REFERENCE SIGNAL RECEPTION AND CQI COMPUTATION METHOD AND WIRELESS COMMUNICATION 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 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, an mapping unit 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, the mapping unit 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.

主权项

1. A communication apparatus comprising:
a receiving section, which, in operation, receives a first reference signal that is mapped in a subframe and transmitted to the communication apparatus for a first communication system; and a measuring section, which, in operation, computes a channel quality indicator (CQI) based on the received first reference signal, 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), said receiving section, in operation, further receives a second reference signal that is mapped in all subframes and transmitted to the communication apparatus for the first communication system and another communication apparatus for a second communication system, and said measuring section, in operation, further computes a CQI based on the received second reference signal.