Paging Early Indication Scheduling for RedCap Power-Latency Balance

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing power consumption and latency for reduced capability (RedCap) devices, particularly in scenarios involving paging early indication (PEI) and service data transmission (SDT) in non-RRC_CONNECTED states, which affect network performance and user experience.

Innovation Solution

Implementing mechanisms for paging early indication (PEI) and service data transmission (SDT) in non-RRC_CONNECTED states, utilizing optimized protocol stacks and configurations for RedCap devices, including bandwidth part (BWP) management and beam management procedures, to enhance power efficiency and reduce latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If RedCap devices perform continuous monitoring for paging and data transmission in non-RRC_CONNECTED states, then network responsiveness and data transmission capability are improved, but power consumption increases

Engineering Contradiction:

Improvenetwork responsivenessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network sends a Paging Early Indication (PEI) message before the actual paging message to preliminarily notify the RedCap device that a paging message will be transmitted. This allows the device to enter a low-power state during the interval between PEI and the actual paging message, reducing power consumption while maintaining network responsiveness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements periodic paging opportunities with specific timing patterns, where RedCap devices only need to wake up at designated paging occasions to monitor for PEI messages. This periodic monitoring approach reduces power consumption compared to continuous monitoring while ensuring the device doesn't miss important paging or data transmission opportunities.

Inventive Principle:

Principle #19Periodic action

2Loss of time

If RedCap devices wake up frequently to monitor paging messages, then latency for receiving paging and data transmission notifications is reduced, but power consumption increases

Engineering Contradiction:

Improvepaging latencyVSAvoidpower consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The PEI message serves as a preliminary notification that alerts the RedCap device in advance that a paging message will be transmitted in an upcoming paging occasion. This allows the device to wake up only when necessary, reducing both latency (by ensuring it wakes up at the right time) and power consumption (by avoiding unnecessary wake-ups).

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The PEI message acts as an intermediary between the network's desire to page the device and the device's need to conserve power. It provides a two-stage notification system where the first stage (PEI) allows the device to make an informed decision about whether to wake up for the second stage (actual paging message), optimizing the balance between latency and power consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If RedCap devices monitor all bandwidth parts for paging, then paging reliability is improved, but device complexity and processing requirements increase

Engineering Contradiction:

Improvepaging reliabilityVSAvoidmonitoring complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network configures specific bandwidth parts (BWPs) for paging monitoring rather than requiring monitoring of all BWPs. This allows the RedCap device to focus its monitoring resources on specific local frequency regions where paging messages are expected, reducing complexity while maintaining reliability for the configured paging BWPs.

Inventive Principle:

Principle #3Local quality

4Use of energy by moving object

If RedCap devices implement optimized protocol stacks for non-RRC_CONNECTED states, then power efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvepower efficiencyVSAvoidprotocol stack complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The protocol stack is segmented into different operational modes for non-RRC_CONNECTED states, with simplified processing paths specifically designed for power-efficient operation. The device can selectively activate specific protocol functions based on its current state and the received PEI message, reducing overall complexity while improving power efficiency through targeted optimization of critical paths.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12574897B2Paging early indication

Publication Date: 2026.03.10 OFINNO LLC

AI summary

A wireless device receives a SIB1 message indicating a first number of PDCCH monitoring occasions, for receiving a paging early indication (PEI), of a PEI occasion associated with a paging occasion, a second number of PDCCH MOs, for receiving a paging message, of the paging occasion, and a third number of SSBs. The wireless device skips monitoring, a first PDCCH for receiving the PEI, over the first number of PDCCH MOs, in response to each of the first number of PDCCH MOs, of the PEI occasion, overlapping with at least one resource element (RE) of a SSB of the third number of SSBs. The wireless device, in response to skipping monitoring the first PDCCH, monitors, over the second number of PDCCH MOs, a second PDCCH for a DCI scheduling the paging message.