A relay node RN, comprising: a sending module, configured to send an indication message to a donor eNodeB DeNB, wherein the indication message is used to indicate whether the RN supports data stream aggregation; a receiving module, configured to: when the DeNB determines, according to the indication message, that the RN supports data stream aggregation, receive a request sent by the DeNB, wherein the request is used to request to communicate with user equipment UE by means of data stream aggregation between the RN and the DeNB; and a configuration module, configured to reconfigure a bearer between the RN and the DeNB according to the request, wherein the sending module is further configured to instruct the DeNB to communicate with the UE by means of the data stream aggregation between the DeNB and the RN, wherein in said data stream aggregation, the UE receives data from or transmits data to the DeNB and the RN at the same time, characterized in that in said data stream aggregation, the DeNB is configured to provide mainly mobility management to the UE, while the RN is configured to provide mainly user data to the UE, the request that is sent by the DeNB and that is received by the receiving module further comprises: a quality of service QoS parameter, wherein QoS refers to a bandwidth of the air interface Un between the RN and the DeNB and the data stream aggregation is a multiple stream aggregation; the QoS parameter is used to reconfigure the bearer between the RN and the DeNB; and in that the configuration module is specifically configured to: reconfigure the bearer between the RN and the DeNB according to the QoS parameter. a sending module, configured to send an indication message to a donor eNodeB DeNB, wherein the indication message is used to indicate whether the RN supports data stream aggregation; a receiving module, configured to: when the DeNB determines, according to the indication message, that the RN supports data stream aggregation, receive a request sent by the DeNB, wherein the request is used to request to communicate with user equipment UE by means of data stream aggregation between the RN and the DeNB; and a configuration module, configured to reconfigure a bearer between the RN and the DeNB according to the request, wherein the sending module is further configured to instruct the DeNB to communicate with the UE by means of the data stream aggregation between the DeNB and the RN, wherein in said data stream aggregation, the UE receives data from or transmits data to the DeNB and the RN at the same time, characterized in that in said data stream aggregation, the DeNB is configured to provide mainly mobility management to the UE, while the RN is configured to provide mainly user data to the UE, the request that is sent by the DeNB and that is received by the receiving module further comprises: a quality of service QoS parameter, wherein QoS refers to a bandwidth of the air interface Un between the RN and the DeNB and the data stream aggregation is a multiple stream aggregation; the QoS parameter is used to reconfigure the bearer between the RN and the DeNB; and in that the configuration module is specifically configured to: reconfigure the bearer between the RN and the DeNB according to the QoS parameter. a quality of service QoS parameter, wherein QoS refers to a bandwidth of the air interface Un between the RN and the DeNB and the data stream aggregation is a multiple stream aggregation; the QoS parameter is used to reconfigure the bearer between the RN and the DeNB; and in that the configuration module is specifically configured to: reconfigure the bearer between the RN and the DeNB according to the QoS parameter.