Two-part Wake-up Signal for IoT Energy Reduction

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Solution Overview

Problem

Current wake-up techniques in wireless communication, particularly for IoT and MTC devices, face challenges in reducing energy consumption and latency due to the need for channel sensing, cell identity identification, and synchronization, which are energy-intensive and time-consuming, especially in battery-powered devices.

Innovation Solution

Implementing a two-part wake-up signal (WUS) system where the first part includes cell-specific information for channel sensing and synchronization, and the second part is UE-specific, allowing devices to transition from an inactive to an active state efficiently without requiring broadcasted synchronization signals, thereby reducing energy consumption and latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal receives broadcasted synchronization signals and performs channel sensing using reference signals to identify cell identity and maintain synchronization, then the reliability of communication is improved, but the energy consumption increases significantly

Engineering Contradiction:

Improvesynchronization reliabilityVSAvoidterminal energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The wake-up signal is segmented into two distinct parts: a first part containing cell-specific information (synchronization and channel sensing data) and a second part containing UE-specific information. This segmentation allows the terminal to process only necessary information when waking from inactive state, reducing overall energy consumption while maintaining synchronization reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station performs preliminary actions by embedding synchronization signals and reference signals within the wake-up signal itself before the terminal transitions to active state. This eliminates the need for separate broadcasted synchronization signals, allowing the terminal to achieve synchronization and perform channel sensing immediately upon receiving the wake-up signal, thereby reducing energy consumption.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the terminal performs channel sensing, cell identity identification, and synchronization procedures after transitioning from inactive to active state, then the communication reliability is improved, but the latency increases significantly

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidwake-up latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the wake-up signal with synchronization signals and reference signals into a single integrated message. By combining these previously separate transmissions into one unified wake-up signal with two parts, the terminal can complete synchronization and channel sensing procedures simultaneously with the wake-up process, significantly reducing wake-up latency.

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If the base station transmits separate broadcasted synchronization signals and reference signals for every terminal wake-up event, then the synchronization accuracy is improved, but the network energy consumption and signaling overhead increase

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidnetwork energy consumption

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The wake-up signal is designed with multi-functionality, serving both as a wake-up trigger and as a carrier for synchronization and channel sensing information. The first part of the wake-up signal universally provides cell-specific synchronization and reference signals that can be used by any terminal waking from inactive state, eliminating the need for separate broadcasted synchronization signals and reducing network energy consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11343772B2Two-part wake-up signal

Publication Date: 2022.05.24 SONY GROUP CORP

AI summary

A wake-up signal includes a first part and a second part. The first part is related to a cell of a base station transmitting the wake-up signal and includes a synchronization signal for synchronizing a terminal with the base station. The second part is related to one or more terminals.