A system comprising a communication apparatus and a base station, wherein: the communication apparatus comprising, a receiving section adapted to: receive a first reference signal, which is mapped in resource blocks of all subframes of a frame and which is cell-specific and used for both an Long Term Evolution, LTE, system and an LTE-Advanced system, each of the resource blocks being comprised of a number of subcarriers in a frequency domain and a number of Orthogonal Frequency Division Multiplexing, OFDM, symbols in a time domain; receive information related to a second reference signal, which is cell-specific and used only for the LTE-Advanced system; and receive the second reference signal based on the information, the information indicating a mapping of the second reference signal that is mapped in resource blocks of a subset of all subframes of the frame, the subframes in such subset having a given period between them, and a measuring section adapted to compute a Channel Quality Indicator, CQI, based on at least one of the received first reference signal and the received second reference signal; and the base station comprising: a mapping section (104, 106) adapted to map the first reference signal, and map the second reference signal; and a transmitting section adapted to transmit the mapped first reference signal and the mapped second reference signal to the communication apparatus, characterized in that the second reference signal is mapped in resource blocks other than resource blocks, in which data signals directed to a terminal for the LTE system are included. the communication apparatus comprising, a receiving section adapted to: receive a first reference signal, which is mapped in resource blocks of all subframes of a frame and which is cell-specific and used for both an Long Term Evolution, LTE, system and an LTE-Advanced system, each of the resource blocks being comprised of a number of subcarriers in a frequency domain and a number of Orthogonal Frequency Division Multiplexing, OFDM, symbols in a time domain; receive information related to a second reference signal, which is cell-specific and used only for the LTE-Advanced system; and receive the second reference signal based on the information, the information indicating a mapping of the second reference signal that is mapped in resource blocks of a subset of all subframes of the frame, the subframes in such subset having a given period between them, and a measuring section adapted to compute a Channel Quality Indicator, CQI, based on at least one of the received first reference signal and the received second reference signal; and receive a first reference signal, which is mapped in resource blocks of all subframes of a frame and which is cell-specific and used for both an Long Term Evolution, LTE, system and an LTE-Advanced system, each of the resource blocks being comprised of a number of subcarriers in a frequency domain and a number of Orthogonal Frequency Division Multiplexing, OFDM, symbols in a time domain; receive information related to a second reference signal, which is cell-specific and used only for the LTE-Advanced system; and receive the second reference signal based on the information, the information indicating a mapping of the second reference signal that is mapped in resource blocks of a subset of all subframes of the frame, the subframes in such subset having a given period between them, and a measuring section adapted to compute a Channel Quality Indicator, CQI, based on at least one of the received first reference signal and the received second reference signal; and the base station comprising: a mapping section (104, 106) adapted to map the first reference signal, and map the second reference signal; and a transmitting section adapted to transmit the mapped first reference signal and the mapped second reference signal to the communication apparatus, a mapping section (104, 106) adapted to map the first reference signal, and map the second reference signal; and a transmitting section adapted to transmit the mapped first reference signal and the mapped second reference signal to the communication apparatus, characterized in that the second reference signal is mapped in resource blocks other than resource blocks, in which data signals directed to a terminal for the LTE system are included.