# US 12,004,084 B2 · Methods and apparatuses for channel access and recovery wake-up radios

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- Number: US 12,004,084 B2
- Document ID: US12004084B2
- Status: Granted
- Kind: B2
- Application number: 17/868,047
- Filed: 2022-07-19
- Published: 2022-11-03
- Granted: 2024-06-04
- Earliest claimed: 2018-03-02
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: Interdigital Patent Holdings, Inc.
- Inventors: Xiaofei Wang; Li-Hsiang Sun; Hanqing Lou; Oghenekome Oteri; Joseph S. Levy; Rui Yang; Alphan Sahin
- Web page: https://patentgrep.com/patent/US12004084B2

## CPC

- H04W 52/0235: {where the received signal is a power saving command}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Methods and apparatuses are described herein for network discovery. A wireless transmit/receive unit (WTRU) may transmit, to a first access point (AP), via a Primary Connectivity Radio (PCR), a request indicating that on a condition that the WTRU is disassociated from the first AP, the WTRU will enter a wake-up radio (WUR) only discovery mode. The WTRU may receive, from the first AP, via the PCR, a management frame that has WUR discovery elements including an indication of at least one channel used by a second AP. The WTRU may perform disassociation from the first AP. The WTRU may activate a WUR and deactivate the PCR. On a condition that the WTRU is disassociated from the first AP, the WTRU may receive, from the second AP, via the WUR, a WUR frame over the at least one channel to enable the WTRU to activate the PCR to initiate association.

## Claims

### Claim 1

A method for use in a station (STA), the method comprising:
receiving, from an access point (AP), a frame that includes a wake-up radio (WUR) discovery element indicating a plurality of WUR discovery channels, wherein the plurality of WUR discovery channels includes a WUR discovery channel of the AP that the STA is associated with and another WUR discovery channel of another AP that the STA is not associated with; and
receiving, using at least one of the plurality of WUR discovery channels, at least one WUR frame of a plurality of WUR frames, wherein the at least one WUR frame is in a WUR physical layer protocol data unit (WUR PPDU) format.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
transmitting, to the AP, a request frame indicating that on a condition that the STA is disassociated from the AP, the STA will enter a WUR only discovery mode to monitor for the plurality of WUR frames.

### Claim 3 (depends on 2)

The method of claim 2, wherein the STA enters the WUR only discovery mode after a wake-up radio (WUR) transceiver is activated.

### Claim 4 (depends on 1)

The method of claim 1, wherein the frame is a beacon frame or a probe response frame.

### Claim 5 (depends on 1)

The method of claim 1, wherein the at least one WUR frame is a WUR discovery frame, a WUR beacon frame, a WUR wake-up frame, or a WUR vendor specific frame.

### Claim 6 (depends on 5)

The method of claim 5, further comprising:
on a condition that the at least one WUR frame is a WUR discovery frame, monitoring the WUR discovery frame over the WUR discovery channel or the another WUR discovery channel.

### Claim 7 (depends on 1)

The method of claim 1, wherein the WUR discovery element in the frame includes a WUR operating class of the AP, the WUR discovery channel of the AP, one or more WUR parameters of the AP, a WUR operating class of the another AP, the another WUR discovery channel of the another AP, and one or more WUR parameters of the another AP.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
selecting, based on signal strengths of the plurality of WUR frames, the AP or the another AP for further communication with.

### Claim 9 (depends on 1)

The method of claim 1, where the another AP is a neighboring AP.

### Claim 10

A station (STA) comprising:
a processor; and
at least one transceiver,
the processor and the at least one transceiver configured to:
receive, from an access point (AP), a frame that includes a wake-up radio (WUR) discovery element indicating a plurality of WUR discovery channels, wherein the plurality of WUR discovery channels includes a WUR discovery channel of the AP that the STA is associated with and another WUR discovery channel of another AP that the STA is not associated with; and
receive, using at least one of the plurality of WUR discovery channels, at least one WUR frame of a plurality of WUR frames, wherein the at least one WUR frame is in a WUR physical layer protocol data unit (WUR PPDU) format.

### Claim 11 (depends on 10)

The STA of claim 10, wherein the processor and the at least one transceiver are configured to transmit, to the AP, a request frame indicating that on a condition that the STA is disassociated from the AP, the STA will enter a WUR only discovery mode to monitor for the plurality of WUR frames.

### Claim 12 (depends on 11)

The STA of claim 11, wherein the processor and the at least one transceiver are configured to enter the WUR only discovery mode after a wake-up radio (WUR) transceiver is activated.

### Claim 13 (depends on 10)

The STA of claim 10, wherein the frame is a beacon frame or a probe response frame.

### Claim 14 (depends on 10)

The STA of claim 10, wherein the at least one WUR frame is a WUR discovery frame, a WUR beacon frame, a WUR wake-up frame, or a WUR vendor specific frame.

### Claim 15 (depends on 14)

The STA of claim 14, wherein the processor and the at least one transceiver are configured to, on a condition that the at least one WUR frame is a WUR discovery frame, monitor the WUR discovery frame over the WUR discovery channel or the another WUR discovery channel.

### Claim 16 (depends on 10)

The STA of claim 10, wherein the WUR discovery element in the frame includes a WUR operating class of the AP, the WUR discovery channel of the AP, one or more WUR parameters of the AP, a WUR operating class of the another AP, the another WUR discovery channel of the another AP, and one or more WUR parameters of the another AP.

### Claim 17 (depends on 10)

The STA of claim 10, wherein the processor and the at least one transceiver are configured to select, based on signal strengths of the plurality of WUR frames, the AP or the another AP for further communication with.

### Claim 18 (depends on 10)

The STA of claim 10, where the another AP is a neighboring AP.