Communication device, communication system, program, and data selection method

A non-transitory, computer-readable medium comprises instructions for causing a computer to perform the steps of:

• receiving a radio signal transmitted from a second communication device;
• measuring a field intensity of the radio signal
• measuring a noise component of the radio signal;
• determining whether the noise component satisfies a predetermined condition
• estimating a distance from the second communication device based on the field intensity of the radio signal;
• and
• selecting data from a plurality of data stored in a memory unit based on the measured field intensity, noise component determination, and estimated distance.

A data selection method in a communication device comprising the steps of:

• receiving a radio signal transmitted from a second communication device;
• measuring a field intensity of the radio signal
• measuring a noise component of the radio signal;
• determining whether the noise component satisfies a predetermined condition
• estimating a distance from the second communication device based on the field intensity of the radio signal;
• and
• selecting data from a plurality of data stored in a memory unit based on the measured field intensity, noise component determination, and estimated distance.

A communication system comprising:

• a communication device comprising:
• a memory unit that stores a plurality of data,
• a distance information obtaining unit comprising:
• a reception unit that receives a radio signal transmitted from a second communication device;
• a measurement unit that measure a field intensity of the radio signal;
• a noise floor measurement unit that measures a noise component of the radio signal;
• a determination unit that determines whether the noise component satisfies a predetermined condition;
• and
• an estimation unit that estimates a distance from the second communication device based on the field intensity of the radio signal;
• a data selection unit that selects data from the plurality of data stored in the memory unit based on the distance information obtained by the distance information obtaining unit;
• and
• the radio communication device that performs radio communication with the communication device.