Transmission device, reception device, transmission method, and reception method

摘要

In a base station (100), a division number calculating unit (103) calculates the division number of a PRB pair on the basis of a first number of REs capable of mapping an allocation control signal, a second number of REs capable of mapping signals other than the allocation control signal, and a reference value, which is the number of REs satisfying the reception quality request in a terminal (200) for the allocation control signal, in each PRB pair. Then, a control signal mapping control unit (104) determines a search space by determining a control channel element group constituting a plurality of mapping unit resource region candidates within a CCE group obtained by separating each PRB pair contained in a first group into the same number as the division number.

主权项

1. A terminal apparatus comprising:
a division number calculator which, in operation, calculates a division number based on a number of OFDM symbols used for an Enhanced Physical Downlink Control CHannel (EPDCCH), the division number being a number of Control Channel Elements (CCEs) per resource block pair, the EPDCCH being a resource region that is defined in a data region of a subframe and that is configured to transmit either of downlink control information and downlink data, wherein the division number calculator, in operation, calculates the division number such that the division number for a subframe having a Normal cyclic prefix length is larger than the division number for a subframe having an Extended cyclic prefix length; a controller which, in operation, uses the division number to specify a plurality of resource region candidates, each resource region candidate including at least one CCE; and a decoder which, in operation, decodes the plurality of resource region candidates to obtain the downlink control information.