# US 2021/0345455 A1 · Device-Capability-Based and Standalone Paging in New Radio Unlicensed Band

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- Number: US 2021/0345455 A1
- Document ID: US20210345455A1
- Status: Published application
- Kind: A1
- Application number: 16/478,951
- Filed: 2018-08-03
- Published: 2021-11-04
- Earliest claimed: 2018-08-03
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Sree Ram Kodali; Sethuraman Gurumoorthy; Murtaza A. Shikari; Haijing Hu; Srinivasan Nimmala; Yuqin Chen; Xu Ou; Longda Xing; Srirang A. Lovlekar; Fangli Xu; Dawei Zhang
- Web page: https://patentgrep.com/patent/US20210345455A1

## CPC

- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 88/184: {Messaging devices, e.g. message centre}
- H04W 52/0241: {where no transmission is received, e.g. out of range of the transmitter}
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- H04W 68/025: {Indirect paging}
- H04W 52/0229: {where the received signal is a wanted signal}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- 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

A device may operate within a specified frequency band within a specified coverage area of a wireless cellular network served by a cell. The device may monitor, during a cell-specific paging window, paging messages transmitted by the cell within the cell-specific paging window to devices operating within the specified coverage area and targeted to receive paging messages. The device may enter an idle state if the monitoring indicates that the paging messages do not include a respective paging message intended for the device. If the monitoring indicates that the paging messages include a paging message intended for the device, the device may process the paging message. Furthermore, the device may indicate to the cell, when attaching to the cell, whether the device has a capability to support standalone operation within the specified frequency band. If the indication is that the device does not support such standalone operation, the cell may not issue paging messages to the device.

## Claims

### Claim 1

An apparatus comprising:
a processing element configured to cause a device to:
operate within a specified frequency band within a specified coverage area of a wireless cellular network served by a cell;
indicate to the cell whether the device has a capability to support standalone operation within the specified frequency band;
monitor, during a cell-specific paging window, paging messages transmitted by the cell within the cell-specific paging window to multiple devices operating within the specified coverage area and targeted to receive corresponding paging messages;
enter a sleep mode when the monitoring indicates that the paging messages do not include a respective paging message intended for the device; and
process the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device.

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the paging messages transmitted by the cell within the cell-specific paging window do not include paging messages intended for the device in response to the cell receiving an indication that the device does not support standalone operation within the specified frequency band.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the processing element is configured to further cause the device to:
receive from the cell an indication that no paging messages intended for the device will be transmitted by the cell within a given transmission cycle; and
enter the sleep mode in response to receiving the indication from the cell.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the processing element is configured to further cause the device to receive the indication through one of:
an empty paging message; or
specific downlink control information.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the processing element is configured to further cause the device to:
receive an end-of-paging (EOP) message from the cell, wherein the EOP message indicates that the cell has stopped transmitting paging messages within a given transmission cycle; and
enter the sleep mode in response to receiving the EOP message.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the processing element is configured to further cause the device to:
obtain a random time value;
start a timer based on the random time value;
initiate a random access channel procedure upon expiration of the timer.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the processing element is configured to further cause the device to start the timer after one of:
an end of the cell-specific paging window; or
after receiving the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device.

### Claim 9

A device comprising:
radio circuitry configured to facilitate wireless cellular communications of the device according to a specified radio access technology within a specified frequency band within a specified coverage area of a wireless cellular network served by a cell; and
a processing element communicatively coupled to the radio circuitry and configured to cause the device to:
indicate to the cell whether the device has a capability to support standalone operation within the specified frequency band;
monitor, during a cell-specific paging window, paging messages transmitted by the cell within the cell-specific paging window to multiple devices operating within the specified coverage area and targeted to receive corresponding paging messages;
enter a sleep mode when the monitoring indicates that the paging messages do not include a respective paging message intended for the device; and
process the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device.

### Claim 10

(canceled)

### Claim 11 (depends on 9)

The device of claim 9, wherein the paging messages transmitted by the cell within the cell-specific paging window do not include paging messages intended for the device in response to the cell receiving an indication that the device does not support standalone operation within the specified frequency band.

### Claim 12 (depends on 9)

The device of claim 9, wherein the processing element is configured to further cause the device to:
receive from the cell an indication that no paging messages intended for the device will be transmitted by the cell within a given transmission cycle; and
enter the sleep mode in response to receiving the indication from the cell.

### Claim 13 (depends on 12)

The device of claim 12, wherein the processing element is configured to further cause the device to receive the indication through one of:
an empty paging message; or
specific downlink control information.

### Claim 14 (depends on 9)

The device of claim 9, wherein the processing element is configured to further cause the device to:
receive an end-of-paging (EOP) message from the cell, wherein the EOP message indicates that the cell has stopped transmitting paging messages within a given transmission cycle; and
enter the sleep mode in response to receiving the EOP message.

### Claim 15

A non-transitory memory element storing instructions executable by a processing element to cause a device to:
operate within a specified frequency band within a specified coverage area of a wireless cellular network served by a cell;
indicate to the cell whether the device has a capability to support standalone operation within the specified frequency band;
monitor, during a cell-specific paging window, paging messages transmitted by the cell within the cell-specific paging window to multiple devices operating within the specified coverage area and targeted to receive corresponding paging messages;
enter a sleep mode when the monitoring indicates that the paging messages do not include a respective paging message intended for the device; and
process the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device.

### Claim 16

(canceled)

### Claim 17 (depends on 15)

The apparatus of claim 15, wherein the paging messages transmitted by the cell within the cell-specific paging window do not include paging messages intended for the device in response to the cell receiving an indication that the device does not support standalone operation within the specified frequency band.

### Claim 18 (depends on 15)

The apparatus of claim 15, wherein the processing element is configured to further cause the device to:
receive from the cell an indication that no paging messages intended for the device will be transmitted by the cell within a given transmission cycle; and
enter the sleep mode in response to receiving the indication from the cell.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein the processing element is configured to further cause the device to receive the indication through one of:
an empty paging message; or
specific downlink control information.

### Claim 20 (depends on 15)

The apparatus of claim 15, wherein the processing element is configured to further cause the device to:
receive an end-of-paging (EOP) message from the cell, wherein the EOP message indicates that the cell has stopped transmitting paging messages within a given transmission cycle; and
enter the sleep mode in response to receiving the EOP message.

### Claim 21 (depends on 9)

The device of claim 9, wherein the processing element is configured to further cause the device to:
obtain a random time value;
start a timer based on the random time value; and
initiate a random access channel procedure upon expiration of the timer.

### Claim 22 (depends on 21)

The device of claim 21, wherein the processing element is configured to further cause the device to start the timer after one of:
an end of the cell-specific paging window; or
after receiving the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device.

### Claim 23 (depends on 15)

The non-transitory memory element of claim 15, wherein the instructions are executable by the processing element to cause the device to:
obtain a random time value;
start a timer based on the random time value after one of:
an end of the cell-specific paging window; or
after receiving the respective paging message intended for the device when the monitoring indicates that the paging messages include the respective paging message intended for the device; and
initiate a random access channel procedure upon expiration of the timer.