Communication system, communication apparatus, communication method, and program to reduce communication time in near field communications

A communication device which starts communication by outputting an electromagnetic wave, and transmits a command by the electromagnetic wave, comprising:

• a first transmission control means for causing a command where a first value is set in time slot information to be transmitted when, of passive mode communication and simple mode communication, the passive mode communication is performed,
• the passive mode communication including
• transmitting the command including the time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by a target, which is a communication device that transmits the response to the command by load-modulating the electromagnetic wave, at a timing of any one of one or more time slots and including an ID (Identification) for identifying the target,
• to acquire the ID for identifying the target, and identify the target by the ID,
• the simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by the target at a timing of any one of one or more time slots and including real data,
• to acquire the real data;
• and
• a second transmission control means for causing the command where a second value different from the first value is set in the time slot information to be transmitted when the simple mode communication is performed.

A communication method for a communication device that starts communication by outputting an electromagnetic wave, and transmits a command via the electromagnetic wave, comprising the steps of:

• causing a command where a first value is set in time slot information to be transmitted when, of passive mode communication and simple mode communication, the passive mode communication is performed,
• the passive mode communication including
• transmitting the command including the time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by a target, which is a communication device that transmits the response to the command by load-modulating the electromagnetic wave, at a timing of any one of one or more time slots and including an ID (Identification) for identifying the target,
• to acquire the ID for identifying the target, and identify the target by the ID,
• the simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by the target at a timing of any one of one or more time slots and including real data,
• to acquire the real data;
• and
• causing the command where a second value different from the first value is set in the time slot information to be transmitted when the simple mode communication is performed.

A program stored in a non-transitory medium and executed by a computer, the program having instructions that when executed by the computer controlling a communication device, which starts communication by outputting an electromagnetic wave and transmits a command via the electromagnetic wave, the program causing the computer to execute a process comprising the steps of:

• causing within a processor a command where a first value is set in time slot information to be transmitted when, of passive mode communication and simple mode communication, the passive mode communication is performed,
• the passive mode communication including
• transmitting the command including the time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by the target at a timing of any one of one or more time slots and including an ID (Identification) for identifying the target,
• to acquire the ID for identifying the target, and identify the target by the ID,
• the simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by a target, which is a communication device that transmits the response to the command by load-modulating the electromagnetic wave, at a timing of any one of one or more time slots and including real data,
• to acquire the real data;
• and
• causing the command where a second value different from the first value is set in the time slot information to be transmitted when the simple mode communication is performed.

A communication device which transmits, to an initiator as a communication device that starts communication by outputting an electromagnetic wave and transmits a command via the electromagnetic wave, a response to the command by load-modulating the electromagnetic wave, comprising,

• when the initiator can perform
• passive mode communication including
• transmitting a command including time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including an ID (Identification) for identifying the communication device,
• to acquire the ID for identifying the communication device, and identify the communication device by the ID, and
• simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including real data,
• to acquire the real data,
• in the passive mode communication, the command where a first value is set in the time slot information is transmitted, and
• in the simple mode communication, the command where a second value different from the first value is set in the time slot information is transmitted:
• recognizing means for recognizing the time slot information included in the command from the initiator;
• a first transmission control means for determining a time slot for transmitting the response by a random number, and causing the response including the ID for identifying the communication device to be transmitted at a timing of the time slot determined by the random number, when the time slot information has the first value;
• and
• a second transmission control means for causing the response including the real data to be transmitted at a timing of a preset time slot, when the time slot information has the second value.

A communication method for a communication device, the communication device transmitting, to an initiator as a communication device that starts communication by outputting an electromagnetic wave and transmits a command via the electromagnetic wave, a response to the command by load-modulating the electromagnetic wave, comprising the steps of,

• when the initiator can perform
• passive mode communication including
• transmitting a command including time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including an ID (Identification) for identifying the communication device,
• to acquire the ID for identifying the communication device, and identify the communication device by the ID, and
• simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including real data,
• to acquire the real data,
• in the passive mode communication, the command where a first value is set in the time slot information is transmitted, and
• in the simple mode communication, the command where a second value different from the first value is set in the time slot information is transmitted:
• recognizing the time slot information included in the command from the initiator;
• determining a time slot for transmitting the response by a random number, and causing the response including the ID for identifying the communication device to be transmitted at a timing of the time slot determined by the random number, when the time slot information has the first value;
• and
• causing the response including the real data to be transmitted at a timing of a preset time slot, when the time slot information has the second value.

A program stored in a non-transitory medium and executed by a computer, the program having instructions that when executed by the computer controlling a communication device, the communication device transmitting, to an initiator as a communication device that starts communication by outputting an electromagnetic wave and transmits a command via the electromagnetic wave, a response to the command by load-modulating the electromagnetic wave, the program causing the computer to execute a process comprising the steps of:

• when the initiator can perform
• passive mode communication including
• transmitting a command including time slot information related to a time slot, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including an ID (Identification) for identifying the communication device,
• to acquire the ID for identifying the communication device, and identify the communication device by the ID, and
• simple mode communication including
• transmitting the command, and
• receiving a response to the command, the response being transmitted by the communication device at a timing of any one of one or more time slots and including real data,
• to acquire the real data,
• in the passive mode communication, the command where a first value is set in the time slot information is transmitted, and
• in the simple mode communication, the command where a second value different from the first value is set in the time slot information is transmitted:
• recognizing the time slot information included in the command from the initiator;
• determining within a processor a time slot for transmitting the response by a random number, and causing the response including the ID for identifying the communication device to be transmitted at a timing of the time slot determined by the random number, when the time slot information has the first value;
• and
• causing the response including the real data to be transmitted at a timing of a preset time slot, when the time slot information has the second value.