Reference signal arrangement method and wireless communication base station apparatus

摘要

A wireless communication base station apparatus which is able to prevent deterioration in the throughput of LTE terminals even when LTE terminals and LTE+ terminals coexist. In this apparatus, based on the mapping pattern of the reference signals used only in LTE+ terminals, a setting unit (105) sets, in each subframe, the resource block groups where the reference signals used only by the LTE+ terminals are mapped. For symbols mapped to the antennas (110-1 to 110-4), an mapping unit (106) maps, to all the resource blocks within one frame, cell specific reference signals used for both LTE terminals and LTE+ terminals. For the symbols mapped to the antennas (110-5 to 110-8), the mapping unit (106) maps, to the plurality of resource blocks, of which part of the resource block groups is comprised, in the same subframe within one frame, the cell specific reference signals used only for LTE+ terminals, based on the setting results inputted from the setting unit (105).

主权项

1. A radio communication apparatus comprising:
a mapping section configured to map a first reference signal for computing a channel quality indicator (CQI) in a subframe; and a transmitting section configured to transmit the mapped first reference signal to a first terminal for a first communication system, wherein the first reference signal is not transmitted in a subframe where a transmission of the first reference signal collides with a transmission of physical broadcast channel (PBCH) or system information block 1 (SIB1), and said mapping section further maps a third reference signal for computing a CQI in all subframes, and said transmitting section further transmits the mapped third reference signal to the first terminal for the first communication system and to a second terminal for a second communication system.