A wireless communication system 1 performs inter-cell coordination control that coordinates a pico base station 100 and a macro base station 200 with each other and transmits a signal to a mobile station 10 of a picocell. The pico base station 100 includes a controller 100a and a communication unit 100b. The controller 100a interleaves resources of an E-PDCCH of the picocell corresponding to a predetermined resource unit based on a coordinated area ID that is an identifier common to the pico base station 100 and the macro base station 200. The communication unit 100b transmits a control signal to the mobile station 10 of the picocell using a first resource of the E-PDCCH of the picocell that corresponds to at least a part of the predetermined resource unit and is to be decoded by the mobile station 10 of the picocell.