Wireless communication terminal and wireless communication method for multiuser EDCA operation
The present invention relates to a wireless communication terminal and a wireless communication method for a multi-user EDCA operation, and more particularly, to a wireless communication terminal and a wireless communication method for performing a combination of a legacy EDCA operation and a multi-user EDCA operation. To this end, provided are a wireless communication terminal including: a communication unit; and a processor configured to control transmission and reception of a wireless signal through the communication unit, wherein the processor updates enhanced distributed channel access (EDCA) parameters for channel access, the EDCA parameters being updated based on an EDCA parameter set selected from a first EDCA parameter set and a second EDCA parameter set, and performs channel access based on the updated EDCA parameters and a wireless communication method using the same.
1. A wireless communication terminal, the terminal comprising:
a communication unit; and
a processor configured to control transmission and reception of a wireless signal through the communication unit,
wherein the processor is configured to:
update enhanced distributed channel access (EDCA) parameters for channel access; according to an EDCA parameter set selected from a first EDCA parameter set and a second EDCA parameter set,
perform channel access based on the updated EDCA parameters,
wherein the second EDCA parameter set is a multi-user (MU) EDCA parameter set, and
wherein an MU EDCA timer indicating a duration of performing channel access is set using the EDCA parameters updated based on the MU EDCA parameter set, when the EDCA parameters are updated based on the MU EDCA parameter set, and
transmit a frame containing an operating mode indication (OMI) information including a first subfield indicating whether the terminal participates in UL MU (uplink multi-user) operation,
wherein a value of the MU EDCA timer is set to ‘0’ when an immediate acknowledgment for the frame containing the OM information is received from an OM responder.
2. The wireless communication terminal of claim 1 ,
wherein when the immediate acknowledgment for the frame containing the OMI information is received from the OMI responder, the processor is allowed to set MU EDCA timers of all access categories to zero.
3. The wireless communication terminal of claim 1 ,
wherein when the MU EDCA timer reaches zero, the processor updates the EDCA parameters based on the first EDCA parameter set most recently received from a base wireless communication terminal to which the terminal is associated.
4. The wireless communication terminal of claim 1 ,
wherein when the MU EDCA timer reaches zero, the processor updates the EDCA parameters based on a predetermined default EDCA parameter set if the first EDCA parameter set has not been received from a base wireless communication terminal to which the terminal is associated.
5. The wireless communication terminal of claim 1 ,
wherein the MU EDCA timer is set to a value of an MU EDCA timer subfield of the MU EDCA parameter set most recently received from a base wireless communication terminal to which the terminal is associated.
6. The wireless communication terminal of claim 1 ,
wherein at least one parameter of the second EDCA parameter set has a value greater than a corresponding parameter of the first EDCA parameter set.
7. The wireless communication terminal of claim 1 ,
wherein the channel access is performed based on a backoff procedure using a backoff timer obtained within a contention window of a corresponding access category, and
wherein the EDCA parameters include a contention window minimum value and a contention window maximum value for setting the contention window.
8. The wireless communication terminal of claim 1 ,
wherein the first EDCA parameter set and the second EDCA parameter set are received via at least one of a beacon, a probe response, and an association response transmitted by a base wireless communication terminal to which the terminal is associated.
9. The wireless communication terminal of claim 1 ,
wherein the frame further includes a second subfield indicating whether a data transmission operation for the UL MU is performed, and
wherein the EDCA parameters is updated based on the first subfield and the second subfield.
10. A wireless communication method of a wireless communication terminal, the method comprising:
updating enhanced distributed channel access (EDCA) parameters for channel access according to an EDCA parameter set selected from a first EDCA parameter set and a second EDCA parameter set;
performing channel access based on the updated EDCA parameters,
wherein the second EDCA parameter set is a multi-user (MU) EDCA parameter set, and
wherein an MU EDCA timer indicating a duration of performing channel access is set using the EDCA parameters updated based on the MU EDCA parameter set, when the EDCA parameters are updated based on the MU EDCA parameter set; and
transmitting a frame containing an operating mode indication (OMI) information including a first subfield indicating whether the terminal participates in UL MU (uplink multi-user) operation;
wherein a value of the MU EDCA timer is set to ‘0’ when an immediate acknowledgment for the frame containing the OMI information is received from an OMI responder.
11. The wireless communication method of claim 10 ,
wherein when the immediate acknowledgment for the frame containing the OMI information is received from the OMI responder, the setting the MU EDCA timer to zero comprises setting MU EDCA timers of all access categories to zero.
12. The wireless communication method of claim 10 ,
wherein when the MU EDCA timer reaches zero, the updating step comprises updating the EDCA parameters based on the first EDCA parameter set most recently received from a base wireless communication terminal to which the terminal is associated.
13. The wireless communication method of claim 10 ,
wherein when the MU EDCA timer reaches zero, the updating step comprises updating the EDCA parameters based on a predetermined default EDCA parameter set if the first EDCA parameter set has not been received from a base wireless communication terminal to which the terminal is associated.
14. The wireless communication method of claim 10 ,
wherein the MU EDCA timer is set to a value of an MU EDCA timer subfield of the MU EDCA parameter set most recently received from a base wireless communication terminal to which the terminal is associated.
15. The wireless communication method of claim 10 ,
wherein at least one parameter of the second EDCA parameter set has a value greater than a corresponding parameter of the first EDCA parameter set.
16. The wireless communication method of claim 10 ,
wherein the channel access is performed based on a backoff procedure using a backoff timer obtained within a contention window of a corresponding access category, and
wherein the EDCA parameters include a contention window minimum value and a contention window maximum value for setting the contention window.
17. The wireless communication method of claim 10 ,
wherein the first EDCA parameter set and the second EDCA parameter set are received via at least one of a beacon, a probe response, and an association response transmitted by a base wireless communication terminal to which the terminal is associated.