A joint channel correction method performed by a system, the system comprising: ∘ a plurality of remote radio units, RRUs, and ∘ a joint channel correction apparatus, ∘ wherein the plurality of RRUs are divided into multiple RRU clusters, each RRU cluster comprises at least two RRUs, wherein each RRU within a same RRU cluster is adjacent to the other RRUs within the same cluster and has a signal to noise ratio of signals exchanged between the RRU and a reference RRU larger than a threshold, and for a certain RRU cluster, among the multiple RRU clusters, being formed by a first RRU and a second RRU, the following method steps are performed: • sending, by the joint channel correction apparatus, a first joint channel correction instruction to the first RRU, wherein the first joint channel correction instruction is used to trigger the first RRU to send a first correction reference signal through X1 transmit channels in X1 traffic channels of the first RRU; • sending, by the joint channel correction apparatus, a second joint channel correction instruction to the second RRU, wherein the second joint channel correction instruction is used to trigger the second RRU to send a second correction reference signal through X2 transmit channels in X2 traffic channels of the second RRU; • receiving, by the joint channel correction apparatus, a result sent by the second RRU about reception of the first correction reference signal through X2 receive channels in the X2 traffic channels, and receiving a result sent by the first RRU about reception of the second correction reference signal through X1 receive channels in the X1 traffic channels; and • obtaining, by the joint channel correction apparatus, correction compensation coefficients of the X1 traffic channels and/or the X2 traffic channels through calculation according to the first correction reference signal, the result about reception of the first correction reference signal through the X2 receive channels, the second correction reference signal, and the result about reception of the second correction reference signal through the X1 receive channels, wherein X1 and X2 are integers greater than 1. ∘ a plurality of remote radio units, RRUs, and ∘ a joint channel correction apparatus, ∘ wherein the plurality of RRUs are divided into multiple RRU clusters, each RRU cluster comprises at least two RRUs, wherein each RRU within a same RRU cluster is adjacent to the other RRUs within the same cluster and has a signal to noise ratio of signals exchanged between the RRU and a reference RRU larger than a threshold, • sending, by the joint channel correction apparatus, a first joint channel correction instruction to the first RRU, wherein the first joint channel correction instruction is used to trigger the first RRU to send a first correction reference signal through X1 transmit channels in X1 traffic channels of the first RRU; • sending, by the joint channel correction apparatus, a second joint channel correction instruction to the second RRU, wherein the second joint channel correction instruction is used to trigger the second RRU to send a second correction reference signal through X2 transmit channels in X2 traffic channels of the second RRU; • receiving, by the joint channel correction apparatus, a result sent by the second RRU about reception of the first correction reference signal through X2 receive channels in the X2 traffic channels, and receiving a result sent by the first RRU about reception of the second correction reference signal through X1 receive channels in the X1 traffic channels; and • obtaining, by the joint channel correction apparatus, correction compensation coefficients of the X1 traffic channels and/or the X2 traffic channels through calculation according to the first correction reference signal, the result about reception of the first correction reference signal through the X2 receive channels, the second correction reference signal, and the result about reception of the second correction reference signal through the X1 receive channels, wherein X1 and X2 are integers greater than 1.