Communication system, communication device, and power saving method

A communication device, comprising:

• a first communication unit, comprising a first wireless communication chip, in which first identification information is set;
• and
• a second communication unit, comprising a second wireless communication chip, in which second identification information different from the first identification information is set,
• the second communication unit being configured to operate using less power than the first communication unit,
• the second communication unit being configured to transmit the second identification information when a state of the first communication unit is an OFF state,
• the communication device further configured to switch the state of the first communication unit to an ON state when the second communication unit receives a predetermined signal transmitted from a communication partner device configured to receive the second identification information,
• the first communication unit switched to an ON state being configured to start to communicate data to be used for predetermined information processing to and from the communication partner device without transmitting the first identification information to the communication partner device by the second communication unit,
• wherein the first identification information is associated with the second identification information in the communication partner device before the second identification information is transmitted to the communication partner device.

A communication device configured to:

• store correspondence data indicating a correspondence between first identification information and second identification information different from the first identification information, the first identification information being identification information on a first communication unit, comprising a first wireless communication chip, included in a communication partner device, and the second identification information being identification information on a second communication unit, comprising a second wireless communication chip, included in the communication partner device;
• identify, based on the correspondence data, the first identification information associated with the second identification information received from the second communication unit when a state of the first communication unit is an OFF state;
• transmit a predetermined signal to the second communication unit when the second identification information is received;
• and
• communicate data to be used for predetermined information processing to and from the first communication unit switched to an ON state in response to the reception of the predetermined signal by the second communication unit,
• wherein the first identification information is associated with the second identification information in the communication partner device before the second identification information is transmitted to the communication partner device.

A power saving method, comprising:

• transmitting a second identification information when a state of a first communication unit, comprising a first wireless communication chip, is an OFF state, by a second communication unit, comprising a second wireless communication chip, of a first communication device including the first communication unit in which first identification information is set as identification information and the second communication unit in which the second identification information different from the first identification information is set as identification information, the second communication unit being configured to operate using less power than the first communication unit;
• identifying the first identification information associated with the second identification information received from the second communication unit, by a second communication device configured to store correspondence data indicating a correspondence between the first identification information and the second identification information, based on the correspondence data, wherein the first identification information is associated with the second identification information in the second communication device before the second identification information is received by the second communication device;
• transmitting a predetermined signal to the second communication unit when the second identification information is received, by the second communication device;
• switching the state of the first communication unit to an ON state when the second communication unit receives the predetermined signal transmitted from the second communication device, by the first communication device;
• and
• starting to communicate data to be used for predetermined information processing to and from the second communication device, by the first communication unit switched to an ON state.