IP Library › Granted Patent US 12,278,723
Granted Patent B2
US 12,278,723 · App. 18/648,338 · Granted Apr 15, 2025

Channel access method for data transmission, and wireless communication method and wireless communication terminal using same

Inventors: Juhyung Son (Gyeonggi-do, KR); Jinsam Kwak (Gyeonggi-do, KR); Geonjung Ko (Gyeonggi-do, KR)
Assignees: WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.; SK TELECOM CO., LTD.
H04L27/2613H04L5/0055H04L5/0094H04W24/08H04W72/0446H04W74/004H04W74/0808H04W74/0833H04W80/02H04W80/08H04L27/26134H04W84/12
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Quick Facts
Patent No.
US 12,278,723
App. No.
18/648,338
Granted
Apr 15, 2025
Kind
B2
Abstract

The present invention relates to a channel access method for data transmission, and a wireless communication method and a wireless communication terminal using the same, and more particularly, to a wireless communication method and a wireless communication terminal for efficiently scheduling data transmissions of a plurality of terminals. To this end, provided are a wireless communication terminal comprising a processor and a transceiver, wherein the processor receives a trigger frame indicating an uplink multi-user transmission, and transmits an uplink multi-user PLCP protocol data unit (PPDU) in response to the received trigger frame, wherein the trigger frame and a non-legacy preamble of the uplink multi-user PPDU contains remaining transmission opportunity (TXOP) time information of a current TXOP and a wireless communication method using the same.

Claims (41)

1. A wireless communication terminal comprising:

a transceiver configured to transmit and receive wireless signals; and

a processor configured to process wireless signals transmitted or received through the transceiver,

wherein the processor is configured to:

receive, from an access point (AP), a trigger frame soliciting an uplink transmission from one or more terminals,

transmit a first physical layer protocol data unit (PPDU) in response to the trigger frame, and

receive an aggregate-medium access control (MAC) protocol data unit (A-MPDU) including an acknowledgement (Ack) frame in response to the first PPDU,

wherein the Ack frame is combined with a next trigger frame indicating transmission of a next PPDU and included in the A-MPDU when a process related to transmission of the next PPDU can be performed within a current transmission opportunity (TXOP),

wherein the trigger frame includes a duration field related to a TXOP duration, and

wherein the duration field is related to a specific value indicating a first time required for transmission of the first PPDU added to a second time required for the A-MPDU containing the Ack frame.

2. The wireless communication terminal of claim 1 ,

wherein the TXOP duration includes a duration until transmission of the Ack frame is completed.

3. The wireless communication terminal of claim 1 ,

wherein a PPDU includes non-legacy preamble including a High Efficiency Signal A (HE-SIG-A) field when the trigger frame is included in the PPDU,

wherein the HE-SIG-A field includes a TXOP subfield composed of a plurality of bits to indicate the TXOP duration in time units, and

wherein a value of the TXOP subfield is a multiple value of a basic unit to represent a sum of the first time and the second time.

4. The wireless communication terminal of claim 3 ,

wherein a number of bits in the duration field is greater than a number of bits in the TXOP subfield.

5. The wireless communication terminal of claim 1 ,

wherein the Ack frame is located before the next trigger frame within the A-MPDU.

6. The wireless communication terminal of claim 1 ,

wherein the Ack frame includes a multi-STA block Ack with a variable length within a maximum length of the block response.

7. A wireless communication method of a wireless communication terminal comprising:

receiving, from an access point (AP), a trigger frame soliciting an uplink transmission from one or more terminals;

transmitting a first physical layer protocol data unit (PPDU) in response to the trigger frame; and

receive an aggregate-medium access control (MAC) protocol data unit (A-MPDU) including an acknowledgement (Ack) frame in response to the first PPDU,

wherein the Ack frame is combined with a next trigger frame indicating transmission a next PPDU and included in the A-MPDU when a process related to transmission of the next PPDU can be performed within a current transmission opportunity (TXOP),

wherein the trigger frame includes a duration field related to a TXOP duration, and

wherein the duration field is related to a specific value indicating a first time required for transmission of the first PPDU added to a second time required for the A-MPDU containing the Ack frame.

8. The wireless communication method of claim 7 ,

wherein the TXOP duration includes a duration until transmission of the Ack frame is completed.

9. The wireless communication method of claim 7 ,

wherein a PPDU includes non-legacy preamble including a High Efficiency Signal A (HE-SIG-A) field when the trigger frame is included in the PPDU,

wherein the HE-SIG-A field includes a TXOP subfield composed of a plurality of bits to indicate the TXOP duration in time units, and

wherein a value of the TXOP subfield is a multiple value of a basic unit to represent a sum of the first time and the second time.

10. The wireless communication method of claim 9 ,

wherein a number of bits in the duration field is greater than a number of bits in the TXOP subfield.

11. The wireless communication method of claim 7 ,

wherein the Ack frame is located before the next trigger frame within the A-MPDU.

12. The wireless communication method of claim 7 ,

wherein the Ack frame includes a multi-STA block Ack with a variable length within a maximum length of the block response.

Priority Claims (3)
KR 10-2015-0092531 · Jun 29, 2015 · national
KR 10-2015-0098711 · Jul 10, 2015 · national
KR 10-2015-0100686 · Jul 15, 2015 · national
Continuity (3)
Continuation 17895929 · Aug 25, 2022
Continuation 15739162
Related Publication 20240275655A1 · Aug 15, 2024
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