Patent ID: 9118453
Filing Date: 2015-08-25
Classification: H04L,H04W

Abstract:
1. A base station that transmits data to a terminal using a plurality of downlink component carriers, the base station comprising: a component carrier setting section that sets the plurality of downlink component carriers for the terminal and sets control channel component carriers for transmitting assignment information relating to data transmission resources of each downlink component carrier from among the plurality of downlink component carriers, wherein the component carrier setting section associates one of the control channel component carriers only with a first downlink component carrier among the plurality of downlink component carriers and associates a plurality of the control channel component carriers with a second downlink component carrier among the plurality of downlink component carriers; and a transmitting section that transmits the data and the assignment information, using the plurality of downlink component carriers and the control channel component carriers set by the component carrier setting section, wherein the component carrier setting section uses at least one selection criteria for setting the first and second downlink component carriers, wherein any of the following sets of selection criteria (1) to (5) for setting the first and second downlink component carriers are used: (1) the first downlink component carrier has a better average channel situation over a long time than the second downlink component carrier; (2) the first downlink component carrier has a better channel quality than the second downlink component carrier; (3) the first downlink component carrier has a higher transmission power than the second downlink component carrier; (4) the first downlink component carrier receives a smaller other cell interference than the second downlink component carrier; and (5) the first downlink component carrier itself is selected as an only PDCCH component carrier, and the second downlink component carrier itself and a component carrier having a greater transmission power are selected as PDCCH component carriers.