A user terminal comprising: a receiver configured to receive, from a base station, feedback control information for determining by the user terminal whether to transmit a required gap pattern within a reception gap request to the base station, wherein the feedback control information is included in system information or dedicated signaling; and a controller configured to execute processes of: determining whether to transmit the required gap pattern within the reception gap request to the base station, based on the feedback control information; in case of determining that the required gap pattern is to be transmitted within the reception gap request, transmitting the required gap pattern within the reception gap request to a base station, the reception gap request requesting reception gaps which are timings in which the user terminal halts a downlink reception to monitor device-to-device discovery signals directly transmitted from other user terminals; and receiving a gap configuration from the base station, the gap configuration indicating the reception gaps configured by the base station to the user terminal, wherein the transmitted reception gap request includes: a frequency identifier indicating a frequency to be used for monitoring the device-to-device discovery signals; and a gap pattern correlated with the frequency identifier, the gap pattern including: bit map information indicating subframes corresponding to the reception gaps; period information indicating a predetermined period by which the bit map information is repeated; and offset information indicating a start timing of the predetermined period. a receiver configured to receive, from a base station, feedback control information for determining by the user terminal whether to transmit a required gap pattern within a reception gap request to the base station, wherein the feedback control information is included in system information or dedicated signaling; and a controller configured to execute processes of: determining whether to transmit the required gap pattern within the reception gap request to the base station, based on the feedback control information; in case of determining that the required gap pattern is to be transmitted within the reception gap request, transmitting the required gap pattern within the reception gap request to a base station, the reception gap request requesting reception gaps which are timings in which the user terminal halts a downlink reception to monitor device-to-device discovery signals directly transmitted from other user terminals; and receiving a gap configuration from the base station, the gap configuration indicating the reception gaps configured by the base station to the user terminal, wherein the transmitted reception gap request includes: a frequency identifier indicating a frequency to be used for monitoring the device-to-device discovery signals; and a gap pattern correlated with the frequency identifier, the gap pattern including: bit map information indicating subframes corresponding to the reception gaps; period information indicating a predetermined period by which the bit map information is repeated; and offset information indicating a start timing of the predetermined period. determining whether to transmit the required gap pattern within the reception gap request to the base station, based on the feedback control information; in case of determining that the required gap pattern is to be transmitted within the reception gap request, transmitting the required gap pattern within the reception gap request to a base station, the reception gap request requesting reception gaps which are timings in which the user terminal halts a downlink reception to monitor device-to-device discovery signals directly transmitted from other user terminals; and receiving a gap configuration from the base station, the gap configuration indicating the reception gaps configured by the base station to the user terminal, wherein the transmitted reception gap request includes: a frequency identifier indicating a frequency to be used for monitoring the device-to-device discovery signals; and a gap pattern correlated with the frequency identifier, the gap pattern including: bit map information indicating subframes corresponding to the reception gaps; period information indicating a predetermined period by which the bit map information is repeated; and offset information indicating a start timing of the predetermined period. a frequency identifier indicating a frequency to be used for monitoring the device-to-device discovery signals; and a gap pattern correlated with the frequency identifier, the gap pattern including: bit map information indicating subframes corresponding to the reception gaps; period information indicating a predetermined period by which the bit map information is repeated; and offset information indicating a start timing of the predetermined period. bit map information indicating subframes corresponding to the reception gaps; period information indicating a predetermined period by which the bit map information is repeated; and offset information indicating a start timing of the predetermined period.