Base station, terminal, retransmission control method, and response method

摘要

Disclosed is a base station which can prevent degradation in the reception characteristics of nearby cells when carrier aggregation and channel selection are applied. In accordance with the resistance to interference of a plurality of uplink component carriers of a femtocell, a response protocol controller (101) in a base station (100) changes combination rules for the uplink component carriers and signal points which a terminal (200) in a microcell covered by the base station (100) uses in the feedback of a response signal. Information in relation to the combination rules is notified to the terminal (200). A controller (217) in the terminal (200) changes the combination rules for the uplink component carriers and the signal points of the microcell covered by the base station (100) in accordance with the information notified from the base station (100), and controls transmission of the response signal in accordance with said rules.

主权项

1. A base station comprising:
a controller configured to determine a rule for associating a combination of a component carrier and constellation points with patterns about successful reception of each of downlink data transmitted using a plurality of component carriers in a channel selection, based on a relative relationship about a parameter related to interference robustness among the plurality of component carriers in a plurality of cells, the component carrier and the constellation points being used by a terminal to feed back a response signal for downlink data transmitted using the plurality of component carriers, the channel selection being performed such that the response signal is fed back by changing the combination of the component carrier and the constellation points according to a pattern about successful reception of each of the downlink data transmitted using the plurality of component carriers; a receiver configured to receive the response signal; and an identification section configured to identify the pattern about successful reception from a combination of the component carrier and the constellation points that are used to feed back the response signal, based on the rule, wherein according to the rule, in the case where the downlink data is transmitted using two component carriers among the plurality of component carriers and a first component carrier has higher interference robustness than a second component carrier of the two component carriers in a first cell among the plurality of cells, and a total of probabilities that the constellation point contained in a constellation associated with the first component carrier of a second cell different from the first cell is used is higher than a total of probabilities that the constellation point contained in a constellation associated with the second component carrier of the second cell is used.