In the radio base station apparatus, the demodulation information generating section 214 generates the information of the CoMP cell on the CRS multiplexing pattern as the information for demodulation. Next, the downlink control signal generating section 215 includes bits corresponding to the information of the CoMP cell in the DCI to generate a downlink control signal. The radio base station apparatus transmits the downlink control signal to the mobile terminal apparatus. Further, the radio base station apparatus transmits the cell ID of the CoMP cell to the mobile terminal apparatus as the information for demodulation by higher-layer signaling.

In the mobile terminal apparatus, the acquisition section 111 refers to the table as shown in FIG. 13, and obtains the information (information on the cell for the CRS multiplexing pattern) of the CoMP cell on the CRS multiplexing pattern. Meanwhile, the acquisition section 111 has acquired the CoMP cell ID number transmitted by higher-layer signaling, calculates a shift amount of the CRS from the information of the CoMP cell and the CoMP cell ID number, and based on the shift amount, obtains the CRS multiplexing pattern. Next, the user data demodulation section 113 demodulates the user data using the CRS multiplexing pattern.

(Fourth Method-1)

The radio base station apparatus transmits the PDSCH muting pattern to the mobile terminal apparatus as the information for demodulation by higher-layer signaling (semi-static). Further, in the case of notifying of the PDSCH muting pattern statically, the radio base station apparatus transmits the PDSCH muting pattern as shown in FIG. 14 to the mobile terminal apparatus at the time of starting communications or the like.