Base station, terminal, and communication method
The present invention improves transmission efficiency in unlicensed bands. This base station comprises: a control circuit for determining a cyclic prefix (CP) length coordinated between a terminal and the base station; and a transmission circuit for transmitting control information regarding the determined CP length to the terminal.
1 . A terminal, comprising:
reception circuitry, which, in operation, receives control information on a cyclic prefix (CP) length; and
control circuitry, which, in operation, controls sidelink transmission based on the CP length,
wherein the CP length is different between a first case where information indicating a channel occupancy time is a first value and a second case where information indicating a channel occupancy time is a second value.
2 . The terminal according to claim 1 , wherein the control information includes different information on CP lengths for different types of channel occupancy time.
3 . The terminal according to claim 2 , wherein:
a CP length that corresponds to a first type is based on timing alignment (TA), and
a CP length that corresponds to a second type is not based on the TA.
4 . The terminal according to claim 2 , wherein:
a CP length that corresponds to a first type is based on a category of carrier sensing, and
a CP length that corresponds to a second type is not based on the category.
5 . The terminal according to claim 1 , wherein the reception circuitry receives information on an index that is related to a table used to configure the CP length.
6 . The terminal according to claim 1 , wherein the reception circuitry receives information indicating a start timing of scheduling with respect to the terminal.
7 . The terminal according to claim 1 , wherein the reception circuitry receives information indicating a candidate timing of channel occupancy time for the terminal.
8 . The terminal according to claim 1 , wherein the control information includes different information on CP lengths for different priorities with respect to the sidelink transmission.
9 . The terminal according to claim 1 , wherein the control information is indicated by Radio Resource Control (RRC).
10 . The terminal according to claim 1 , wherein the control information is indicated for each terminal.
11 . The terminal according to claim 1 , wherein the CP length is different between a first case where a channel occupancy time is a first length and a second case where the channel occupancy time is a second length.
12 . The terminal according to claim 1 , wherein the CP length is different based on a subcarrier spacing.
13 . The terminal according to claim 1 , wherein a same CP length is configurable in a first case where a channel occupancy time is a first length and in a second case where a channel occupancy time is a second length.
14 . A communication method, comprising:
receiving, by a terminal, control information on a cyclic prefix (CP) length; and
controlling, by the terminal, sidelink transmission based on the CP length,
wherein the CP length is different between a first case where information indicating a channel occupancy time is a first value and a second case where information indicating a channel occupancy time is a second value.
15 . An integrated circuit, comprising:
reception circuitry, which, in operation, receives control information on a cyclic prefix (CP) length; and
control circuitry, which, in operation, controls sidelink transmission based on the CP length,
wherein the CP length is different between a first case where information indicating a channel occupancy time is a first value and a second case where information indicating a channel occupancy time is a second value.