Wake-Up Signal for DRX Power Optimization

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Solution Overview

Problem

Conventional Discontinuous Reception (DRX) cycles in user equipment (UE) lead to inefficient power consumption as the UE wakes up during scheduled time windows regardless of actual network communications, resulting in potential frequency and timing errors when waking up.

Innovation Solution

Implementing wake-up signaling (WUS) between the UE and the network to determine whether to wake up during DRX cycles, allowing the UE to remain in a sleep state during periods with no network communications, and using techniques like tapered Modulation and Coding Scheme (MCS) to mitigate frequency and timing errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE wakes up during scheduled time windows to monitor for network communications, then the UE can receive network communications, but the UE consumes power inefficiently when there are no actual communications

Engineering Contradiction:

Improvenetwork communication receptionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network transmits a wake-up signal before the scheduled time window to indicate whether the UE should wake up for network communications. This preliminary indication allows the UE to avoid waking up unnecessarily, thereby reducing power consumption while maintaining reliable communication when needed.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the UE wakes up during DRX cycles to monitor for communications, then the UE can detect network transmissions, but frequency and timing errors occur when waking up without actual communications

Engineering Contradiction:

Improvecommunication detectionVSAvoidfrequency and timing accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The wake-up signal is transmitted in advance to indicate whether the UE should wake up, allowing the UE to maintain frequency and timing accuracy by only waking up when necessary, rather than experiencing errors from unnecessary wake-ups during periods with no communications.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If the UE remains in sleep state during DRX cycles, then power consumption is reduced, but the UE may miss network communications if it does not wake up

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication reception

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The network provides feedback through the wake-up signal to indicate whether the UE should wake up for network communications. This feedback mechanism allows the UE to remain in sleep state to conserve power while reliably detecting when wake-up is necessary to receive communications.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20240314690A1Wake-Up Signal for Discontinuous Reception Operations

Publication Date: 2024.09.19 APPLE INC

AI summary

A wake up signal scheme between a network and a user equipment (UE) operating in a Discontinuous Reception (DRX) state. The UE monitors a wake up signal (WUS) occasion to determine whether a WUS is received during the WUS occasion, when the WUS is received, determines whether the WUS identifies the UE, when the WUS is received and identifies the UE, monitors an OnDuration of a Discontinuous Reception (DRX) cycle corresponding to the WUS and when the WUS is not received or the WUS does not identify the UE, remains in a sleep state during the OnDuration corresponding to the WUS.