Channel access method for very high throughput (VHT) wireless local access network system and station supporting the channel access method

Abstract

A method for transmitting data in a wireless communication system, the method includes transmitting, by a first station, a plurality of request to send (RTS) frames to a second station through a plurality of subchannels, each of the plurality of RTS frames being transmitted through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth; receiving, by the first station, at least one clear to send (CTS) frame in response to at least one of the plurality of RTS frames from the second station through at least one idle subchannel of the plurality of subchannels; and transmitting, by the first station, a data frame to the second station after receiving the at least one CTS frame, wherein each of the plurality of RTS frames includes first channel information related to the plurality of subchannels.

What is claimed is: 
     
       1. A method for performed by a destination station operating in a wireless communication system, the method comprising:
 receiving, by a first the destination station, a plurality of request to send (RTS) frames from a second source station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth; 
 determining a plurality of idle subchannels based on the plurality of subchannels;  
 transmitting, by the first destination station to the source station, at least one a plurality of clear to send (CTS) frame frames in response to at least one of the plurality of RTS frames to the second station, through at least one idle subchannel of the plurality of subchannels, each of the at least one CTS frame being transmitted through a corresponding one of the at least one plurality of idle subchannel subchannels; and 
 receiving, by the first destination station, a data frame from the second source station after based on transmitting the at least one plurality of CTS frame frames, 
 wherein each of the at least one plurality of CTS frame includes frames comprises channel information related to indicative of the at least one plurality of idle subchannel through which the at least one CTS frame is transmitted by subchannels as being available for the first source station, and to transmit the data frame is received through the at least one idle subchannel indicated by the channel information, and 
 wherein a number of the at least one plurality of idle subchannel subchannels through which the at least one plurality of CTS frame is frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received. 
 
     
     
       2. The method of  claim 1 , wherein the channel information is indicative of the number of the at least one plurality of idle subchannel is 1, subchannels being equal to 2 or 4 when based on the number of the plurality of subchannels is being equal to 4. 
     
     
       3. The method of  claim 1 , wherein the channel information is indicative of the number of the at least one plurality of idle subchannel is 1 or subchannels being equal to 2 when based on the number of the plurality of subchannels is being equal to 2. 
     
     
       4. A device destination station configured to operate in a wireless communication system, the destination station comprising:
 a transceiver; and 
 aat least one processor; and 
 at least one computer memory operatively connected to the transceiver and configured to at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: 
 instructreceiving, by the destination station via the transceiver to receive, a plurality of request to send (RTS) frames from a source station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth, 
 determining a plurality of idle subchannels based on the plurality of subchannels;  
 instructtransmitting, by the destination station to the source station via the transceiver to transmit at least one, a plurality of clear to send (CTS) frameframes in response to at least one of the plurality of RTS frames to the station, through at least one idle subchannel of the plurality of subchannels, each of the at least one CTS frame being transmitted through a corresponding one of the at least one plurality of idle subchannel subchannels, and 
 instructreceiving, by the destination station via the transceiver to receive, a data frame from the source station afterbased on transmitting the at least oneplurality of CTS frameframes, 
 wherein each of the at least one plurality of CTS frame includes frames comprises channel information related to indicative of the at least one plurality of idle subchannel subchannels through which the at least one plurality of CTS frame is frames are transmitted by the device, and as being available for the source station to transmit the data frameis received through the at least one idle subchannel indicated by the channel information, and 
 wherein a number of the at least one plurality of idle subchannel subchannels through which the at least one plurality of CTS frame is frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received. 
 
     
     
       5. The device destination station of  claim 4 , wherein the channel information is indicative of the number of the at least one plurality of idle subchannel is 1, subchannels being equal to 2 or 4 when based on the number of the plurality of subchannels is being equal to 4. 
     
     
       6. The device destination station of  claim 4 , wherein the channel information is indicative of the number of the at least one plurality of idle subchannel is 1 or subchannels being equal to 2 when based on the number of the plurality of subchannels is being equal to 2. 
     
     
       7. A method for a wireless communication system, the method comprising:
 receiving, by a first station, a plurality of request to send (RTS) frames from a second station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth;   transmitting, by the first station, at least one clear to send (CTS) frame in response to at least one of the plurality of RTS frames to the second station through at least one idle subchannel of the plurality of subchannels, each of the at least one CTS frame being transmitted through a corresponding one of the at least one idle subchannel; and   receiving, by the first station, a data frame from the second station after transmitting the at least one CTS frame,   wherein each of the at least one CTS frame includes channel information related to all of the at least one idle subchannel through which the at least one CTS frame is transmitted by the first station, and the data frame is received through the at least one idle subchannel indicated by the channel information, and   wherein a number of the at least one idle subchannel through which the at least one CTS frame is transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.   
     
     
       8. The method of  claim 7 , wherein the number of the at least one idle subchannel is 1, 2 or 4 when the number of the plurality of subchannels is 4. 
     
     
       9. The method of  claim 7 , wherein the number of the at least one idle subchannel is 1 or 2 when the number of the plurality of subchannels is 2. 
     
     
       10. A device comprising:
 a transceiver; and   a processor operatively connected to the transceiver and configured to:   instruct the transceiver to receive a plurality of request to send (RTS) frames from a station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth,   instruct the transceiver to transmit at least one clear to send (CTS) frame in response to at least one of the plurality of RTS frames to the station through at least one idle subchannel of the plurality of subchannels, each of the at least one CTS frame being transmitted through a corresponding one of the at least one idle subchannel, and   instruct the transceiver to receive a data frame from the station after transmitting the at least one CTS frame,   wherein each of the at least one CTS frame includes channel information related to all of the at least one idle subchannel through which the at least one CTS frame is transmitted by the device, and the data frame is received through the at least one idle subchannel indicated by the channel information, and   wherein a number of the at least one idle subchannel through which the at least one CTS frame is transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.   
     
     
       11. The device of  claim 10 , wherein the number of the at least one idle subchannel is 1, 2 or 4 when the number of the plurality of subchannels is 4. 
     
     
       12. The device of  claim 10 , wherein the number of the at least one idle subchannel is 1 or 2 when the number of the plurality of subchannels is 2. 
     
     
       13. A method for a wireless communication system, the method comprising:
 receiving, by a first station, a plurality of request to send (RTS) frames from a second station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth;   transmitting, by the first station, a plurality of clear to send (CTS) frames in response to at least one of the plurality of RTS frames to the second station through a plurality of idle subchannels of the plurality of subchannels, each of the plurality of CTS frames being transmitted through a corresponding one of the plurality of idle subchannels; and   receiving, by the first station, a data frame from the second station after transmitting the plurality of CTS frames,   wherein each of the plurality of CTS frames includes channel information related to the plurality of idle subchannels through which the plurality of CTS frames are transmitted by the first station, and the data frame is received through the plurality of idle subchannels indicated by the channel information, and   wherein a number of the plurality of idle subchannels through which the plurality of CTS frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.   
     
     
       14. The method of  claim 13 , wherein the number of the plurality of subchannels is 4. 
     
     
       15. A device comprising:
 a transceiver; and   a processor operatively connected to the transceiver and configured to:   instruct the transceiver to receive a plurality of request to send (RTS) frames from a second station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth;   instruct the transceiver to transmit a plurality of clear to send (CTS) frames in response to at least one of the plurality of RTS frames to the second station through a plurality of idle subchannels of the plurality of subchannels, each of the plurality of CTS frames being transmitted through a corresponding one of the plurality of idle subchannels; and   instruct the transceiver to receive a data frame from the second station after transmitting the plurality of CTS frames,   wherein each of the plurality of CTS frames includes channel information related to the plurality of idle subchannels through which the plurality of CTS frames are transmitted by the device, and the data frame is received through the plurality of idle subchannels indicated by the channel information, and   wherein a number of the plurality of idle subchannels through which the plurality of CTS frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.   
     
     
       16. The device of  claim 15 , wherein the number of the plurality of subchannels of 4. 
     
     
       17. The method of claim 1, wherein the destination station is a non-Access Point (non-AP) station and the source station is an AP station. 
     
     
       18. The method of claim 1, wherein the destination station is an AP station and the source station is a non-AP station. 
     
     
       19. The destination station of claim 4, wherein the destination station is a non-Access Point (non-AP) station and the source station is an AP station. 
     
     
       20. The destination station of claim 4, wherein the destination station is an AP station and the source station is a non-AP station. 
     
     
       21. A method performed by a destination station operating in a wireless communication system, the method comprising:
 receiving, by the destination station, a plurality of request to send (RTS) frames from a source station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth;   transmitting, by the destination station, a plurality of clear to send (CTS) frames in response to at least one of the plurality of RTS frames to the source station through a plurality of idle subchannels of the plurality of subchannels, each of the plurality of CTS frames being transmitted through a corresponding one of the plurality of idle subchannels; and   receiving, by the destination station, a data frame from the source station after transmitting the plurality of CTS frames,   wherein each of the plurality of CTS frames includes channel information related to the plurality of idle subchannels through which the plurality of CTS frames are transmitted by the destination station, and the data frame is received through the plurality of idle subchannels indicated by the channel information, and   wherein a number of the plurality of idle subchannels through which the plurality of CTS frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.   
     
     
       22. A device comprising:
 a transceiver; and   a processor operatively connected to the transceiver and configured to perform operations comprising:   receiving, by the device, a plurality of request to send (RTS) frames from a source station through a plurality of subchannels, each of the plurality of RTS frames being received through a corresponding one of the plurality of subchannels, each of the plurality of subchannels having a 20 megahertz (MHz) bandwidth;   transmitting, by the device, a plurality of clear to send (CTS) frames in response to at least one of the plurality of RTS frames to the source station through a plurality of idle subchannels of the plurality of subchannels, each of the plurality of CTS frames being transmitted through a corresponding one of the plurality of idle subchannels; and   receiving, by the device, a data frame from the source station after transmitting the plurality of CTS frames,   wherein each of the plurality of CTS frames includes channel information related to the plurality of idle subchannels through which the plurality of CTS frames are transmitted by the device, and the data frame is received through the plurality of idle subchannels indicated by the channel information, and   wherein a number of the plurality of idle subchannels through which the plurality of CTS frames are transmitted is equal to or less than a number of the plurality of subchannels through which the plurality of RTS frames are received.