# US 2020/0404589 A1 · Methods and apparatuses for channel access and recovery wake-up radios

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- Number: US 2020/0404589 A1
- Document ID: US20200404589A1
- Status: Published application
- Kind: A1
- Application number: 16/977,606
- Filed: 2019-03-04
- Published: 2020-12-24
- 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/US20200404589A1

## 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 wireless transmit/receive unit (WTRU), the method comprising:
receiving, from a first access point (AP) associated with the WTRU, via a primary connectivity radio (PCR) transceiver, a management frame that includes a wake-up radio (WUR) discovery element, wherein the WUR discovery element comprises a first channel to be used by the first AP and a second channel to be used by a second AP;
activating a wake-up radio (WUR) transceiver and deactivating the PCR transceiver;
receiving, from the first AP, via the WUR transceiver, a first WUR frame in a WUR physical layer protocol data unit (WUR PPDU) format over the first channel; and
receiving, from the second AP, via the WUR transceiver, a second WUR frame in a WUR PPDU format over the second channel.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
transmitting, to the first AP, via the PCR transceiver, a request frame indicating that on a condition that the WTRU is disassociated from the first AP, the WTRU will enter a WUR only discovery mode to monitor for a WUR frame based on the one or more WUR discovery elements.

### Claim 3 (depends on 2)

The method of claim 2, wherein the WTRU enters the WUR only discovery mode after the WUR transceiver is activated and the PCR transceiver is deactivated.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

The method of claim 1, wherein the first WUR frame or the second 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, wherein the WUR discovery element in the management frame includes at least one of a first operating class of the first AP, a first WUR discovery channel of the first AP, a first WUR channel of the first AP, first WUR parameters of the first AP, a second operating class of the second AP, a second WUR discovery channel of the second AP, a second WUR channel of the second AP, or second WUR parameters of the second AP.

### Claim 7 (depends on 5)

The method of claim 5, further comprising:
on a condition that the first WUR frame is a first WUR discovery frame, monitoring the first WUR discovery frame over the first WUR discovery channel; and
on a condition that the second WUR frame is a second WUR discovery frame, monitoring the second WUR discovery frame over the second WUR discovery channel.

### Claim 8 (depends on 5)

The method of claim 5, further comprising:
on a condition that the first WUR frame is a first WUR beacon frame, a first WUR wake-up frame, or a first WUR vendor specific frame, monitoring the first WUR beacon frame, the first WUR wake-up frame, or the first WUR vendor specific frame over the first WUR channel; and
on a condition that the second WUR frame is a second WUR beacon frame, a second WUR wake-up frame, or a second WUR vendor specific frame, monitoring the second WUR beacon frame, the second WUR wake-up frame, or the second WUR vendor specific frame over the second WUR channel.

### Claim 9

A wireless transmit/receive unit (WTRU) comprising:
a PCR transceiver configured to receive, from a first access point (AP) associated with the WTRU, a management frame that includes a wake-up radio (WUR) discovery element, wherein the WUR discovery element comprises a first channel to be used by the first AP and a second channel to be used by a second AP;
a processor configured to activate a WUR transceiver and deactivate the PCR transceiver; and
the WUR transceiver configured to:
receive, from the first AP, a first WUR frame in a WUR physical layer protocol data unit (WUR PPDU) format over the first channel; and
receive, from the second AP, a second WUR frame in a WUR physical layer protocol data unit (WUR PPDU) format over the second channel.

### Claim 10 (depends on 9)

The WTRU of claim 9, wherein the PCR transceiver is further configured to transmit, to the first AP, a request frame indicating that on a condition that the WTRU is disassociated from the first AP, the WTRU will enter a WUR only discovery mode to monitor for a WUR frame based on the one or more WUR discovery elements.

### Claim 11 (depends on 10)

The WTRU of claim 10, wherein the WTRU enters the WUR only discovery mode after the WUR transceiver is activated and the PCR transceiver is deactivated.

### Claim 12 (depends on 9)

The WTRU of claim 9, wherein the management frame is a beacon frame or a probe response frame.

### Claim 13 (depends on 9)

The WTRU of claim 9, wherein the first WUR frame or the second WUR frame is a WUR discovery frame, a WUR beacon frame, a WUR wake-up frame, or a WUR vendor specific frame.

### Claim 14 (depends on 13)

The WTRU of claim 13, wherein the one or more WUR discovery element in the management frame includes at least one of a first operating class of the first AP, a first WUR discovery channel of the first AP, a first WUR channel of the first AP, first WUR parameters of the first AP, a second operating class of the second AP, a second WUR discovery channel of the second AP, a second WUR channel of the second AP, or second WUR parameters of the second AP.

### Claim 15 (depends on 13)

The WTRU of claim 13, wherein the WUR transceiver is further configured to:
on a condition that the first WUR frame is a first WUR discovery frame, monitor the first WUR discovery frame over the first WUR discovery channel; and
on a condition that the second WUR frame is a second WUR discovery frame, monitoring the second WUR discovery frame over the second WUR discovery channel.

### Claim 16 (depends on 13)

The method of claim 13, wherein the WUR transceiver is further configured to:
on a condition that the first WUR frame is a first WUR beacon frame, a first WUR wake-up frame or a first WUR vendor specific frame, monitor the first WUR beacon frame, the first WUR wake-up frame or the first WUR vendor specific frame over the first WUR channel; and
on a condition that the second WUR frame is a second WUR beacon frame, a second WUR wake-up frame, or a second WUR vendor specific frame, monitoring the second WUR beacon frame, the second WUR wake-up frame, or the second WUR vendor specific frame over the second WUR channel.

### Claim 17 (depends on 1)

The method of claim 1, further comprising:
activating the PCR to communicate with the AP selected from among the first AP and the second AP.

### Claim 18 (depends on 9)

The WTRU of claim 9, wherein the processor is further configured to activate the PCR to communicate with the AP selected from among the first AP and the second AP.

### Claim 19 (depends on 1)

The method of claim 1, further comprising:
selecting, based on signal strengths of the first WUR frame and the second WUR frame, an AP from among the first AP and the second AP.

### Claim 20 (depends on 9)

The WTRU of claim 9, wherein the processor is further configured to select, based on signal strengths of the first WUR frame and the second WUR frame, an AP from among the first AP and the second AP.