Terminal device, base station device, and communication method

A base station device that communicates with a terminal device that performs synchronous communications with the base station device, the base station device comprising:

• a wireless transceiver;
• and
• control circuitry,
• wherein the control circuitry:
• receives, from the terminal device via the wireless transceiver, determination information for determining whether or not to extend a channel occupancy time (COT) that has been previously assigned to the terminal device by the base station device;
• transmits information regarding the previously assigned COT to the terminal device, the information regarding the previously assigned COT being based on the determination information;
• and
• receives an uplink transmission from the terminal device based on the information regarding the previously assigned COT,
• wherein, in a case where the information regarding the previously assigned COT does not indicate that the previously assigned COT may be extended, the previously assigned COT is not extended so that the uplink transmission ends at least by a first sync boundary corresponding to the previously assigned COT, and
• in a case where the information regarding the previously assigned COT indicates that the previously assigned COT may be extended, the previously assigned COT is extended so that the uplink transmission ends by a second sync boundary that occurs after the first sync boundary,
• wherein the determination information includes each of:
• information regarding a carrier sensing result at a sync boundary prior to the first sync boundary,
• information regarding a timing at which the previously assigned COT has been acquired,
• information regarding a timing at which the uplink transmission is to be started,
• information regarding a maximum COT length, and
• a channel access priority class (CAPC).

A communication method executed by a terminal device that performs synchronous communications with a base station, the communication method comprising:

• transmitting, to the base station, determination information for determining whether or not to extend a channel occupancy time (COT) that has been previously assigned to the terminal device by the base station;
• receiving information regarding the previously assigned COT from the base station, the information regarding the previously assigned COT being based on the determination information;
• and
• performing an uplink transmission to the base station based on the information regarding the previously assigned COT,
• wherein, in a case where the information regarding the previously assigned COT does not indicate that the previously assigned COT may be extended, the previously assigned COT is not extended so that the uplink transmission ends at least by a first sync boundary corresponding to the previously assigned COT, and
• in a case where the information regarding the previously assigned COT indicates that the previously assigned COT may be extended, the previously assigned COT is extended so that the uplink transmission ends by a second sync boundary that occurs after the first sync boundary,
• wherein the determination information includes each of:
• information regarding a carrier sensing result at a sync boundary prior to the first sync boundary,
• information regarding a timing at which the previously assigned COT has been acquired,
• information regarding a timing at which the uplink transmission is to be started,
• information regarding a maximum COT length, and
• a channel access priority class (CAPC).

A communication method executed by a base station device that communicates with a terminal device that performs synchronous communications with the base station device, the communication method comprising:

• receiving, from the terminal device, determination information for determining whether or not to extend a channel occupancy time (COT) that has been previously assigned to the terminal device by the base station device;
• transmitting information regarding the previously assigned COT to the terminal device, the information regarding the previously assigned COT being based on the determination information;
• and
• receiving an uplink transmission from the terminal device based on the information regarding the previously assigned COT,
• wherein, in a case where the information regarding the previously assigned COT does not indicate that the previously assigned COT may be extended, the previously assigned COT is not extended so that the uplink transmission ends at least by a first sync boundary corresponding to the previously assigned COT, and
• in a case where the information regarding the previously assigned COT indicates that the previously assigned COT may be extended, the previously assigned COT is extended so that the uplink transmission ends by a second sync boundary that occurs after the first sync boundary,
• wherein the determination information includes each of:
• information regarding a carrier sensing result at a sync boundary prior to the first sync boundary,
• information regarding a timing at which the previously assigned COT has been acquired,
• information regarding a timing at which the uplink transmission is to be started,
• information regarding a maximum COT length, and
• a channel access priority class (CAPC).