Wireless communication device and wireless communication method

1. A wireless communication device comprising:

communication circuitry configured to receive a beacon frame transmitted periodically via a first channel, and receive a first frame via the first channel, the first frame including first information for specifying a validity period of an OFDMA (Orthogonal Frequency Division Multiple Access) communication and second information for specifying a second channel, and the second channel being different from the first channel; and

controlling circuitry configured to determine a start timing of the validity period of the OFDMA communication based on the first information in the first frame upon reception of the first frame, and switch an operating channel of the communication circuitry from the first channel to the second channel depending on the start timing, wherein

the controlling circuitry is configured to perform the OFDMA communication using the operating channel switched to the second channel during at least part of the validity period of the OFDMA communication, the first information specifying an end timing of the validity period based on a number of times a beacon frame is transmitted after the first frame is transmitted,

the controlling circuitry is configured to detect the end timing of the validity period of the OFDMA communication based on whether a number of beacon frames received after the first frame is received matches the number of times indicated by the first information and switch the operating channel of the communication circuitry from the second channel to the first channel in accordance with the end timing of the validity period.

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

the first information includes a start time of the validity period and a length of the validity period, and

the controlling circuitry is configured to determine the start timing based on the start time.

3. The wireless communication device according to claim 2 , wherein

the controlling circuitry is configured to switch the operating channel of the communication circuitry from the first channel to the second channel by the start time.

4. The wireless communication device according to claim 2 , wherein the start time is a time later than a time added by set up time required to switch the operating channel of the communication circuitry from the first channel to the second channel to a received time of the first frame.

5. The wireless communication device according to claim 1 , wherein the second information includes information for specifying a first resource unit of a plurality of resource units included in the second channel, each of the resource units including one or more subcarriers among a plurality of subcarriers configured in the second channel,

the controlling circuitry is configured to perform the OFDMA communication using the operating channel switched to the first resource unit during the at least part of the validity period of the OFDMA communication, and

the controlling circuitry is configured to switch the operating channel of the communication circuitry from the first resource unit to the first channel depending on the end timing of the validity period of the OFDMA communication.

6. The wireless communication device according to claim 1 , wherein the controlling circuitry is configured to keep the first channel active even when the operating channel is switched to the second channel.

7. The wireless communication device according to claim 1 , wherein the controlling circuitry is configured to receive a trigger frame for the OFDMA communication and check whether information specifying the wireless communication device as a target terminal for the OFDMA communication is included in the trigger frame for the OFDMA communication and switch the operating channel of the communication circuitry from the first channel to the second channel.

8. The wireless communication device according to claim 1 , wherein the first frame is a management frame or a beacon frame.

9. The wireless communication device according to claim 1 , further comprising at least one antenna.

10. The wireless communication method according to claim 1 , wherein the end timing of the validity period is a time at an end of a last beacon frame among the beacon frames that have been transmitted the number of times indicated by the first information.

11. A wireless communication device comprising:

a transmitter configured to transmit a beacon frame periodically via a first channel and transmit, via the first channel, a first frame including first information for specifying a validity period of an OFDMA (Orthogonal Frequency Division Multiple Access) communication and second information for specifying at least one second channel, the second channel being different from the first channel and the first information specifying an end timing of the validity period based on a number of times a beacon frame is transmitted after the first frame is transmitted; and

controlling circuitry configured to switch an operating channel of the transmitter from the first channel to the second channel by a start timing of the OFDMA communication specified based on the first information after the first frame is transmitted and perform the OFDMA communication via the second channel specified in the second information during at least part of the validity period of the OFDMA communication,

wherein the controlling circuitry is configured to detect an end timing of the validity period of the OFDMA communication based on whether a number of beacon frames transmitted after the first frame is transmitted matches the number of times indicated by the first information, and switch the operating channel of the communication circuitry from the second channel to the first channel in accordance with the end timing.

12. The wireless communication device according to claim 11 , wherein the second channel includes a plurality of resource units,

the controlling circuitry switches the operating channel of the transmitter from the first channel to the plurality of resource units,

the controlling circuitry performs the OFDMA communication via the plurality of resource units,

each of the plurality of resource units includes one or more subcarriers, and

the controlling circuitry switches the operating channel of the communication circuitry from the plurality of resource units to the first channel based the end timing of the OFDMA communication.

13. The wireless communication device according to claim 11 , further comprising at least one antenna.

14. A wireless communication method performed by a wireless communication device, comprising:

receiving a beacon frame transmitted periodically via a first channel;

receiving a first frame via the first channel, the first frame including first information for specifying a validity period of an OFDMA (Orthogonal Frequency Division Multiple Access) communication and second information for specifying a second channel, the second channel being different from the first channel, and the first information specifying an end timing of the validity period based on a number of times a beacon frame is transmitted after the first frame is transmitted;

determining a start timing of the validity period of the OFDMA communication based on the first information in the first frame upon reception of the first frame;

switching an operating channel from the first channel to the second channel depending on the start timing;

performing the OFDMA communication using the operating channel switched to the second channel during at least part of the validity period of the OFDMA communication;

detecting an end timing of the validity period of the OFDMA communication based on whether a number of beacon frames received after the first frame is received matches the number of times indicated by the first information; and

switching the operating channel of the communication circuitry from the second channel to the first channel in accordance with the end timing of the validity period.

15. The wireless communication method according to claim 14 , wherein

the first information includes a start time of the validity period and a length of the validity period, and

the start timing is determined based on the start time.

16. The wireless communication method according to claim 15 , further comprising: switching the operating channel of the communication circuitry from the first channel to the second channel by the start time.

17. The wireless communication method according to claim 15 , wherein the start time is a time later than a time added by set up time required to switch the operating channel from the first channel to the second channel to a received time of the first frame.

18. The wireless communication method according to claim 14 , wherein the second information includes information for specifying a first resource unit of a plurality of resource units included in the second channel, each of the resource units including one or more subcarriers among a plurality of subcarriers configured in the second channel,

the method includes performing the OFDMA communication using the operating channel switched to the first resource unit during the at least part of the validity period of the OFDMA communication, and

the method includes switching the operating channel from the first resource unit to the first channel depending on the end timing of the validity period of the OFDMA communication.

19. The wireless communication method according to claim 14 , further comprising: keeping the first channel active even when the operating channel is switched to the second channel.

20. The wireless communication method according to claim 14 , further comprising: receiving a trigger frame for the OFDMA communication and checking whether information specifying the wireless communication device as a target terminal for the OFDMA communication is included in the trigger frame for the OFDMA communication and switching the operating channel from the first channel to the second channel.

21. The wireless communication method according to claim 14 , wherein the first frame is a management frame or a beacon frame.