Terminal, radio communication system, and communication method

A radio communication system, comprising:

• a base station and a terminal,
• wherein the base station includes a first transmitter configured to transmit configuration information on inter-terminal direct communication to the terminal;
• and
• the terminal includes:
• a receiver configured to receive information on a symbol position in a resource pool included in the configuration information on the inter-terminal direct communication;
• a processor configured to control sidelink transmission in the resource pool based on symbols that are indicated by the information on the symbol position and are usable for the sidelink transmission in the radio resource constituting the resource pool;
• and
• a second transmitter configured to transmit data on a physical sidelink shared channel (PSSCH) within the symbols;
• the receiver is configured to receive sidelink control information (SCI) in a physical sidelink control channel (PSCCH) from another terminal;
• the processor is configured to measure a reception level based on the PSCCH and determine whether a radio resource for the sidelink transmission is usable based on the reception level;
• and
• the processor is configured to determine to not use the radio resource for transmission when the reception level of the PSCCH is higher than a threshold.

A communication method performed by a terminal, the communication method comprising:

• receiving sidelink control information (SCI) in a physical sidelink control channel (PSCCH) from another terminal;
• measuring a reception level based on the PSCCH;
• determining whether a radio resource for sidelink transmission is usable based on the reception level;
• and
• transmitting data via a physical sidelink shared channel (PSSCH) within the radio resource,
• wherein the radio resource is determined to be not used for transmission when the reception level of the PSCCH is higher than a threshold.