Communication device, communication system, and recording medium

A communication system, comprising:

• a first communication device;
• and
• a second communication device to communicate with the first communication device in each of time divisions defined by shared time that is shared with the first communication device,
• the second communication device including
• first processing circuitry
• to measure the shared time,
• to acquire, from the first communication device, error information about a first error of the first communication device in measuring the shared time, and
• to specify, to the first communication device, a suspension duration at least at a start or at an end of each of the time divisions, the suspension duration being a duration for which the first communication device suspends data transmission,
• the specified suspension duration being greater than or equal to a greater error of the first error and a second error that is an error of the processing circuitry in time measurement,
• the first communication device including
• second processing circuitry
• to transmit the error information to the second communication device, and
• to set the specified suspension duration.