Transmitting trigger frame in wireless local area network and wireless terminal using the same

A method in a wireless local area network (WLAN) system, the method comprising:

• receiving, by a receiving wireless terminal, a trigger frame for an orthogonal frequency division multiple access (OFDMA)-based random access from a transmitting wireless terminal, wherein the trigger frame includes resource allocation information, identifier information, and traffic identifier (TID) aggregation limit information,
• wherein a type of the trigger frame is set to a basic type,
• wherein the resource allocation information includes information related to a resource unit (RU) used for the OFDMA-based random access,
• wherein the identifier information is set to an association identifier (AID) of the receiving wireless terminal or one pre-defined value based on whether the RU is used for the OFDMA-based random access,
• wherein the traffic identifier (TID) aggregation limit information includes information related to a maximum number of TIDs allowed for an aggregate medium access control protocol data unit (A-MPDU) to be included in a trigger-based frame, and
• wherein the TID aggregation limit information is set based on whether the RU is used for the OFDMA-based random access, and the TID aggregation limit information is set to ‘0’ or ‘1’ for the RU being used for the OFDMA-based random access;
• configuring, by the receiving wireless terminal, the trigger-based frame based on the TID aggregation limit information;
• and
• transmitting, by the receiving wireless terminal, the trigger-based frame to the transmitting wireless terminal.

A receiving wireless terminal in a wireless local area network (WLAN) system, comprising:

• a transceiver configured for receiving and transmitting wireless signals;
• and
• a processor coupled to the transceiver,
• wherein the processor is configured to:
• receive a trigger frame for an orthogonal frequency division multiple access (OFDMA)-based random access from a transmitting wireless terminal, wherein the trigger frame includes resource allocation information, identifier information, and traffic identifier (TID) aggregation limit information,
• wherein a type of the trigger frame is set to a basic type,
• wherein the resource allocation information includes information related to a resource unit (RU) used for the OFDMA-based random access,
• wherein the identifier information is set to an association identifier (AID) of the receiving wireless terminal or one pre-defined value based on whether the RU is used for the OFDMA-based random access,
• wherein the traffic identifier (TID) aggregation limit information includes information related to a maximum number of TIDs allowed for an aggregate medium access control protocol data unit (A-MPDU) to be included in a trigger-based frame, and
• wherein the TID aggregation limit information is set based on whether the RU is used for the OFDMA-based random access, and the TID aggregation limit information is set to ‘0’ or ‘1’ for the RU being used for the OFDMA-based random access;
• configure the trigger-based frame based on the TID aggregation limit information;
• and
• transmit the trigger-based frame to the transmitting wireless terminal.