Wireless communication method and wireless communication terminal for spatial reuse of overlapped basic service set
The present invention relates to a wireless communication method and a wireless communication terminal for a spatial reuse operation of an overlapping basic service set, and more particularly, to a wireless communication method and a wireless communication terminal for supporting a spatial reuse operation of an overlapping basic service set to efficiently use a wireless resource. To this end, provided are a wireless communication terminal including: a processor; and a communication unit, wherein the processor receives a trigger frame indicating an uplink multi-user transmission, and transmits a trigger-based PHY protocol data unit (PPDU) in response to the received trigger frame, wherein the trigger-based PPDU comprises a spatial reuse parameter for spatial reuse operation of an overlapping basic service set (OBSS) terminal and a wireless communication method using the same.
1. A wireless communication terminal, the terminal comprising: a processor; and a communication unit, wherein the processor is configured to: receive a trigger frame indicating an uplink multi-user transmission, and transmit a trigger-based PHY protocol data unit (PPDU) in response to the received trigger frame, wherein the trigger-based PPDU comprises a spatial reuse parameter for spatial reuse operation of an overlapping basic service set (OBSS) terminal; wherein a total bandwidth on which transmission of trigger-based PPDU(s) in response to the trigger frame is performed is indicated by a bandwidth field of a high efficiency signal field A (HE-SIG-A) of the trigger based-PPDU, and wherein when the total bandwidth consists of a first frequency band and a second frequency band which are non-contiguous with each other, a spatial reuse parameter for the first frequency band and a spatial reuse parameter for the second frequency band are set to the same value.
2. The wireless communication terminal of claim 1 , wherein the HE-SIG-A of the trigger-based PPDU contains a plurality of spatial reuse fields, and the plurality of spatial reuse fields carry spatial reuse parameters obtained from the trigger frame, and wherein each of the plurality of spatial reuse fields indicates a spatial reuse parameter for an individual subband constituting the total bandwidth.
3. The wireless communication terminal of claim 2 ,
wherein the plurality of spatial reuse fields comprise a first spatial reuse field, a second spatial reuse field, a third spatial reuse field, and a fourth spatial reuse field, and
wherein when the total bandwidth consists of the first frequency band and the second frequency band which are non-contiguous with each other, the first spatial reuse field and the second spatial reuse field for the first frequency band are respectively set to the same value as the third spatial reuse field and the fourth spatial reuse field for the second frequency band.
4. The wireless communication terminal of claim 2 ,
wherein when the total bandwidth is less than or equal to a predetermined bandwidth, each of the plurality of spatial reuse fields indicates a spatial reuse parameter for a subband of a first frequency bandwidth, and
wherein when the total bandwidth exceeds the predetermined bandwidth, each of the plurality of spatial reuse fields indicates a spatial reuse parameter for a subband of a second frequency bandwidth which is wider than the first frequency bandwidth.
5. The wireless communication terminal of claim 1 ,
wherein the spatial reuse parameter is set based on a transmission power of a PPDU containing the trigger frame and an acceptable interference level of a base wireless communication terminal that transmitted the PPDU containing the trigger frame.
6. The wireless communication terminal of claim 1 ,
wherein the spatial reuse operation is performed based on a received signal strength of a PPDU containing the trigger frame measured by the OBSS terminal and the spatial reuse parameter obtained by the OBSS terminal.
7. The wireless communication terminal of claim 6 ,
wherein the spatial reuse operation comprises an operation of adjusting a transmission power of the OBSS terminal based on the spatial reuse parameter, and
wherein the transmission power of the OBSS terminal is set to be lower than a value obtained by subtracting the received signal strength from a value of the spatial reuse parameter.
8. The wireless communication terminal of claim 6 ,
wherein the spatial reuse operation comprises allowing a transmission of the OBSS terminal only when an intended transmission power of the OBSS terminal is lower than a value obtained by subtracting the received signal strength from a value of the spatial reuse parameter.
9. The wireless communication terminal of claim 1 ,
wherein the OBSS terminal obtains the spatial reuse parameter from at least one of the trigger frame and the trigger-based PPDU.
10. A wireless communication method of a wireless communication terminal, the method comprising: receiving a trigger frame indicating an uplink multi-user transmission; and transmitting a trigger-based PHY protocol data unit (PPDU) in response to the received trigger frame; wherein the trigger-based PPDU comprises a spatial reuse parameter for spatial reuse operation of an overlapping basic service set (OBSS) terminal; wherein a total bandwidth on which transmission of trigger-based PPDU(s) in response to the trigger frame is performed is indicated by a bandwidth field of a high efficiency signal field A (HE-SIG-A) of the trigger based-PPDU, and wherein when the total bandwidth consists of a first frequency band and a second frequency band which are non-contiguous with each other, a spatial reuse parameter for the first frequency band and a spatial reuse parameter for the second frequency band are set to the same value.
11. The wireless communication method of claim 10 , Wherein the HE-SIG-A of the trigger-based PPDU contains a plurality of spatial reuse fields, and the plurality of spatial reuse fields carry spatial reuse parameters obtained from the trigger frame, and wherein each of the plurality of spatial reuse fields indicates a spatial reuse parameter for an individual subband constituting the total bandwidth.
12. The wireless communication method of claim 11 ,
wherein the plurality of spatial reuse fields comprise a first spatial reuse field, a second spatial reuse field, a third spatial reuse field, and a fourth spatial reuse field, and
wherein when the total bandwidth consists of the first frequency band and the second frequency band which are non-contiguous with each other, the first spatial reuse field and the second spatial reuse field for the first frequency band are respectively set to the same value as the third spatial reuse field and the fourth spatial reuse field for the second frequency band.
13. The wireless communication method of claim 11 ,
wherein when the total bandwidth is less than or equal to a predetermined bandwidth, each of the plurality of spatial reuse fields indicates a spatial reuse parameter for a subband of a first frequency bandwidth, and
wherein when the total bandwidth exceeds the predetermined bandwidth, each of the plurality of spatial reuse fields indicates a spatial reuse parameter for a subband of a second frequency bandwidth which is wider than the first frequency bandwidth.
14. The wireless communication method of claim 10 ,
wherein the spatial reuse parameter is set based on a transmission power of a PPDU containing the trigger frame and an acceptable interference level of a base wireless communication terminal that transmitted the PPDU containing the trigger frame.
15. The wireless communication method of claim 10 ,
wherein the spatial reuse operation is performed based on a received signal strength of a PPDU containing the trigger frame measured by the OBSS terminal and the spatial reuse parameter obtained by the OBSS terminal.
16. The wireless communication method of claim 15 ,
wherein the spatial reuse operation comprises an operation of adjusting a transmission power of the OBSS terminal based on the spatial reuse parameter, and
wherein the transmission power of the OBSS terminal is set to be lower than a value obtained by subtracting the received signal strength from a value of the spatial reuse parameter.
17. The wireless communication method of claim 10 ,
wherein the OBSS terminal obtains the spatial reuse parameter from at least one of the trigger frame and the trigger-based PPDU.
18. The wireless communication method of claim 15 ,
wherein the spatial reuse operation comprises allowing a transmission of the OBSS terminal only when an intended transmission power of the OBSS terminal is lower than a value obtained by subtracting the received signal strength from a value of the spatial reuse parameter.