A relay node RN, a donor eNodeB DeNB and a communication method are disclosed, where the RN includes: a sending module, configured to send an indication message to a donor eNodeB DeNB, where 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, where 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, where 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. In this application, a Un bearer is reconfigured to support a data stream aggregation technology, thereby improving a throughput rate of a user in a case of ensuring business continuity.
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