the step 3; 2, calculating a serial number of the current RRU through the previous RRU, resetting a fault warning control word in combination with a congruent relationship between a bit position in the fault warning control word and a predetermined serial number, and going to the step 3; 3, sending the fault warning control word to a more previous RRU by the previous RRU, and returning to the step 1; reporting the fault warning control word to a BBU (Base Band Unit) until a first RRU detects whether the downlink and/or uplink optical fiber link fault is caused between the first RRU and the BBU. Through the technical scheme, the problems that the uplink optical fibe