Ntt Docomo, Inc.

Kiichi Tateishi

Yoshihisa Kishiyama

A user apparatus is provided. The user apparatus performs communications with a base station. The user apparatus includes a receiving unit configured to receive a downlink pilot signal, a downlink control signal, and downlink user data by using a subframe that includes a pilot signal area, to which the downlink pilot signal is mapped, a control signal area, to which the downlink control signal is mapped, a user data area, to which the downlink user data is mapped, and a multiple use area, to which an uplink signal or a downlink signal is mapped; and a transmission unit configured to map the uplink signal to the multiple use area and transmit the mapped result to the base station in the case where information is included in the downlink control signal indicating that the uplink signal is to be mapped to the multiple use area.

User apparatus and base station

User equipment for communicating with a base station in a radio communication system supporting communication based on a TDD scheme, the user equipment including a transmitter that transmits an uplink signal while setting a guard time in the uplink signal based on a report signal indicating a structure for each subframe, the report signal being transmitted from the base station; a receiver that receives a downlink signal from the base station; and an identification unit that identifies, based on the report signal, a position of a guard time that is set in the downlink signal received by the receiver.

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Tokyo, Japan

Kiichi Tateishi