Dynamic PDCCH Skipping for Timely Scheduling Requests

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Solution Overview

Problem

In 5G communication systems, PDCCH monitoring can lead to increased power consumption when scheduling requests are pending, particularly during PDCCH skipping, affecting the efficiency of UL grant transmission.

Innovation Solution

A method and system where a terminal cancels or ignores PDCCH skipping on specific serving cells based on the type of scheduling request triggered, such as buffer status report (BSR), beam failure recovery, or consistent listen before talk (LBT) failure, to optimize power consumption and ensure timely UL grant transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PDCCH monitoring is continuously performed, then scheduling requests are processed timely, but power consumption increases

Engineering Contradiction:

Improvescheduling request processing timelinessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic PDCCH monitoring by allowing the terminal to flexibly switch between monitoring and skipping modes based on scheduling request status. When SR is triggered and not canceled, the terminal cancels PDCCH skipping and resumes monitoring, ensuring timely UL grant reception. When SR is not triggered, the terminal applies PDCCH skipping to reduce power consumption, creating a dynamic adaptation mechanism that resolves the contradiction between reliability and energy efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the PDCCH monitoring parameter dynamically based on scheduling request state. The terminal adjusts the PDCCH skipping status (monitoring interval and duration parameters) according to whether SR is triggered, transforming a static monitoring configuration into a variable parameter system that optimizes power consumption while maintaining scheduling reliability

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If PDCCH skipping is applied, then power consumption is reduced, but UL grant transmission timing is delayed

Engineering Contradiction:

Improvepower consumptionVSAvoidUL grant transmission delay

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent dynamically adjusts PDCCH skipping duration and monitoring recovery timing based on scheduling request status. When SR is triggered, the terminal immediately cancels PDCCH skipping and resumes monitoring, minimizing UL grant transmission delay. When SR is not triggered, the terminal maintains PDCCH skipping to reduce power consumption, creating a dynamic time-management mechanism that balances speed and energy efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent prepares for potential UL grant reception by monitoring SR trigger status in advance. The terminal proactively cancels PDCCH skipping when SR is triggered, ensuring that monitoring is restored before the UL grant arrives, thereby preventing transmission delays while maintaining power savings during normal operation

Inventive Principle:

Principle #10Preliminary action

3Reliability

If PDCCH skipping is canceled for all serving cells, then scheduling requests are processed reliably, but power wastage increases

Engineering Contradiction:

Improvescheduling request processing reliabilityVSAvoidpower wastage

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by differentiating PDCCH monitoring behavior across different serving cells based on SR trigger status. Instead of uniformly canceling or maintaining PDCCH skipping across all cells, the terminal selectively adjusts monitoring only on cells where SR is triggered, ensuring reliable UL grant reception on relevant cells while maintaining power savings on other cells, thus resolving the contradiction between reliability and energy efficiency at a granular level

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the PDCCH monitoring control by separating serving cells into different groups based on SR status. The terminal independently controls PDCCH skipping cancellation on a per-cell or per-cell-group basis rather than applying a unified approach to all cells, enabling selective power consumption optimization while maintaining scheduling reliability where needed

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12418927B2System and method of PDCCH skipping and scheduling request

Publication Date: 2025.09.16 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides method and apparatus for physical downlink control channel (PDCCH) monitoring. The method comprises receiving, from a base station, downlink control information (DCI) including an indication indicating skipping of PDCCH monitoring for a duration; in case that a scheduling request (SR) is triggered and not canceled, identifying whether the SR is triggered for a buffer status report (BSR); determining at least one serving cell, based on the identified result; and cancelling the skipping of PDCCH monitoring on the at least one serving cell.