GTS DCI Mechanism for Wireless Device Power Management

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Solution Overview

Problem

Existing wireless communication technologies face challenges in efficiently managing power consumption in wireless devices by reducing unnecessary PDCCH monitoring during discontinuous reception (DRX) operations.

Innovation Solution

The proposed solution involves a Go-To-Sleep (GTS) DCI mechanism that uses repurposed or reserved bits in existing DCI formats to indicate to wireless devices when they can enter a sleep state, thereby reducing PDCCH monitoring and conserving power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wireless devices continuously monitor PDCCH during DRX operations, then network control information is reliably received, but power consumption increases

Engineering Contradiction:

Improvereliable reception of network control informationVSAvoidpower consumption in wireless device

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements discontinuous reception (DRX) where the wireless device periodically wakes up to monitor PDCCH for a duration called 'onDuration' and then enters sleep mode. This periodic monitoring pattern allows the device to balance between receiving network control information and conserving power, rather than continuously monitoring PDCCH

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent introduces a go-to-sleep (GTS) indication mechanism where the wireless device autonomously determines when to enter sleep mode based on receiving a GTS indicator in DCI format during its onDuration. This self-service approach allows the device to independently optimize its power consumption without continuous network control, reducing unnecessary PDCCH monitoring while maintaining reliable reception when needed

Inventive Principle:

Principle #25Self-service

2Use of energy by moving object

If wireless devices enter sleep state early to save power, then energy efficiency improves, but latency in receiving control information increases

Engineering Contradiction:

Improveenergy efficiency in DRX operationsVSAvoidlatency in control information reception

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent uses the GTS indication mechanism where the network sends a go-to-sleep indicator to the wireless device during its onDuration, allowing the device to enter sleep mode early and predictably. This preliminary notification enables the device to prepare for sleep without missing critical control information, as the GTS indication itself serves as the final control command before sleep

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the wireless device monitors PDCCH during onDuration for GTS indications from the network. The network observes device behavior and sends GTS indications at optimal times based on traffic patterns, creating a feedback loop that balances power savings with timely control information delivery

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12207197B2Method for causing a wireless device to enter a sleep state based on a GTS indication in a received DCI

Publication Date: 2025.01.21 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A system, network node and wireless device a provided. The wireless device receives, during an active time, downlink control information, DCI, having a predefined DCI format from the network node. The predefined DCI format includes at least one bit indicating that the DCI includes a go-to-sleep, GTS, indication. The wireless device is caused to enter a sleep state based at least in part on the GTS indication.