Paging Early Indication for UE Idle-Mode Power Saving

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Solution Overview

Problem

5G/NR UEs in idle/inactive mode consume significant power due to unnecessary wake-ups for paging message monitoring when no message is intended for them, as they periodically check for paging messages in paging occasions without explicit indication.

Innovation Solution

Implementing a PDCCH-based wake-up signal (WUS) or paging early indication (PEI) to explicitly inform UEs when to wake up for potential paging messages, providing UE sub-grouping information and TRS availability, configured through higher layers with parameters like P-RNTI, payload size, and search space settings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UE periodically wakes up to monitor paging messages in paging occasions, then the UE can receive paging messages when needed, but the UE consumes significant power due to unnecessary wake-ups when no message is intended for it

Engineering Contradiction:

Improvepaging message reception reliabilityVSAvoidUE power consumption in idle/inactive mode

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network transmits a wake-up signal (WUS) or paging early indication (PEI) before the paging occasion to preliminarily indicate whether a paging message will be transmitted. The UE wakes up only when this preliminary indication suggests a paging message is intended for it, thereby avoiding unnecessary wake-ups and reducing power consumption while maintaining reliable paging reception.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the network transmits wake-up signals to indicate paging occasions, then UE power consumption is reduced, but the system requires additional signaling overhead and configuration complexity

Engineering Contradiction:

ImproveUE power consumption in idle/inactive modeVSAvoidsystem configuration complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The wake-up signal utilizes existing downlink control channel structures and RNTI mechanisms already present in the 5G system. The PEI/WUS is transmitted using PDCCH with appropriate RNTI scrambling, leveraging existing universal control channel infrastructure rather than introducing entirely new signaling mechanisms, thus reducing system complexity while achieving power savings.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12484019B2Techniques for paging early indication for UE power saving in idle/inactive state

Publication Date: 2025.11.25 INTEL CORP

AI summary

Various embodiments herein provide techniques paging early indication for a user equipment in an idle and/or inactive state. Other embodiments may be described and claimed.