Wireless communication base station equipment, wireless communication terminal device and search space setting method

摘要

Disclosed is wireless communication base station equipment in which CCE allocation can be flexibly performed without collision of ACK/NACK signals between a plurality of unit bands, even when wideband transmission is performed exclusively on a downlink circuit. In this equipment, an allocation unit (105) sets up mutually different search spaces for each of a plurality of downlink unit bands, with respect to wireless communication terminal devices that communicate using a plurality of downlink unit bands, and allocates resource allocation information of downlink circuit data destined for the wireless communication terminal devices to CCEs in mutually different search spaces for each of the plurality of downlink unit bands, and an ACK/NACK reception unit (119); extracts a response signal in respect of the downlink circuit data from the uplink control channel associated with the CCE to which the resource allocation information of this downlink circuit data was allocated.

主权项

1. An integrated circuit, comprising:
assignment circuitry, which, in operation, assigns a downlink control channel for a terminal, for which one or multiple component carriers (CC(s)) are configured, to a control channel element (CCE) in a first search space comprised of a plurality of CCEs, wherein the downlink control channel includes resource assignment information indicating a resource allocated to the terminal in a component carrier n (CCn) out of the configured CC(s); and transmission circuitry, which, in operation, transmits the downlink control channel to the terminal on the CCE, wherein the first search space, in which the downlink control channel including the resource assignment information indicating the resource allocated in the CCn is assigned, is comprised of the plurality of CCEs depending on the value of n, and wherein a CCE number that defines an end position of the first search space for the CCn and a CCE number that defines a start position of a second search space for a component carrier n+1 (CCn+1) are consecutive, the second search space being different from the first search space.