Base station apparatus, mobile terminal apparatus and communication control method

摘要

The present invention makes it possible to transmit and receive CSI-RSs adequately even when the number of CSI-RSs increase following the increase of antennas. The present invention provides a base station apparatus (20) that transmits CSI-RSs to a mobile terminal apparatus (10A) which is capable of receiving CSI-RSs for channel state measurement from a plurality of antennas, and to a mobile terminal apparatus (10B) which is capable of receiving CSI-RSs from a smaller number of antennas than the mobile terminal apparatus, and this base station apparatus has a CSI-RS allocation section (211) which allocates CSI-RSs for the number of antennas which the mobile terminal apparatus (10A) supports, to radio resources, and a transmitting/receiving section which reports, to the mobile terminal apparatus (10A), the resources where the CSI-RSs are allocated, and which, upon reporting the resources where CSI-RSs are allocated, to the mobile terminal apparatus (10B), reports part of the resources as resources to be muted.

主权项

1. A base station apparatus that is able to support up to a maximum number of transmission ports for CSI-RS (Channel State Information Reference Signal), which is a reference signal for channel measurement, and communicates with a plurality of mobile terminal apparatuses which are able to support different maximum numbers of transmission ports for CSI-RS, the base station apparatus comprising:
an allocation section that allocates CSI-RSs to resource elements specified by a CSI-RS pattern associated with any number of transmission ports, the CSI-RS pattern indicating allocation of the CSI-RSs in a resource block and being defined in association with each of numbers of transmission ports from a minimum number up to the maximum number of transmission ports; a position information generating section that generates CSI-RS position information to specify resources to which the CSI-RSs are allocated; a muting information generating section that generates muting information indicating that, of the CSI-RSs allocated to the resource elements by the allocation section, CSI-RSs that are not supported by a mobile terminal apparatus as a communication target are subjected to muting of transmission power for resource elements; and a transmission section that transmits the CSI-RSs allocated to the resource elements by the allocation section, the muting information and the CSI-RS position information.