Wireless communication method for uplink multiple-user transmission schedule and wireless communication terminal using the method

Abstract

The present invention relates to a wireless communication method for uplink multi-user transmission scheduling and a wireless communication terminal using the same. To this end, provided are a base wireless communication terminal comprising a processor and a transceiver, wherein the processor transmits a trigger frame soliciting an uplink multi-user transmission, determines whether the uplink multi-user transmission is successful based on received uplink multi-user data in response to the trigger frame, and retransmits the trigger frame when it is determined that the uplink multi-user transmission has failed and a wireless communication method using the same.

1 . A base wireless communication terminal comprising a processor and a transceiver, wherein the processor is configured to:
 transmit a trigger frame soliciting an uplink multi-user transmission,   determine whether the uplink multi-user transmission is successful based on received uplink multi-user data in response to the trigger frame, and   retransmit the trigger frame when it is determined that the uplink multi-user transmission has failed.   
     
     
         2 . The base wireless communication terminal of  claim 1 , wherein the processor is further configured to:
 determine that the uplink multi-user transmission is successful when uplink data is received from at least one of wireless communication terminals indicated by the trigger frame.   
     
     
         3 . The base wireless communication terminal of  claim 1 , wherein the processor is further configured to:
 determine that the uplink multi-user transmission has failed when no uplink data in response to the trigger frame has been received.   
     
     
         4 . The base wireless communication terminal of  claim 3 , wherein the processor is further configured to:
 when it is determined that the uplink multi-user transmission has failed, obtain a new backoff counter for retransmitting the trigger frame, and perform a backoff procedure based on the obtained new backoff counter.   
     
     
         5 . The base wireless communication terminal of  claim 3 , wherein the processor is further configured to:
 retransmit the trigger frame when the channel is idle for a predetermined period of time after the trigger frame has been transmitted.   
     
     
         6 . The base wireless communication terminal of  claim 5 , wherein the predetermined period of time is set based on a time for receiving a preamble of an uplink multi-user PLCP protocol data unit (PPPU). 
     
     
         7 . The base wireless communication terminal of  claim 5 , wherein the predetermined period of time is set to be a PCF IFS (PIFS). 
     
     
         8 . The base wireless communication terminal of  claim 1 , wherein the processor is further configured to:
 perform the retransmission of the trigger frame until an uplink multi-user transmission based on the retransmission is successful within a predetermined count limit of retransmission or a predetermined time limit of retransmission.   
     
     
         9 . The base wireless communication terminal of  claim 8 , wherein the time limit of retransmission is set based on an initial transmission opportunity (TXOP) set in the trigger frame. 
     
     
         10 . The base wireless communication terminal of  claim 8 , wherein the processor is further configured to:
 attempt to transmit a new trigger frame based on new scheduling information when all the uplink multi-user transmissions based on the retransmission within the count limit of retransmission or the time limit of retransmission have failed.   
     
     
         11 . A wireless communication method of a base wireless communication terminal, the method comprising:
 transmitting a trigger frame soliciting an uplink multi-user transmission;   determining whether the uplink multi-user transmission is successful based on received uplink multi-user data in response to the trigger frame; and   retransmitting the trigger frame when it is determined that the uplink multi-user transmission has failed.   
     
     
         12 . A base wireless communication terminal comprising a processor and a transceiver, wherein the processor is configured to:
 transmit a first trigger frame soliciting an uplink multi-user transmission, wherein the trigger frame includes resource unit allocation information for wireless communication terminals to perform uplink multi-user transmission,   receive uplink multi-user data in response to the transmitted trigger frame,   generate new scheduling information for wireless communication terminals that have failed to transmit the uplink multi-user data, and   transmit a second trigger frame based on the generated new scheduling information.   
     
     
         13 . The base wireless communication terminal of  claim 12 , wherein the processor is further configured to:
 when uplink data is not received from a wireless communication terminal to which a first resource unit is allocated through the first trigger frame, allocate a second resource unit to the corresponding wireless communication terminal through the second trigger frame.   
     
     
         14 . The base wireless communication terminal of  claim 12 , wherein the first trigger frame and the second trigger frame are different trigger frames transmitted within a predetermined period for consecutive uplink multi-user transmissions. 
     
     
         15 . The base wireless communication terminal of  claim 12 , wherein the processor is further configured to:
 receive a buffer status report from at least one wireless communication terminal, and   transmit the trigger frame based on the received buffer status report,   wherein the buffer status report is transmitted based on a probability value according to an access category of data to be transmitted by the wireless communication terminal.   
     
     
         16 . The base wireless communication terminal of  claim 15 , wherein the higher a priority of an access category of data to be transmitted is, the higher a transmission probability of the buffer status report is. 
     
     
         17 . A wireless communication method of a base wireless communication terminal, the method comprising:
 transmitting a first trigger frame soliciting an uplink multi-user transmission, wherein the trigger frame includes resource unit allocation information for wireless communication terminals to perform uplink multi-user transmission;   receiving uplink multi-user data in response to the transmitted trigger frame;   generating new scheduling information for wireless communication terminals that have failed to transmit the uplink multi-user data; and   transmitting a second trigger frame based on the generated new scheduling information.