# US 12,004,080 B2 · DRX cycle length adjustment control

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- Number: US 12,004,080 B2
- Document ID: US12004080B2
- Status: Granted
- Kind: B2
- Application number: 17/481,787
- Filed: 2021-09-22
- Published: 2022-01-06
- Granted: 2024-06-04
- Earliest claimed: 2007-01-30
- Assignees: InterDigital Technology Corporation
- Applicants: InterDigital Technology Corporation
- Inventors: Stephen E. Terry; Peter S. Wang; Jin Wang
- Web page: https://patentgrep.com/patent/US12004080B2

## CPC

- H04W 52/0212: {managed by the network, e.g. network or access point is leader and terminal is follower}
- H04W 52/0229: {where the received signal is a wanted signal}
- H04W 52/0235: {where the received signal is a power saving command}
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- 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 method for controlling discontinuous reception in a wireless transmit/receive unit includes defining a plurality of DRX levels, wherein each DRX level includes a respective DRX cycle length and transitioning between DRX levels based on a set of criteria. The transitioning may be triggered by implicit rules.

## Claims

### Claim 1

A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving discontinuous reception (DRX) configuration parameters, the DRX configuration parameters comprising an indication of a first DRX cycle length, an indication of a second DRX cycle length, an indication of a first timer length, and an indication of a second timer length;
setting a first timer at the first timer length;
determining that the first timer has expired;
performing DRX using the first DRX cycle length based on determining that the first timer has expired;
setting a second timer at the second timer length based on beginning DRX operation at the first DRX cycle length;
determining that the second timer has expired; and
performing DRX using the second DRX cycle length based on determining the second timer has expired, wherein the second DRX cycle length is a multiple of the first DRX cycle length.

### Claim 2 (depends on 1)

The method of claim 1, wherein the DRX configuration parameters are received in a radio resource control (RRC) message.

### Claim 3 (depends on 1)

The method of claim 1, wherein the second timer length corresponds to a resume period.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
resetting the first timer based on transmission activity.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
resetting the second timer based on transmission activity.

### Claim 6 (depends on 1)

The method of claim 1, wherein the indication of the first DRX cycle length is received in a first information element (IE), the indication of the second DRX cycle length is received in a second IE, the indication of the first timer length is received in a third IE, and the indication of the second timer length is received in a fourth IE.

### Claim 7 (depends on 1)

The method of claim 1, wherein the indication of a second timer length is signaled as a number of DRX cycles.

### Claim 8 (depends on 1)

The method of claim 1, wherein each of the first and second timers are synchronized with respective base station timers.

### Claim 9

A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to:
receive discontinuous reception (DRX) configuration parameters, the DRX configuration parameters comprising an indication of a first DRX cycle length, an indication of a second DRX cycle length, an indication of a first timer length, and an indication of a second timer length;
set a first timer at the first timer length;
determine that the first timer has expired;
perform DRX using the first DRX cycle length based on determining that the first timer has expired;
set a second timer at the second timer length based on beginning DRX operation at the first DRX cycle length;
determine that the second timer has expired; and
perform DRX using the second DRX cycle length based on determining the second timer has expired, wherein the second DRX cycle length is a multiple of the first DRX cycle length.

### Claim 10 (depends on 9)

The WTRU of claim 9, wherein the DRX configuration parameters are received in a radio resource control (RRC) message.

### Claim 11 (depends on 9)

The WTRU of claim 9, wherein the second timer length corresponds to a resume period.

### Claim 12 (depends on 9)

The WTRU of claim 9, wherein the processor and memory are further configured to:
reset the first timer based on transmission activity.

### Claim 13 (depends on 12)

The WTRU of claim 12, wherein the processor and memory are further configured to:
reset the second timer based on transmission activity.

### Claim 14 (depends on 9)

The WTRU of claim 9, wherein the indication of the first DRX cycle length is received in a first information element (IE), the indication of the second DRX cycle length is received in a second IE, the indication of the first timer length is received in a third IE, and the indication of the second timer length is received in a fourth IE.

### Claim 15 (depends on 9)

The WTRU of claim 9, wherein the indication of a second timer length is signaled as a number of DRX cycles.

### Claim 16 (depends on 9)

The WTRU of claim 9, wherein each of the first and second timers are synchronized with respective base station timers.

### Claim 17

A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving discontinuous reception (DRX) configuration parameters from a base station, wherein the DRX configuration parameters comprise an indication of a first DRX cycle length, an indication of a second DRX cycle length, and a value for a first WTRU timer used for implicitly transitioning the WTRU between DRX cycle lengths;
operating the WTRU at the first DRX cycle length;
using a second WTRU timer to trigger a transition to the second DRX cycle length;
operating the WTRU at the second DRX cycle length, wherein the first DRX cycle length is a multiple of the second DRX cycle length;
setting the first WTRU timer upon beginning operation at the second WTRU cycle length;
determining that the first WTRU timer has expired; and
responsive to determining that the first WTRU timer has expired, transitioning to the first DRX cycle length without receiving explicit signaling from the base station.

### Claim 18 (depends on 7)

The method of claim 7, wherein the DRX configuration parameters are received in a radio resource control (RRC) message.

### Claim 19

A wireless transmit/receive unit (WTRU) comprising a processor configured to:
receive discontinuous reception (DRX) configuration parameters from a base station, wherein the DRX configuration parameters comprise an indication of a first DRX cycle length, an indication of a second DRX cycle length, and a value for a first WTRU timer used for implicitly transitioning the WTRU between DRX cycle lengths;
operate the WTRU at the first DRX cycle length;
use a second WTRU timer to trigger a transition to the second DRX cycle length;
operate the WTRU at the second DRX cycle length, wherein the first DRX cycle length is a multiple of the second DRX cycle length;
set the first WTRU timer upon beginning operation at the second WTRU cycle length;
determining that the first WTRU timer has expired; and
responsive to determining that the first WTRU timer has expired, transition the WTRU to the first DRX cycle length without receiving explicit signaling from the base station.

### Claim 20 (depends on 9)

The WTRU of claim 9, wherein the DRX configuration parameters are received in a radio resource control (RRC) message.