# US 11,310,739 B2 · Mobility robustness for discontinuous reception wake up signal

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- Number: US 11,310,739 B2
- Document ID: US11310739B2
- Status: Granted
- Kind: B2
- Application number: 16/649,728
- Filed: 2018-09-26
- Published: 2020-09-03
- Granted: 2022-04-19
- Earliest claimed: 2017-09-28
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Andreas Höglund; Paul Schliwa-Bertling
- Web page: https://patentgrep.com/patent/US11310739B2

## CPC

- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 52/0229: {where the received signal is a wanted signal}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 68/005: {Transmission of information for alerting of incoming communication}
- 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

According to an embodiment, a method for use in a wireless device is provided. The method comprises waking up from a discontinuous reception (DRX) mode in a cell. The method further comprises determining whether the cell is the same as a previous cell of the wireless device. In response to determining that the cell is not the same as the previous cell, the method further comprises determining whether the wireless device missed a wake-up signal opportunity in the cell. The method further comprises monitoring each of the paging occasions associated with the wake-up signal opportunity if the cell is not the same as the previous cell and the wake-up signal opportunity was missed.

## Claims

### Claim 1

A method for use in a wireless device, comprising:
waking up from a discontinuous reception (DRX) mode in a cell;
determining whether the cell is the same as a previous cell of the wireless device;
in response to determining that the cell is not the same as the previous cell, determining whether the wireless device missed a wake-up signal opportunity in the cell; and
monitoring each of the paging occasions associated with the wake-up signal opportunity if the cell is not the same as the previous cell and the wake-up signal opportunity was missed.

### Claim 2 (depends on 1)

The method of claim 1, wherein monitoring each of the paging occasions associated with the wake-up signal opportunity comprises monitoring one or more of the paging occasions associated with a paging time window according to LTE Release 13.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
detecting a wake-up signal during the wake-up signal opportunity; and
monitoring the paging occasions associated with the wake-up signal.

### Claim 4 (depends on 1)

The method of claim 1, further comprising re-entering the DRX mode if no paging message is detected during the monitored paging occasions.

### Claim 5 (depends on 1)

The method of claim 1, further comprising establishing a connection with the cell upon detecting a paging message for the wireless device during the monitored paging occasions.

### Claim 6 (depends on 1)

The method of claim 1, wherein determining whether the cell is the same as the previous cell is based on whether the previous cell was the last cell in which the wireless device reported a tracking area update.

### Claim 7 (depends on 1)

The method of claim 1, wherein determining whether the cell is the same as the previous cell is based on whether the previous cell was the last serving cell of the wireless device.

### Claim 8 (depends on 1)

The method of claim 1, wherein determining whether the cell is the same as the previous cell is based on whether the wireless device is determined to have remained stationary.

### Claim 9 (depends on 1)

The method of claim 1, wherein the DRX mode is an extended DRX (eDRX) mode.

### Claim 10

A wireless device comprising memory operable to store instructions and processing circuitry operable to execute the instructions, whereby the wireless device is operable to:
wake up from a discontinuous reception (DRX) mode in a cell;
determine whether the cell is the same as a previous cell of the wireless device;
in response to determining that the cell is not the same as the previous cell, determine whether the wireless device missed a wake-up signal opportunity in the cell; and
monitor each of the paging occasions associated with the wake-up signal opportunity if the cell is not the same as the previous cell and the wake-up signal opportunity was missed.

### Claim 11 (depends on 10)

The wireless device of claim 10, wherein the wireless device is operable to monitor each of the paging occasions associated with the wake-up signal opportunity comprises monitoring one or more of the paging occasions associated with a paging time window according to LTE Release 13.

### Claim 12 (depends on 10)

The wireless device of claim 10, wherein the wireless device is further operable to:
detect a wake-up signal during the wake-up signal opportunity; and
monitor the paging occasions associated with the wake-up signal.

### Claim 13 (depends on 10)

The wireless device of claim 10, wherein the wireless device is further operable to re-enter the DRX mode if no paging message is detected during the monitored paging occasions.

### Claim 14 (depends on 10)

The wireless device of claim 10, wherein the wireless device is further operable to establish a connection with the cell upon detecting a paging message for the wireless device during the monitored paging occasions.

### Claim 15 (depends on 10)

The wireless device of claim 10, wherein determining whether the cell is the same as the previous cell is based on whether the previous cell was the last cell in which the wireless device reported a tracking area update.

### Claim 16 (depends on 10)

The wireless device of claim 10, wherein determining whether the cell is the same as the previous cell is based on whether the previous cell was the last serving cell of the wireless device.

### Claim 17 (depends on 10)

The wireless device of claim 10, wherein determining whether the cell is the same as the previous cell is based on whether the wireless device is determined to have remained stationary.

### Claim 18 (depends on 10)

The wireless device of claim 10, wherein the DRX mode is an extended DRX (eDRX) mode.

### Claim 19 (depends on 10)

The wireless device of claim 10, wherein the wireless device is further operable to abstain from monitoring any paging occasions associated with the paging time window if the cell is the same as the previous cell and no wake-up signal was detected prior to the paging time window.

### Claim 20 (depends on 10)

The wireless device of claim 10, wherein the wireless device is further operable to monitor each of the paging occasions associated with the paging time window if the cell is the same as the previous cell and the wake-up signal was detected prior to the paging time window.