Communication apparatus, control method, and storage medium

A first communication apparatus comprising:

• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus;
• and
• a processor which functions as:
• a determination unit configured to determine whether a collision occurred between wireless transmissions performed by a plurality of communication apparatuses, based on a reception signal received via the reception circuit, wherein the determination unit determines that the collision occurred, in a case where there is a bit error in the reception signal;
• and
• a control unit configured to, in a case where the collision occurred, perform control to transmit a retransmission request to the second communication apparatus via the transmission circuit.

A first communication apparatus comprising:

• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus;
• and
• a processor which functions as
• a control unit configured to, in a case where, after a first transmission signal is transmitted to the second communication apparatus via the transmission circuit, a first retransmission request is received from the second communication apparatus via the reception circuit, perform control to retransmit the first transmission signal to the second communication apparatus via the transmission circuit,
• wherein, in a case where the first retransmission request includes information indicating that a plurality of retransmission requests including the first retransmission request is transmitted by the second communication apparatus, the control unit performs control to retransmit the first transmission signal after the plurality of retransmission requests are received via the reception circuit.

A control method executed by a first communication apparatus, wherein

• the first communication apparatus comprises:
• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• and
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus, and
• the control method comprises:
• determining whether a collision occurred between wireless transmissions performed by a plurality of communication apparatuses, based on a reception signal received via the reception circuit, wherein the reception signal is a pulse sequence, and whether the collision occurred is determined based on at least one of a frequency and a pulse width of the pulse sequence;
• and
• in a case where the collision occurred, performing control to transmit a retransmission request to the second communication apparatus via the transmission circuit.

A control method executed by a first communication apparatus, wherein

• the first communication apparatus comprises:
• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• and
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus, and
• the control method comprises
• in a case where, after a first transmission signal is transmitted to the second communication apparatus via the transmission circuit, a first retransmission request is received from the second communication apparatus via the reception circuit, performing control to retransmit the first transmission signal to the second communication apparatus via the transmission circuit,
• wherein, in a case where the first retransmission request includes information indicating that a plurality of retransmission requests including the first retransmission request is transmitted by the second communication apparatus, the first transmission signal is retransmitted after the plurality of retransmission requests are received via the reception circuit.

A non-transitory computer-readable storage medium which stores a program for execution by a processor of a first communication apparatus, wherein

• the first communication apparatus comprises:
• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• and
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus, and
• the program, when executed by the processor, causes the processor to perform:
• determining whether a collision occurred between wireless transmissions performed by a plurality of communication apparatuses, based on a reception signal received via the reception circuit, wherein the reception signal is a pulse sequence, and whether the collision occurred is determined based on at least one of a frequency and a pulse width of the pulse sequence;
• and
• in a case where the collision occurred, performing control to transmit a retransmission request to the second communication apparatus via the transmission circuit.

A non-transitory computer-readable storage medium which stores a program for execution by a processor of a first communication apparatus, wherein

• the first communication apparatus comprises:
• a transmission circuit including a transmitting coil and configured to perform wireless transmission to a second communication apparatus through inductive coupling between the transmitting coil of the first communication apparatus and a receiving coil of the second communication apparatus;
• and
• a reception circuit including a receiving coil and configured to perform wireless reception from the second communication apparatus through inductive coupling between the receiving coil of the first communication apparatus and a transmitting coil of the second communication apparatus, and
• the program, when executed by the processor, causes the processor to perform
• in a case where, after a first transmission signal is transmitted to the second communication apparatus via the transmission circuit, a first retransmission request is received from the second communication apparatus via the reception circuit, performing control to retransmit the first transmission signal to the second communication apparatus via the transmission circuit,
• wherein, in a case where the first retransmission request includes information indicating that a plurality of retransmission requests including the first retransmission request is transmitted by the second communication apparatus, the first transmission signal is retransmitted after the plurality of retransmission requests are received via the reception circuit.