Wireless communications system, communications apparatus, and processing method

A communications apparatus comprising:

• a memory;
• and
• a processor coupled to the memory, the processor configured to:
• use a predetermined band shared with a second wireless communications system and receive a wireless signal from a second communications apparatus,
• assign to the second communications apparatus, a first candidate and a second candidate for a utilization resource in the predetermined band by transmitting information about the first candidate and the second candidate using a physical downlink control channel (PDCCH);
• and
• receive the wireless signal transmitted by the second communications apparatus, the wireless signal being received by performing a reception process based on the first candidate and the second candidate assigned to the second communications apparatus,
• wherein assignment of the first candidate and the second candidate to the second communications apparatus is performed by allocating a plurality of subframes.

A communications apparatus comprising:

• a memory;
• and
• a processor coupled to the memory, the processor configured to:
• use a predetermined band shared with another wireless communications system and transmit a wireless signal to a second communications apparatus,
• perform radio resource idle state detection based on a result of assignment of a first candidate and a second candidate to the communications apparatus, the assignment being based on information received about the first candidate and the second candidate using a physical downlink control channel (PDCCH), the first candidate and the second candidate being for a utilization resource in the predetermined band;
• and
• transmit the wireless signal to the second communications apparatus, based on a result of the detection, the wireless signal being transmitted using the first candidate when the first candidate is idle, and the wireless signal being transmitted using the second candidate when the first candidate is not idle and the second candidate is idle,
• wherein the assignment of the first candidate and the second candidate to the communications apparatus by the second communications apparatus is performed by allocating a plurality of subframes.