PDCCH Performance Feedback via Missing Transmission Detection

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Solution Overview

Problem

Existing wireless communication systems face challenges in diagnosing and identifying performance issues related to the physical downlink control channel (PDCCH), which is critical for use cases like ultra-reliable low-latency communications (uRLLC).

Innovation Solution

A method where user equipment (UE) provides performance feedback to the base station (BS) by detecting missing or successfully decoded PDCCH transmissions and communicating an indicator of PDCCH decoding performance based on these metrics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PDCCH performance feedback is implemented, then reliability of wireless communications is improved, but device complexity increases

Engineering Contradiction:

ImprovePDCCH transmission reliabilityVSAvoidUE feedback mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the UE monitors PDCCH transmissions and provides performance indicators (such as number of successfully decoded PDCCHs, missing PDCCHs, or decoding failures) back to the base station. This feedback loop enables the base station to identify performance issues, adjust transmission parameters, and improve overall reliability of PDCCH delivery for critical communications.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The UE autonomously monitors and evaluates its own PDCCH decoding performance without requiring base station intervention. The UE independently counts successful decodes, detects missing transmissions, and generates performance indicators, then communicates these metrics to the base station for optimization purposes.

Inventive Principle:

Principle #25Self-service

2Productivity

If PDCCH performance monitoring is implemented, then productivity of communication optimization is improved, but loss of time increases

Engineering Contradiction:

Improvecommunication optimization efficiencyVSAvoidfeedback transmission time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The UE provides PDCCH performance feedback periodically rather than continuously, at configured intervals or triggered by specific events (such as detecting a certain number of failures or successful decodes). This periodic reporting mechanism balances the need for timely optimization information with the requirement to minimize overhead and time consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Instead of reporting every single PDCCH decoding outcome, the UE aggregates performance data into summary metrics (e.g., total successful decodes, total failures, missing PDCCH count) over a measurement period. This partial aggregation approach provides sufficient optimization information while significantly reducing feedback overhead and time requirements.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12309821B2Systems and methods for providing physical downlink control channel (PDCCH) performance feedback

Publication Date: 2025.05.20 QUALCOMM INC

AI summary

Some aspects of the present disclosure disclose methods and systems related to providing feedback to a base station about the performance of a physical downlink control channel (PDCCH). In some aspects, a user equipment (UE) may determine a number of missing physical downlink control channel (PDCCH) transmissions and/or a number of successful PDCCH transmissions transmitted to the UE via a PDCCH by a base station (BS) of a wireless communication network to which the UE is connected and communicate, to the BS, an indicator of PDCCH decoding performance based on the number of missing PDCCH transmissions and/or the number of successful PDCCH transmissions. Additional features are claimed and described.