# US 12,192,154 B2 · Channel access schemes for wireless local area network (WLAN) with full-duplex radios

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- Number: US 12,192,154 B2
- Document ID: US12192154B2
- Status: Granted
- Kind: B2
- Application number: 18/545,998
- Filed: 2023-12-19
- Published: 2024-04-11
- Granted: 2025-01-07
- Earliest claimed: 2018-05-03
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: Interdigital Patent Holdings, Inc.
- Inventors: Oghenekome Oteri; Hanqing Lou; Li Hsiang Sun; Alphan Sahin; Robert L. Olesen; Xiaofei Wang; Rui Yang
- Web page: https://patentgrep.com/patent/US12192154B2

## CPC

- H04L 5/14: Two-way operation using the same type of signal, i.e. duplex
- H04W 72/12: Wireless traffic scheduling
- H04W 74/0816: with collision avoidance
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods and apparatuses are described herein for multiple access schemes for Wireless Local Area Network (WLAN) with full-duplex radios. For example, an access point (AP), in response to receiving a request to send (RTS) from a first station (STA), may transmit a full-duplex clear to send (FD CTS) to the first STA and a full-duplex request to send (FD RTS) to a second STA. In response to transmitting the FD RTS to the second STA, the AP may receive a clear to send (CTS) from the second STA. The AP may transmit, to both the first STA and the second STA, a FD trigger frame that includes scheduling information to enables FD communication with the first STA for uplink (UL) data and the second STA for downlink (DL) data at a same time. The scheduling information may include timing information and channel information for the FD communication.

## Claims

### Claim 1

A method for use in a station (STA), the method comprising:
transmitting, to an access point (AP), a request to send (RTS) frame indicating that the STA has data to send with full-duplex (FD) capability; and
receiving, from the AP, a full-duplex clear to send (FD CTS) frame including an FD preamble, wherein the FD preamble includes training information for FD filter estimation that enables FD communication between the AP and the STA.

### Claim 2 (depends on 1)

The method of claim 1, further comprising receiving, from the AP, an FD trigger frame that includes scheduling information for uplink transmission of the data from the STA, and wherein the scheduling information included in the FD trigger frame includes timing information and channel information for the FD communication, wherein the FD trigger frame is aggregated with a legacy preamble, an FD preamble, and data.

### Claim 3 (depends on 1)

The method of claim 1, further comprising receiving, from the AP, an FD trigger frame that includes scheduling information for uplink transmission of the data from the STA, and transmitting, to the AP, based on the scheduling information, the data for the FD communication with the AP.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
appending, on a condition that a first packet size of the data is less than a second packet size of another data for downlink transmission from the AP, padding information to the data to the AP to equalize the first packet size of the data to the second packet size of the another data.

### Claim 5

A station (STA) comprising:
a transmitter configured to transmit, to an access point (AP), a request to send (RTS) frame indicating that the STA has data to send with full-duplex (FD) capability; and
a receiver configured to:
receive, from the AP, a full-duplex clear to send (FD CTS) frame including an FD preamble, wherein the FD preamble includes training information for FD filter estimation that enables FD communication between the AP and the STA.

### Claim 6 (depends on 5)

The STA of claim 5, further comprising wherein the receiver is configured to receive, from the AP, an FD trigger frame that includes scheduling information for uplink transmission of the data from the STA; and
wherein the scheduling information included in the FD trigger frame includes timing information and channel information for the FD communication, wherein the FD trigger frame is aggregated with a legacy preamble, an FD preamble, and data.

### Claim 7 (depends on 5)

The STA of claim 5, further comprising wherein the receiver is configured to receive, from the AP, an FD trigger frame that includes scheduling information for uplink transmission of the data from the STA; and
wherein the transmitter is further configured to transmit, to the AP, based on the scheduling information, the data for the FD communication with the AP.

### Claim 8 (depends on 5)

The STA of claim 5, further comprising: a processor configured to append, on a condition that a first packet size of the data is less than a second packet size of another data for downlink transmission from the AP, padding information to the data to the AP to equalize the first packet size of the data to the second packet size of the another data.