Wireless communication method and wireless communication terminal for transmitting information on buffer status

A wireless communication terminal wirelessly communicating with a base wireless communication terminal, the wireless communication terminal comprising:

• a transceiver;
• and
• a processor,
• wherein the processor is configured to receive, by using the transceiver, a wireless signal including a trigger frame from the base wireless communication terminal, wherein the trigger frame triggers an uplink transmission of the wireless communication terminal, and transmit, by using the transceiver, a wireless signal including both data and buffer status information including a queue data size field to the base wireless communication terminal based on the trigger frame, wherein the queue data size field indicates a size of data stored in a transmission buffer using a variable granularity of the size of the data, and
• wherein the buffer status information is included in a quality of service (QOS) control field which signals information on a QoS control of a medium access control (MAC) header, and
• wherein the variable granularity of the size of the data is determined by the wireless communication terminal.

An operation method of a wireless communication terminal wireless communicating with a base wireless communication terminal, the method comprising:

• receiving a wireless signal including a trigger frame from the base wireless communication terminal, wherein the trigger frame triggers an uplink transmission of the wireless communication terminal;
• and
• transmitting a wireless signal including both data and buffer status information including a queue data size field to the base wireless communication terminal based on the trigger frame, wherein the queue data size field indicates a size of data stored in a transmission buffer using a variable granularity of the size of the data, and
• wherein the buffer status information is included in a quality of service (QOS) control field which signals information on a QoS control of a medium access control (MAC) header, and
• wherein the variable granularity of the size of the data is determined by the wireless communication terminal.