Patent ID: 8687657

Claim:
A base station apparatus for use in a mobile communication system in which synchronization type automatic retransmission control is performed, comprising: a determination unit configured to determine which mode of a subframe bundling mode and a non-bundling mode should be used by a user apparatus for communication; a control signal generation unit configured to generate a control signal that includes information of a determination result; and a transmission unit configured to transmit the control signal to the user apparatus, wherein the control signal generation unit generates the control signal such that, in the case of the non-bundling mode, a round trip time (RTT) from transmission of a signal by the user apparatus to retransmission of the signal is a first period, and each of transmission and retransmission of the signal is performed by a radio resource over a unit transmission period, in the case of the subframe bundling mode, the round trip time is a second period longer than the first period, and each of transmission and retransmission of the signal is performed by a radio resource over a plurality of unit transmission periods, and a radio resource to be used for retransmission by the user apparatus of the non-bundling mode is determined according to a first frequency hopping pattern, and a radio resource to be used for retransmission by the user apparatus of the subframe bundling mode is determined according to a second frequency hopping pattern that is different from the first frequency hopping pattern.