Embodiments of the present disclosure provide a resource allocation method and apparatus for a small cell cluster and a communications system. The resource allocation method includes: exchanging by the base station of the upper level with another base station of the upper level, to obtain information on resources and/or interference of the other base station of the upper level; receiving information by the base station of the upper level at least from the cluster head of the SCC, to obtain information on resources and/or interference of the base station of the upper level; and allocating resources for the small cell cluster by the base station of the upper level based on the obtained information on resources and/or interference of the other base station of the upper level and the information on resources and/or interference of the base station of the upper level. According to the embodiments, interference coordination may be performed efficiently on a small cell cluster at an edge of the base station of the higher lever, so as to lower the interference to the small cell cluster, and the expandability of the network may be improved.