BASE STATION, COMMUNICATION SYSTEM, AND REFERENCE SIGNAL TRANSMISSION METHOD

摘要

Provided is a base station wherein the amount of radio resources consumed by beam searches can be reduced. In the base station (10) that performs beam forming for a user terminal, a propagation loss acquisition unit (102) acquires a distribution of propagation losses in a sector. A candidate beam set determination unit (103) determines a candidate beam set on the basis of the distribution of propagation losses. More specifically, the candidate beam set determination unit (103) determines a candidate beam set constituted by a plurality of candidate beams including thin and thick candidate beams each having a beam width based on the distribution of propagation losses. A planar antenna (101) transmits reference signals to the user terminal by use of the respective ones of the plurality of candidate beams constituting the candidate beam set.