A base station comprising: a configuration section that is adapted to configure in a physical downlink control channel, PDCCH, region a search space defined by a plurality of candidates targeted for decoding at a terminal, each of the candidates being formed by one or more control channel elements, CCEs; and a transmitting section that is adapted to allocate a PDCCH in any of the plurality of candidates targeted for decoding included in the configured search space and transmit the PDCCH to the terminal, wherein each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with a number of blind decoding operations for the PDCCH, characterized in that the configuration section is adapted to vary the association between each number of the one or more CCEs forming each of the candidates targeted for decoding and the number of the blind decoding operations for the PDCCH depending on if the PDCCH is to be transmitted along with relay physical downlink control channel, R-PDCCH, wherein each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with the number of the blind decoding operations for the PDCCH based on a first configuration rule if the PDCCH is to be transmitted without the R-PDCCH, each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with the number of the blind decoding operations for the PDCCH based on a second configuration rule if the PDCCH is to be transmitted along with the R-PDCCH, and the first configuration rule is different from the second configuration rule such that the number of blind decoding operations with respect to larger numbers of the one or more CCEs is unchanged for the PDCCH in the second configuration rule and the number of blind decoding operations with respect to smaller numbers of the one or more CCEs is reduced for the PDCCH in the second configuration rule. a configuration section that is adapted to configure in a physical downlink control channel, PDCCH, region a search space defined by a plurality of candidates targeted for decoding at a terminal, each of the candidates being formed by one or more control channel elements, CCEs; and a transmitting section that is adapted to allocate a PDCCH in any of the plurality of candidates targeted for decoding included in the configured search space and transmit the PDCCH to the terminal, wherein each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with a number of blind decoding operations for the PDCCH, characterized in that the configuration section is adapted to vary the association between each number of the one or more CCEs forming each of the candidates targeted for decoding and the number of the blind decoding operations for the PDCCH depending on if the PDCCH is to be transmitted along with relay physical downlink control channel, R-PDCCH, wherein each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with the number of the blind decoding operations for the PDCCH based on a first configuration rule if the PDCCH is to be transmitted without the R-PDCCH, each number of the one or more CCEs forming each of the candidates targeted for decoding is associated with the number of the blind decoding operations for the PDCCH based on a second configuration rule if the PDCCH is to be transmitted along with the R-PDCCH, and the first configuration rule is different from the second configuration rule such that the number of blind decoding operations with respect to larger numbers of the one or more CCEs is unchanged for the PDCCH in the second configuration rule and the number of blind decoding operations with respect to smaller numbers of the one or more CCEs is reduced for the PDCCH in the second configuration rule.