Wireless LAN device and controlling method thereof

1. A wireless local area network (LAN) device that wirelessly communicates using a specific frequency channel shared by a radar and a wireless LAN system, the wireless LAN device comprising:

a plurality of antennas;

a wireless communication unit including a plurality of transceiver circuits respectively provided for each of the plurality of antennas; and

a controller that controls the wireless communication unit, wherein

the wireless communication unit wirelessly communicates in accordance with a multiple input multiple output (MIMO) scheme by the plurality of transceiver circuits, and

the controller controls the wireless communication unit to execute radar wave monitoring on a frequency channel different from a frequency channel in use for wireless communication using one of the plurality of transceiver circuits when the frequency channel in use for the wireless communication is the specific frequency channel.

2. The wireless LAN device according to claim 1 , wherein

the controller controls the wireless communication unit to switch the frequency channel in use to a frequency channel in which a radar wave is not detected by the radar wave monitoring when a radar wave is detected in the frequency channel in use.

3. The wireless LAN device according to claim 1 , wherein

when the frequency channel in use is the specific frequency channel, the controller controls the wireless communication unit to execute the radar wave monitoring using the one of the plurality of transceiver circuits and to wirelessly communicate in accordance with the MIMO scheme using the remaining transceiver circuits simultaneously.

4. The wireless LAN device according to claim 1 , wherein

the controller controls the wireless communication unit to wirelessly communicate in accordance with the MIMO scheme using all of the plurality of transceiver circuits when the frequency channel in use is not the specific frequency channel.

5. The wireless LAN device according to claim 1 , wherein

the specific frequency channel is a frequency channel included in a frequency band requiring dynamic frequency selection (DFS).

6. A method of communicating performed by a wireless local area network (LAN) device that wirelessly communicates using a specific frequency channel shared by a radar and a wireless LAN system, the method comprising:

wirelessly communicating in accordance with a multiple input multiple output (MIMO) scheme using a plurality of transceiver circuits respectively provided for each of a plurality of antennas; and

executing radar wave monitoring on a frequency channel different from a frequency channel in use for wireless communication using one of the plurality of transceiver circuits when the frequency channel in use for the wireless communication is the specific frequency channel.

7. The method according to claim 6 , further comprising:

switching the frequency channel in use to a frequency channel in which a radar wave is not detected by the radar wave monitoring when a radar wave is detected in the frequency channel in use.

8. The method according to claim 6 , wherein

when the frequency channel in use is the specific frequency channel, the radar wave monitoring is executed using the one of the plurality of transceiver circuits and the wireless communication in accordance with the MIMO scheme is executed using the remaining transceiver circuits simultaneously.

9. The method according to claim 6 , further comprising:

wirelessly communicating in accordance with the MIMO scheme using all of the plurality of transceiver circuits when the frequency channel in use is not the specific frequency channel.

10. The method according to claim 6 , wherein

the specific frequency channel is a frequency channel included in a frequency band requiring dynamic frequency selection (DFS).

11. A non-transitory computer-readable medium including computer program instructions, when executed by a wireless local area network (LAN) device that wirelessly communicates using a specific frequency channel shared by a radar and a wireless LAN system, causes the wireless LAN device to perform a communication process comprising:

wirelessly communicating in accordance with a multiple input multiple output (MIMO) scheme using a plurality of transceiver circuits respectively provided for each of a plurality of antennas; and

executing radar wave monitoring on a frequency channel different from a frequency channel in use for wireless communication using one of the plurality of transceiver circuits when the frequency channel in use for the wireless communication is the specific frequency channel.

12. The non-transitory computer-readable medium according to claim 11 , the process further comprising:

switching the frequency channel in use to a frequency channel in which a radar wave is not detected by the radar wave monitoring when a radar wave is detected in the frequency channel in use.

13. The non-transitory computer-readable medium according to claim 11 , wherein

when the frequency channel in use is the specific frequency channel, the radar wave monitoring is executed using the one of the plurality of transceiver circuits and the wireless communication in accordance with the MIMO scheme is executed using the remaining transceiver circuits simultaneously.

14. The non-transitory computer-readable medium according to claim 11 , the process further comprising:

wirelessly communicating in accordance with the MIMO scheme using all of the plurality of transceiver circuits when the frequency channel in use is not the specific frequency channel.

15. The non-transitory computer-readable medium according to claim 11 , wherein

the specific frequency channel is a frequency channel included in a frequency band requiring dynamic frequency selection (DFS).