Systems and methods for collision resolution in a wifi OFDMA system

Patent metadata

Field	Value
Publication number	US-12531673-B2
Application number	US-202017608789-A
Country	US
Kind code	B2
Filing date	May 4, 2020
Priority date	May 10, 2019
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

Methods and system may be used for collision detection for orthogonal frequency division multiple access (OFDMA)-based random access. A wireless transmit/receive unit (WTRU) may receive, from an access point (AP), a first trigger frame triggering random access using OFDMA. The WTRU may transmit, to the AP, in response to the first trigger frame a trigger-based frame including user specific control information in a signal (SIG) field. The WTRU may receive an acknowledgment/negative acknowledgment (ACK/NAK) message indicating that the trigger-based frame was successfully detected at the AP or that the trigger-based frame was not successfully detected at the AP. The WTRU receive, from the AP, a scheduling retransmission frame including rescheduling information for STAs with corrupted UL transmissions. On a condition that the scheduling retransmission frame indicates that a collision of the trigger-based frame was detected, the WTRU may retransmit the trigger-based frame.

First claim

What is claimed is:

1 . A station (STA) comprising:
a receiver configured to receive, from an access point (AP), a trigger frame triggering random access using orthogonal frequency division multiple access (OFDMA), wherein the trigger frame includes a request for the STA to use a signal (SIG) field with user specific control information; a transmitter configured to transmit, to the AP, in response to the trigger frame a trigger-based frame including user specific control information in a signal (SIG) field, wherein the SIG field is transmitted using a partial resource unit (RU), and wherein the user specific control information includes a STA identifier (ID) and a traffic type; and the receiver configured to receive a negative acknowledgment (NAK) message indicating that the trigger-based frame was not successfully detected at the AP.

2 . The STA of claim 1 , wherein the trigger-based frame is a trigger-based Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (TB-PPDU).

3 . The STA of claim 1 , wherein the SIG field is a SIG-B field.

4 . The STA of claim 1 , wherein the user specific control information further includes at least one of traffic load information, traffic latency information, or traffic quality of service (QoS) information.

5 . The STA of claim 1 , wherein the transmitter is configured to transmit the trigger-based frame as part of an uplink (UL) multi-user (MU) transmission.

6 . The STA of claim 1 , wherein the transmitter is configured to transmit the SIG field using a narrowband portion of a bandwidth, and to transmit at least one field of the trigger-based frame, other than the SIG field, using the entire bandwidth.

7 . The STA of claim 1 , wherein:
the receiver is further configured to receive, from the AP, a scheduling retransmission frame including rescheduling information for at least one STA with a collided UL transmission and an indication that a collision of the trigger-based frame was detected; and the transmitter is further configured to retransmit the trigger-based frame.

8 . The STA of claim 1 , configured as a non-AP station (STA).

9 . A method performed by a station (STA), the method comprising:
receiving, from an access point (AP), a trigger frame triggering random access using orthogonal frequency division multiple access (OFDMA), wherein the trigger frame includes a request for the STA to use a signal (SIG) field with user specific control information; transmitting, to the AP, in response to the trigger frame a trigger-based frame including user specific control information in a signal (SIG) field, wherein the SIG field is transmitted using a partial resource unit (RU), and wherein the user specific control information includes a STA identifier (ID) and a traffic type; and receiving a negative acknowledgment (NAK) message indicating that the trigger-based frame was not successfully detected at the AP.

10 . The method of claim 9 , wherein the trigger-based frame is a trigger-based Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (TB-PPDU).

11 . The method of claim 9 , wherein the SIG field is a SIG-B field.

12 . The method of claim 9 , wherein the user specific control information further includes at least one of traffic load information, traffic latency information, or traffic quality of service (QoS) information.

13 . The method of claim 9 , wherein the trigger-based frame is transmitted as part of an uplink (UL) multi-user (MU) transmission.

14 . The method of claim 9 , wherein the SIG field is transmitted using a narrowband portion of a bandwidth, and at least one field of the trigger-based frame, other than the SIG field, is transmitted using the entire bandwidth.

15 . The method of claim 9 , further comprising:
receiving, from the AP, a scheduling retransmission frame including rescheduling information for at least one STA with a collided UL transmission and an indication that a collision of the trigger-based frame was detected; and retransmitting the trigger-based frame.

16 . The method of claim 9 wherein the STA is configured as a non-AP station (STA).

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Lou Hanqing
• Sahin Alphan
• Sun Li-Hsiang
• Wang Xiaofei
• Yang Rui
• La Sita Frank

Classifications

• H04L1/1893 Primary

  Physical mapping arrangements (physical resource mapping in general H04L5/00) · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L1/1896

  ARQ related signaling · CPC title