Terminals and communication methods

Abstract

Perform direct terminal-to-terminal communication that complies with the regulations in the unlicensed band. [Solution] The terminal has a receiving unit that receives a control channel and a first shared channel from other terminals in a resource pool in a frequency band where LBT (Listen before talk) is performed in channel access; a control unit that performs LBT in each of a plurality of bands before transmitting a feedback channel corresponding to the first shared channel; and a transmitting unit that transmits the feedback channel in the band among the plurality of bands where LBT was successful. The control unit determines which resource in the resource pool will transmit the second shared channel, and if the transmitting unit has performed other transmissions prior to the transmission on the determined resource, it will perform the transmission of the second shared channel using at least a portion of the period between the resource that performed the other transmissions and the determined resource.

Claims

1. In a resource pool in a frequency band where LBT (Listen before talk) is performed for channel access, a receiving unit receives the control channel and the first shared channel from other terminals, A control unit that performs LBT in each of a plurality of bandwidths before transmitting the feedback channel corresponding to the first shared channel, The system includes a transmitting unit that transmits the feedback channel in the band among the multiple bands in which LBT is successful, The control unit determines the resource to transmit the second shared channel in the resource pool, The transmitting unit is a terminal that, if it has performed other transmissions prior to the transmission on the determined resource, performs the transmission on the second shared channel using at least a portion of the period between the resource on which the other transmissions were performed and the determined resource.

2. The terminal according to claim 1, wherein the transmitting unit transmits the feedback channel to the other terminal when LBT is successful in all of the multiple bandwidths.

3. The terminal according to claim 1, wherein the control unit performs LBT before transmission on the feedback channel based on a notification relating to LBT notified via the control channel corresponding to the feedback channel and the first shared channel.

4. In a resource pool in a frequency band where LBT (Listen before talk) is performed for channel access, the procedure for receiving the control channel and the first shared channel from other terminals, A procedure for performing LBT in each of multiple bandwidths before transmitting the feedback channel corresponding to the first shared channel, A procedure for transmitting the feedback channel in the band among the multiple bands in which LBT was successful, A procedure for determining the resource to transmit the second shared channel in the resource pool, A communication method in which a terminal performs a procedure to perform a second shared channel transmission using at least a portion of the time between the resource on which the other transmission was performed and the resource on which the determined resource was performed, if the terminal had performed another transmission prior to the transmission on the determined resource.

Images