Wireless communication apparatus and wireless communication method

1. A wireless communication apparatus serving as an access point (AP) of a first wireless local area network (WLAN), the wireless communication apparatus comprising:

a transceiver; and

control circuitry configured to

receive, from a station (STA) in the first WLAN, a first channel notification signal including information regarding a channel used in an Overlap Basic Service Set (OBSS) of a second WLAN different from the first WLAN;

determine, from a predetermined list of possible channels, a frequency band of a channel of a Basic Service Set (BSS) to be used in the first WLAN based on the information regarding the channel used in the OBSS in the second WLAN;

generate a second channel notification signal including information regarding the determined frequency band of the BSS to be used;

transmit the second channel notification signal to the STA in the first WLAN;

receive a response to the second channel notification signal from the STA in the first WLAN; and

communicate with other devices of the first WLAN in accordance with the BSS, wherein

the first channel notification signal includes:

a first announce type indicating that the information regarding the channel used in the OBSS was received by the STA from a STA in the second WLAN, or

a second announce type, different from the first announce type, indicating that the information regarding the channel used in the OBSS was received by the STA from an AP in the second WLAN,

the second channel notification signal includes a third announce type, different from the first and second announce types, indicating that the second channel notification signal is related to channel usage in the first WLAN,

the response from the STA in the first WLAN includes a fourth announce type, different from the first, second and third announce types, indicating that the STA in the first WLAN has assigned one or more frequencies according to the BSS,

the information regarding the channel used in the OBSS comprises:

first information regarding a primary channel used in the OBSS, and

second information regarding at least one secondary channel used in the OBSS,

the determined frequency band comprises:

a frequency band of a primary channel of the BSS that is farthest, in terms of frequency, from a frequency band of the primary channel used in the OBSS, and

a frequency band of at least one secondary channel of the BSS.

2. The wireless communication apparatus according to claim 1 , wherein the control circuitry dynamically changes the determined frequency band based on updates to the information regarding the channel used in the OBSS.

3. The wireless communication apparatus according to claim 1 , wherein

the at least one secondary channel of the BSS comprises a plurality of secondary channels of the BSS, and

the control circuitry:

determines priorities for use of the plurality of secondary channels of the BSS based on the information regarding the channel used in the OBSS, and

includes information about the determined priorities in the information regarding the determined frequency band of the BSS to be used.

4. A wireless communication method to be performed by an access point (AP) of a first wireless local area network (WLAN), the wireless communication method comprising:

receiving, from a station (STA) in the first WLAN, a first channel notification signal including information regarding a channel used in an Overlap Basic Service Set (OBSS) of a second WLAN different from the first WLAN;

determining, from a predetermined list of possible channels, a frequency band of a channel of a Basic Service Set (BSS) to be used in the first WLAN based on the information regarding the channel used in the OBSS in the second WLAN;

generating a second channel notification signal including information regarding the determined frequency band of the BSS to be used;

transmitting the second channel notification signal to the STA in the first WLAN;

receiving a response to the second channel notification signal from the STA in the first WLAN; and

communicating with other devices of the first WLAN via the BSS, wherein

the first channel notification signal includes:

a first announce type indicating that the information regarding the channel used in the OBSS was received by the STA from a STA in the second WLAN, or

a second announce type, different from the first announce type, indicating that the information regarding the channel used in the OBSS was received by the STA from an AP in the second WLAN,

the second channel notification signal includes a third announce type, different from the first and second announce types, indicating that the second channel notification signal is related to channel usage in the first WLAN,

the response from the STA in the first WLAN includes a fourth announce type, different from the first, second and third announce types, indicating that the STA in the first WLAN has assigned one or more frequencies according to the BSS,

the information regarding the channel used in the OBSS comprises:

first information regarding a primary channel used in the OBSS, and

second information regarding at least one secondary channel used in the OBSS, and

the determined frequency band comprises:

a frequency band of a primary channel of the BSS that is farthest, in terms of frequency, from a frequency band of the primary channel used in the OBSS, and

a frequency band of at least one secondary channel of the BSS.

5. A wireless communication apparatus serving as a station (STA) of a first wireless local area network (WLAN), the wireless communication apparatus comprising:

a transceiver; and

control circuitry configured to:

detect a transmission from a device of a second WLAN different from the first WLAN, the detected transmission corresponding to a channel used in an Overlap Basic Service Set (OBSS) of the second WLAN;

generate a first channel notification signal including information regarding the channel used in the OBSS of the second WLAN;

transmit the first channel notification signal to an access point (AP) of the first WLAN;

receive a second channel notification signal from the AP of the first WLAN, the second channel notification signal including information regarding a frequency band of a channel of a Basic Service Set (BSS) to be used in the first WLAN, the frequency band of the channel of the BSS determined by the AP based on the information regarding the channel used in the OBSS in the second WLAN;

transmit a response to the second channel notification signal to the AP in the first WLAN; and

communicate with other devices of the first WLAN in accordance with the BSS, wherein

the first channel notification signal includes:

a first announce type indicating that the information regarding the channel used in the OBSS was received by the STA from a STA in the second WLAN, or

a second announce type, different from the first announce type, indicating that the information regarding the channel used in the OBSS was received by the STA from an AP in the second WLAN,

the second channel notification signal includes a third announce type, different from the first and second announce types, indicating that the second channel notification signal is related to channel usage in the first WLAN,

the response includes a fourth announce type, different from the first, second and third announce types, indicating that the STA in the first WLAN has assigned one or more frequencies according to the BSS,

the information regarding the channel used in the OBSS comprises:

first information regarding a primary channel used in the OBSS, and

second information regarding at least one secondary channel used in the OBSS, and

the determined frequency band comprises:

a frequency band of a primary channel of the BSS that is farthest, in terms of frequency, from a frequency band of the primary channel used in the OBSS, and

a frequency band of at least one secondary channel of the BSS.

6. The wireless communication apparatus according to claim 5 , wherein the control circuitry is further configured to:

determine whether or not to forward the information regarding the frequency band of the channel of the BSS to be used in the first WLAN to a device of the second WLAN;

upon determining to forward the information regarding the frequency band of the channel of the BSS to be used in the first WLAN to a device of the second WLAN, transmit a third channel notification signal to the device of the second WLAN,

wherein the third channel notification signal includes:

the information regarding the frequency band of the channel of the BSS to be used in the first WLAN, and

a fifth announce type different from the first, second, third and fourth announce types, indicating that the third channel notification signal relates to channel usage of a WLAN other than the second WLAN.

7. The wireless communication apparatus according to claim 6 , wherein

the at least one secondary channel of the BSS comprises a plurality of secondary channels of the BSS, and

the information regarding the determined frequency band of the BSS to be used includes information regarding the determined priorities.

8. A wireless communication method to be performed by a station (STA) of a first wireless local area network (WLAN), the wireless communication method comprising:

detecting a transmission from a device of a second WLAN different from the first WLAN, the detected transmission corresponding to a channel used in an Overlap Basic Service Set (OBSS) of the second WLAN;

generating a first channel notification signal including information regarding the channel used in the OBSS of the second WLAN;

transmitting the first channel notification signal to an access point (AP) of the first WLAN;

receiving a second channel notification signal from the AP of the first WLAN, the second channel notification signal including information regarding a frequency band of a channel of a Basic Service Set (BSS) to be used in the first WLAN, the frequency band of the channel of the BSS determined by the AP based on the information regarding the channel used in the OBSS in the second WLAN;

transmitting a response to the second channel notification signal to the AP in the first WLAN; and

communicating with other devices of the first WLAN in accordance with the BSS, wherein

the first channel notification signal includes:

a first announce type indicating that the information regarding the channel used in the OBSS was received by the STA from a STA in the second WLAN, or

a second announce type, different from the first announce type, indicating that the information regarding the channel used in the OBSS was received by the STA from an AP in the second WLAN,

the second channel notification signal includes a third announce type, different from the first and second announce types, indicating that the second channel notification signal is related to channel usage in the first WLAN,

the response includes a fourth announce type, different from the first, second and third announce types, indicating that the STA in the first WLAN has assigned one or more frequencies according to the BSS,

the information regarding the channel used in the OBSS comprises:

first information regarding a primary channel used in the OBSS, and

second information regarding at least one secondary channel used in the OBSS, and

the determined frequency band comprises:

a frequency band of a primary channel of the BSS that is farthest, in terms of frequency, from a frequency band of the primary channel used in the OBSS, and

a frequency band of at least one secondary channel of the BSS.