The invention provides a communication method, an RUU, an RUHUB and a communication
system. The method can be applied to a communication
system, and the communication
system comprises a BBU and an RHUB connected with the BBU. The method comprises the following steps that the RHUB receives IP / UDP data from the BBU; and the RHUB processes the IP / UDP data to obtain
digital intermediate frequency data. Thus, the downlink data transmitted between the RHUB and the BBU is IP / UDP data; the digital intermediate-
frequency data is not the digital intermediate-
frequency data in the prior art; the data volume of the IP / UDP data is far less than the data volume of the
digital intermediate frequency data; thus, the
bandwidth requirement of the forward transmission interface between the RHUB and the BBU in the downlink direction can be reduced, so the RHUB and the BBU can meet the
bandwidth requirement of communication in the uplink direction by using the existing
optical fiber under the condition that the spectral bandwidth of a
cell is sharply increased.