US 8,897,250 B2 · Terminal apparatus and method for transmitting a response signal at a terminal

Abstract

A radio communication mobile station device reduces the number of blind decoding processes at a mobile station without increasing overhead by report information. The device includes a judgment unit which judges a particular PUCCH to which a response signal corresponding to the downstream line data is to be allocated among a plurality of PUCCH, according to a CCE occupied by PDCCH allocated to a particular search space corresponding to a CCE aggregation size or the PDCCH to which allocation information destined to the local station is allocated among search spaces changing in accordance with the CFI value; and a control unit which controls a cyclic shift amount of a ZAC sequence of the response signal and a block-wise spread code sequence according to a correspondence between CCE occupied by PDCCH allocated to a particular search space and a particular PUCCH resource, the correspondence changing in accordance with the CFI value.

Claims20

Dependent claims

A terminal apparatus comprising:

a decoding section configured to decode a downlink control channel, which is transmitted on one or more control channel element(s) (CCE(s)) with consecutive CCE number(s) from a base station, in a search space that is comprised of a plurality of CCEs;
and
a transmitting section configured to transmit a response signal to the base station on a uplink control channel, an index of which is associated with a CCE number of the CCE, on which the downlink control channel is transmitted,
wherein:
the search space is comprised of the plurality of CCEs corresponding to a plurality of downlink control channel candidates to be attempted to be decoded;
and
the search space for each aggregation size corresponding to a number of the CCE(s), on which the downlink control channel is transmitted, is comprised of the plurality of CCEs that are defined by starting on a CCE with a CCE number, which depends on both a total number of CCEs in a subframe and the aggregation size, and at least part of the search space for the each aggregation size is comprised of CCEs with consecutive CCE numbers.

4 more elements

Dependencies are inferred from the claim text.

Terminal apparatus and method for transmitting a response signal at a terminal

Life of this patent

Terminal apparatus and method for transmitting a response signal at a terminal

Life of this patent

Abstract

Claims20