Wireless Node Grouping for Wake-Up Signal Targeting

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Solution Overview

Problem

Existing methods for waking up wireless devices in wireless communication networks can lead to waste of network and energy resources, particularly due to inefficient handling of Wake-Up Signals (WUS) and the resulting false paging issues.

Innovation Solution

A method where a node in a wireless communications network determines a distribution of wireless devices into groups based on resource division, allowing for targeted transmission of Wake-Up Signals to reduce false paging and enable continuous Wake-Up Receiver (WUR) operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Wake-Up Signals are transmitted to all wireless devices, then all devices can be woken up, but network resources are wasted and false paging occurs

Engineering Contradiction:

Improvepaging accuracyVSAvoidnetwork resource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent segments wireless devices into multiple groups based on their wake-up requirements and characteristics. Each group is assigned specific time-frequency resources for receiving Wake-Up Signals. This segmentation allows the network to transmit WUS only to specific groups rather than all devices, reducing false paging and network resource waste while maintaining reliable wake-up functionality.

Inventive Principle:

Principle #1Segmentation

2Speed

If Wake-Up Signals are transmitted frequently, then devices can be woken up promptly, but energy consumption increases

Engineering Contradiction:

Improvewake-up response timeVSAvoiddevice energy consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic transmission of Wake-Up Signals to designated groups at scheduled time intervals rather than continuous or frequent transmissions. Each group receives WUS at specific periodic moments, ensuring prompt wake-up when needed while allowing devices to remain in low-power state between periods, thus reducing overall energy consumption.

Inventive Principle:

Principle #19Periodic action

3Device complexity

If all wireless devices monitor the same Wake-Up Signal, then simple signal structure is maintained, but false paging increases

Engineering Contradiction:

Improvesignal structure simplicityVSAvoidpaging accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent assigns different local qualities to different device groups through dedicated time-frequency resources and group-specific WUS sequences. Each group monitors its own designated resources rather than a common signal, maintaining relatively simple signal structures within each group while eliminating false paging through resource isolation. This local differentiation resolves the contradiction between simplicity and accuracy.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250031150A1Node, Wireless Device, and Methods Performed Thereby, for Handling Signals

Publication Date: 2025.01.23 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method by a node (101), for handling signals. The node (101) operates in a wireless communications network (100). The node (101) determines (502) a distribution of one or more wireless devices (130) served by the node (101) into a plurality of groups. The determining (502) is based on a division of resources available to the node (101) into a corresponding plurality of groups. The resources comprise at least one of: code resources, frequency resources and time resources. The determined plurality of groups determines a corresponding plurality of sets of one or more signals to wake-up the one or more wireless devices (130), to be respectively monitored by the one or more wireless devices (130). The node (101) then initiates (504) transmitting the corresponding plurality of sets of one or more signals to wake-up the one or more wireless devices (130), based on the determined distribution to at least one of the wireless devices (130).