Apparatus and method for wireless communication

1. A wireless communication apparatus capable of controlling communication on at least a first frequency channel and a second frequency channel, comprising:

a baseband processor to generate a beacon frame, the beacon frame, via the first frequency channel, notifying of an identifier of the second frequency channel, frequency band information on the second frequency channel, and a group identifier which is used on the second frequency channel, a group of the group identifier being a system component configured by the wireless communication apparatus and that controls to transmit and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the baseband processor controls to:

receive, via the first frequency channel, a connection request frame in which a first address is specified as the source address;

receive, via the first frequency channel, a change request frame to change to the second frequency channel in which the first address is specified as the source address, after permitting a connection request by the connection request frame, and

conduct, via the second frequency channel, sending of a frame in which the first address is specified as the destination address and receiving of a frame in which the first address is specified as the source address, after permitting a change request by the change request frame.

2. The apparatus according to claim 1 , wherein the baseband processor further makes a notification of a communication system which is used on the second frequency channel.

3. The apparatus according to claim 2 , wherein the communication system includes a plurality of modulation and coding schemes, and wherein the baseband processor controls to conduct, via the second frequency channel, sending of the frame in which the first address is specified as the destination address and receiving of the frame in which the first address is specified as the source address, using one of the modulation and coding schemes if the change request by the change request frame is permitted.

4. The apparatus according to claim 1 , wherein the baseband processor makes, via the second frequency channel, a notification of an identifier of the first frequency channel, frequency band information on the first frequency channel, and a group identifier of a group to which the wireless communication apparatus belongs on the first frequency channel.

5. The apparatus according to claim 1 , wherein the baseband processor controls to send, via the first frequency channel, a first response frame by which the change request to change to the second frequency channel is permitted,

controls to receive, via the second frequency channel, a change completion notification frame by which a notification of completion of a change to the second frequency channel is made, wherein the first address is specified as the source address, and

controls to send, via the second frequency channel, a second response frame.

6. The apparatus according to claim 1 , further comprising a connection management table which retains a communication system along with the first address, wherein the communication system is notified by a frame in which the first address is specified as the source address, and the baseband processor refers to the connection management table to determine the communication system to be used for sending the frame in which the first address is specified as the destination address and receiving the frame in which the first address is specified as the source address.

7. A wireless communication apparatus capable of controlling communication on at least a first frequency channel and a second frequency channel and selecting at least one of the first and second frequency channels, comprising:

a baseband processor that controls to receive, via the first frequency channel, information on a third frequency channel, the information including frequency band information on the third frequency channel and a group identifier which is used on the third frequency channel and controls

to send and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and wherein the baseband processor controls to:

send, via the first frequency channel, a connection request frame in which a first address is specified as the destination address;

receive a permission with respect to the connection request frame;

send a change request frame to change to the second frequency channel in which the first address is specified as the destination address, if the third frequency channel corresponds to the second frequency channel; and

conduct communication on the second frequency channel using the information on the third frequency channel, after a permission with respect to the change request frame is received.

8. The apparatus according to claim 7 , wherein the connection request frame includes information on communication systems which can be used on the first frequency channel and the second frequency channel, and wherein the baseband processor controls to:

conduct communication on the first frequency channel, using one of the communication systems which can be used on the first frequency channel, and

if the permission with respect to the change request frame to change to the second frequency channel is received, conduct the communication on the second frequency channel, using one of the communication systems which can be used on the second frequency channel.

9. The apparatus according to claim 8 , wherein the communication systems include a plurality of modulation and coding schemes and the baseband processor

controls to conduct, via the first frequency channel, the communication using one of the modulation and coding schemes which can be used on the first frequency channel, and

if the permission with respect to the change request frame to change to the second frequency channel is received, controls to conduct, via the second frequency channel, the communication using one of the modulation and coding schemes which can be used on the second frequency channel.

10. A wireless communication apparatus capable of controlling communication on at least a first frequency channel and a second frequency channel, comprising:

a baseband processor to generate a beacon frame, the beacon frame, via the first frequency channel, notifying of a channel bandwidth and a center frequency of the second frequency channel, and that controls to transmit and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the baseband processor controls to:

receive, via the first frequency channel, a connection request frame in which a first address is specified as the source address;

receive, via the first frequency channel, a change request frame to change to the second frequency channel in which the first address is specified as the source address, after permitting a connection request by the connection request frame,

send, via the first frequency channel, an acknowledgement frame in which the first address is specified as the destination address, and

conduct, via the second frequency channel, sending of a frame in which the first address is specified as the destination address and receiving of a frame in which the first address is specified as the source address.

11. The apparatus according to claim 10 , wherein the baseband processor further makes a notification of a communication system which is used on the second frequency channel.

12. The apparatus according to claim 11 , wherein the communication system includes a plurality of modulation and coding schemes, and the baseband processor controls to conduct, via the second frequency channel, sending of the frame in which the first address is specified as the destination address and receiving of the frame in which the first address is specified as the source address, using one of the modulation and coding schemes if a change request by the change request frame is permitted.

13. The apparatus according to claim 10 , wherein the connection request frame and the change request frame are unicast management frames.

14. The apparatus according to claim 10 , wherein the acknowledgement frame is a control frame.

15. The apparatus according to claim 10 , wherein the first frequency channel and the second frequency channel partly overlap each other on frequencies.

16. The apparatus according to claim 10 , further comprising a connection management table which retains a communication system along with the first address, wherein the communication system is notified by a frame in which the first address is specified as the source address, and the baseband processor refers to the connection management table to determine the communication system to be used for sending the frame in which the first address is specified as the destination address and receiving the frame in which the first address is specified as the source address.

17. A wireless communication apparatus capable of controlling communication on at least a first frequency channel and a second frequency channel and selecting at least one of the first and second frequency channels, comprising:

a baseband processor that controls to receive, via the first frequency channel, information on a third frequency channel, the information including a channel bandwidth and a center frequency of the third frequency channel, and

controls to send and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the baseband processor controls to:

send, via the first frequency channel, a connection request frame in which a first address is specified as the destination address;

receive a permission with respect to the connection request frame;

send a change request frame to change to the second frequency channel in which the first address is specified as the destination address, if the third frequency channel corresponds to the second frequency channel; and

conduct communication on the second frequency channel using the information on the third frequency channel, after a permission with respect to the change request frame is received.

18. The apparatus according to claim 17 , wherein the connection request frame includes information on communication systems which can be used on the first frequency channel and the second frequency channel, and the baseband processor controls to:

conduct communication on the first frequency channel, using one of the communication systems which can be used on the first frequency channel, and

if the permission with respect to the change request frame to change to the second frequency channel is received, controls to conduct the communication on the second frequency channel, using one of the communication systems which can be used on the second frequency channel.

19. The apparatus according to claim 18 , wherein the communication systems include a plurality of modulation and coding schemes and the baseband processor

controls to conduct, via the first frequency channel, the communication using one of the modulation and coding schemes which can be used on the first frequency channel, and

if the permission with respect to the change request frame to change to the second frequency channel is received, controls to conduct, via the second frequency channel, the communication using one of the modulation and coding schemes which can be used on the second frequency channel.

20. The apparatus according to claim 17 , wherein the connection request frame is an association request frame.

21. The apparatus according to claim 1 , further comprising a first antenna capable of conducting communication on the first frequency channel and a second antenna capable of conducting communication on the second frequency channel, wherein the baseband processor controls to send and receive the frames using the first antenna and the second antenna.

22. The apparatus according to claim 1 , further comprising an antenna capable of conducting communication on the first frequency channel and the second frequency channel, wherein the baseband processor controls to send and receive the frames using the antenna.

23. A wireless communication method capable of controlling communication on at least a first frequency channel and a second frequency channel, comprising:

generating a beacon frame, via the first frequency channel, the beacon frame notifying of an identifier of the second frequency channel, frequency band information on the second frequency channel, and a group identifier which is used on the second frequency channel, a group of the group identifier being a system component; and

controlling to transmit and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the method further comprises:

controlling to receive, via the first frequency channel, a connection request frame in which a first address is specified as the source address;

controlling to receive, via the first frequency channel, a change request frame to change to the second frequency channel in which the first address is specified as the source address, after permitting a connection request by the connection request frame, and

controlling to conduct, via the second frequency channel, sending of a frame in which the first address is specified as the destination address and receiving of a frame in which the first address is specified as the source address, after permitting a change request by the change request frame.

24. A wireless communication method capable of controlling communication on at least a first frequency channel and a second frequency channel and selecting at least one of the first and second frequency channels, comprising:

controlling to receive, via the first frequency channel, information on a third frequency channel, the information including frequency band information on the third frequency channel and a group identifier which is used on the third frequency channel; and

controlling to send and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the method further comprises:

controlling to send, via the first frequency channel, a connection request frame in which a first address is specified as the destination address;

controlling to receive a permission with respect to the connection request frame;

controlling to send a change request frame to change to the second frequency channel in which the first address is specified as the destination address, if the third frequency channel corresponds to the second frequency channel; and

controlling to conduct communication on the second frequency channel using the information on the third frequency channel, after a permission with respect to the change request frame is received.

25. A wireless communication method capable of controlling communication on at least a first frequency channel and a second frequency channel, comprising:

generating a beacon frame, via the first frequency channel, the beacon frame notifying a notification of a channel bandwidth and a center frequency of the second frequency channel; and

controlling to transmit and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the method further comprises:

controlling to receive, via the first frequency channel, a connection request frame in which a first address is specified as the source address;

controlling to receive, via the first frequency channel, a change request frame to change to the second frequency channel in which the first address is specified as the source address, after permitting a connection request by the connection request frame,

controlling to send, via the first frequency channel, an acknowledgement frame in which the first address is specified as the destination address, and

controlling to conduct, via the second frequency channel, sending of a frame in which the first address is specified as the destination address and receiving of a frame in which the first address is specified as the source address.

26. A wireless communication method capable of controlling communication on at least a first frequency channel and a second frequency channel and selecting at least one of the first and second frequency channels, comprising:

controlling to receive, via the first frequency channel, information on a third frequency channel, the information including a channel bandwidth and a center frequency of the third frequency channel,

controlling to send and receive frames on the first frequency channel and the second frequency channel,

wherein each of the frames includes a source address and a destination address, and the method further comprises:

controlling to send, via the first frequency channel, a connection request frame in which a first address is specified as the destination address;

controlling to receive a permission with respect to the connection request frame;

controlling to send a change request frame to change to the second frequency channel in which the first address is specified as the destination address, if the third frequency channel corresponds to the second frequency channel; and

controlling to conduct communication on the second frequency channel using the information on the third frequency channel, after a permission with respect to the change request frame is received.

27. The apparatus according to claim 7 , further comprising a first antenna capable of conducting communication on the first frequency channel and a second antenna capable of conducting communication on the second frequency channel, wherein the baseband processor controls to send and receive the frames using the first antenna and the second antenna.

28. The apparatus according to claim 10 , further comprising a first antenna capable of conducting communication on the first frequency channel and a second antenna capable of conducting communication on the second frequency channel, wherein the baseband processor controls to send and receive the frames using the first antenna and the second antenna.

29. The apparatus according to claim 17 , further comprising a first antenna capable of conducting communication on the first frequency channel and a second antenna capable of conducting communication on the second frequency channel, wherein the baseband processor controls to send and receive the frames using the first antenna and the second antenna.

30. The apparatus according to claim 7 , further comprising an antenna capable of conducting communication on the first frequency channel and the second frequency channel, wherein the baseband processor controls to send and receive the frames using the antenna.

31. The apparatus according to claim 10 , further comprising an antenna capable of conducting communication on the first frequency channel and the second frequency channel, wherein the baseband processor controls to send and receive the frames using the antenna.

32. The apparatus according to claim 17 , further comprising an antenna capable of conducting communication on the first frequency channel and the second frequency channel, wherein the baseband processor controls to send and receive the frames using the antenna.

33. The apparatus according to claim 1 , wherein the group of the group identifier is a Basic Service Set.

34. The apparatus according to claim 7 , wherein the third frequency channel corresponds to the second frequency channel.

35. The apparatus according to claim 17 , wherein the third frequency channel corresponds to the second frequency channel.