Wireless communication base station device, wireless communication terminal device and CCE allocation method

摘要

Disclosed is a wireless communication base station device that can suppress increases in terminal power consumption while being able to perform CCE allocation flexibly. In the device, a search space setting unit (103) sets search space for each wireless communication terminal device that communicates using multiple downlink unit bands. When the aggregation level of a CCE that is allocated control information addressed to the wireless communication terminal devices is less than a threshold value, an allocating unit (106) allocates the control information to a CCE inside the search space established in a single one of the multiple downlink unit bands. When the aggregation level is greater than the threshold value, the control information is allocated distributed to the CCEs inside the search spaces established for each of the multiple downlink unit bands.

主权项

1. A radio communication base station apparatus comprising:
a setting section that, for a radio communication terminal apparatus that communicates using a plurality of downlink component bands, allocates a search space to each the radio communication terminal apparatus; and an allocation section that, when an aggregation level of control information addressed to the radio communication terminal apparatus is less than or equal to a threshold value, allocates the control information to at least one control channel element (CCE) within a first search space allocated to at least one downlink component band among the plurality of downlink component bands, and when the aggregation level is greater than the threshold value, allocates the control information to CCEs within a second search space allocated so as to be distributed among the plurality of downlink component bands, the aggregation level being a first number of CCEs occupied by the control information, wherein: the first number of CCEs within the second search space being distributed among the plurality of downlink component bands in units of a second number of CCEs, the second number of CCEs being one of aggregation levels that are less than or equal to the threshold value.