Wireless communication system and wireless communication method

1. A wireless communication system in which a plurality of adjacent basic service sets (BSSs) made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame), and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the control part is configured to perform carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

wherein the control part is configured, when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header;

to perform carrier sense with a different CCA threshold for the Non-HE format;

to continue the demodulation of the received frame if the predetermined channel is busy; and

to stop the demodulation of the received frame if the predetermined channel is idle.

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

the control part is configured, when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header;

to check the BSSID included in the received frame;

to continue the demodulation of the received frame if the BSSID is consistent with its own BSS; and

to stop the demodulation of the received frame if the BSSID is not consistent with its own BSS.

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

the control part is configured to perform carrier sense with a CCA threshold for the Non-HE format when the received frame is in the Non-HE format and the BSSID is not consistent with its own BSS.

4. The wireless communication system according to claim 1 , wherein

the control part is configured to check a format of a frame scheduled to be transmitted, and to control the CCA threshold to a value higher than the default value if the format is the HE format, and to not control the CCA threshold or control the CCA threshold so that the frame can be receivable if the format is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header.

5. A wireless communication system in which a plurality of adjacent basic service sets (BSSs) made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame), and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the control part is configured to perform carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

wherein the control part is configured, when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header, to check a type of the received frame and to continue the demodulation if the type is a frame type or a frame subtype necessary for communication control of each the wireless station.

6. A wireless communication system in which a plurality of adjacent basic service sets (BSSs) made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame), and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the control part is configured to perform carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

wherein the control part is configured:

to check a destination station to which a frame is scheduled to be transmitted;

to control the CCA threshold to a value higher than a default value if the destination station and its own station can stop the demodulation of the received frame; and

to not control the CCA threshold or to control the CCA threshold so that the frame can be receivable if the destination station and its own station cannot stop the demodulation of the received frame.

7. A wireless communication system in which a plurality of adjacent basic service sets (BSSs) made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS includes a control part which checks a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame), and continues demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stops the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the control part is configured to perform carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

wherein the control part is configured to check a type of a frame scheduled to be transmitted, and to not control the CCA threshold or control the CCA threshold so that the frame can be receivable if the type is a frame type or a frame subtype necessary for communication control of each wireless station, and to control the CCA threshold to a value higher than the default value if the type is not the frame type or the frame subtype necessary for the communication control of each wireless station.

8. A wireless communication method in which a plurality of adjacent basic service sets (BSSs), made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS has:

a first step checking a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame); and

a second step continuing demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stopping the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the second step further performs carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS

wherein the second step further includes:

performs carrier sense with a different CCA threshold for the Non-HE format when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header;

continues the demodulation of the received frame if the predetermined channel is busy; and

stops the demodulation of the received frame if the predetermined channel is idle.

9. The wireless communication method according to claim 8 , wherein

the second step further:

checks the BSSID included in the received frame when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header;

continues the demodulation of the received frame if the BSSID is consistent with its own BSS; and

stops the demodulation of the received frame if the BSSID is not consistent with its own BSS.

10. The wireless communication method according to claim 9 , wherein

the second step performs carrier sense with a CCA threshold for the Non-HE format when the received frame is in the Non-HE format and the BSSID is not consistent with its own BSS.

11. The wireless communication method according to claim 8 , further comprising

a fourth step:

checking a format of a frame scheduled to be transmitted;

controlling the CCA threshold to a value higher than the default value if the format is the HE format; and

not controlling the CCA threshold or controlling the CCA threshold so that the frame can be receivable if the format is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header.

12. A wireless communication method in which a plurality of adjacent basic service sets (BSSs), made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS has:

a first step checking a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame); and

a second step continuing demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stopping the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the second step further performs carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

wherein

the second step checks a type of the received frame when a format of the received frame is the Non-HE format that does not include a BSSID within the preamble but includes a BSSID in a MAC header, and continues the demodulation if the type is a frame type or a frame subtype necessary for communication control of each of wireless station.

13. A wireless communication method in which a plurality of adjacent basic service sets (BSSs), made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS has:

a first step checking a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame); and

a second step continuing demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stopping the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the second step further performs carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

further comprising a third step:

checking a destination station to which a frame is scheduled to be transmitted;

controlling the CCA threshold to a value higher than the default value if the destination station and its own station can stop the demodulation of the received frame; and

not controlling the CCA threshold or controlling the CCA threshold so that the frame can be receivable if the destination station and its own station cannot stop the demodulation of the received frame.

14. A wireless communication method in which a plurality of adjacent basic service sets (BSSs), made of a plurality of wireless stations, which transmit and receive a frame using a predetermined channel, are present and in which a transmitting station of each BSS performs wireless communication by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold) considering an interference power from an interfering station which uses the predetermined channel, wherein:

a format that includes a BSSID of a transmitting station within a preamble of the frame is an HE format;

a given wireless station in the BSS has:

a first step checking a format of a frame received at a predetermined receiver sensitivity or above (hereinafter referred to as a received frame); and

a second step continuing demodulation of the received frame if the format is HE format and the BSSID in the received frame is consistent with its own BSS, and stopping the demodulation of the received frame if the format is the HE format and the BSSID in the received frame is not consistent with its own BSS; and

the second step further performs carrier sense with a predetermined CCA threshold for the HE format when the received frame is in the HE format and the BSSID of the received frame is not consistent with its own BSS,

further comprising a fifth step:

checking a type of a frame scheduled to be transmitted;

not controlling the CCA threshold or controlling the CCA threshold so that the frame can be receivable if the type is a frame type or a frame subtype necessary for communication control of each wireless station; and

controlling the CCA threshold to a value higher than the default value if the type is not the frame type nor the frame subtype necessary for the communication control of each wireless station.