Base station, terminal and communication method
A base station capable of appropriately transmitting a reference signal in an unlicensed band and a reception quality report measured using said reference signal. A control unit ( 102 ) of a base station ( 100 ) changes: the reference signal transmission timing which was set before carrier sensing on the basis of a time resource set according to carrier sensing results; and/or the report timing of the quality information measured in a terminal 200 using the reference signal. A transmission unit ( 108 ) and a receiving unit ( 109 ) communicate the reference signal or quality information on the basis of the changed timing.
1. A base station comprising:
control circuitry, which, in operation, changes, in a time resource configured according to a result of carrier sense, a transmission timing of a reference signal which is unusable for a communication of the reference signal, to a timing determined to be usable in the result of the carrier sense, the transmission timing being configured prior to the carrier sense; and
communication circuitry, which, in operation, performs the communication based on the changed timing, wherein
the control circuitry, in operation, shifts the transmission timing to a downlink resource within the time resource when a resource corresponding to the transmission timing within the time resource is an uplink resource.
2. The base station according to claim 1 , wherein the control circuitry, in operation, shifts the timing into the time resource when a resource corresponding to the timing is different from the time resource.
3. The base station according to claim 1 , wherein the communication circuitry, in operation, indicates information indicating the changed timing to a terminal.
4. The base station according to claim 1 , wherein the control circuitry, in operation, shifts a reporting timing to another time resource configured according to a result of different carrier sense, when a resource corresponding to the reporting timing is different from the time resource.
5. A terminal comprising:
control circuitry, which, in operation, changes, in a time resource configured according to a result of carrier sense, a transmission timing of a reference signal from a base station which is unusable for a communication of the reference signal, to a timing determined to be usable in the result of the carrier sense, the transmission timing being configured prior to the carrier sense; and
communication circuitry, which, in operation, performs the communication based on the changed timing, wherein
the control circuitry, in operation, shifts the transmission timing to a downlink resource within the time resource when a resource corresponding to the transmission timing within the time resource is an uplink resource.
6. A communication method comprising:
changing, in a time resource configured according to a result of carrier sense, a transmission timing of a reference signal which is unusable for a communication of the reference signal, to a timing determined to be usable in the result of the carrier sense, the transmission timing being configured prior to the carrier sense; and
performing the communication based on the changed timing, wherein
the transmission timing is shifted to a downlink resource within the time resource when a resource corresponding to the transmission timing within the time resource is an uplink resource.
7. A communication method comprising:
changing, in a time resource configured according to a result of carrier sense, a transmission timing of a reference signal from a base station which is unusable for a communication of the reference signal, to a timing determined to be usable in the result of the carrier sense, the transmission timing being configured prior to the carrier sense; and
performing the communication based on the changed timing, wherein
the transmission timing is shifted to a downlink resource within the time resource when a resource corresponding to the transmission timing within the time resource is an uplink resource.