LTE Multi-UE Simulator False DCI Detection Reduction

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Solution Overview

Problem

In LTE PDCCH data decoding, false DCI detection leads to invalid decoding of PDSCH data, corruption of downlink data, unexpected ACKs and NACKs, and uplink transmission corruption due to the simulator's inability to distinguish between actual and potential DCIs.

Innovation Solution

Implementing blind DCI decoding and false DCI detection countermeasures in an LTE multi-UE simulator to identify and exclude invalid DCIs, such as filtering CCEs by energy, selecting higher aggregation levels, choosing shorter DCI formats, and verifying parameter validity, to reduce false DCI detection impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If blind DCI decoding is performed for all possible DCI values, then the simulator can detect all potential DCIs, but false DCIs are generated leading to data corruption

Engineering Contradiction:
ImproveDCI detection accuracyVSAvoiddata integrity
Core Design Contradiction:
Measurement precisionVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where the simulator monitors decoded DCI values and compares them against expected patterns and parameters. When a DCI is decoded, its validity is verified through multiple checks including parameter validation, cross-verification with other control channels, and consistency checks with previously decoded information. This feedback loop allows the system to distinguish true DCIs from false detections while maintaining comprehensive monitoring coverage.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent introduces intermediary validation layers between the blind decoding process and the actual data processing. These intermediaries include validation modules that check decoded DCI parameters against predefined criteria, filter mechanisms that block suspicious DCI values, and verification processes that cross-check decoded information with other network signals. This intermediary system prevents false DCIs from propagating to the data processing stage while allowing genuine DCIs to pass through.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Measurement precision

If the simulator monitors PDCCH for all possible DCI values, then no DCI is missed, but the complexity of decoding increases

Engineering Contradiction:
ImproveDCI detection completenessVSAvoiddecoding complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the blind decoding process into multiple independent stages: initial decoding attempt, parameter validation, cross-verification, and final confirmation. Each stage processes only the necessary subset of DCI candidates with appropriate validation rules. This segmentation allows the simulator to maintain comprehensive monitoring while reducing the computational burden at each individual processing stage by focusing only on relevant validation checks.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies partial validation actions to DCI candidates based on their likelihood of being genuine. Instead of applying full validation to all decoded DCI values, the system performs quick preliminary checks on all candidates and applies more rigorous validation only to those that pass the initial screening. This partial action approach maintains detection completeness while significantly reducing the overall decoding complexity by avoiding exhaustive validation of obviously false candidates.

Inventive Principle:
Principle #16Partial or excessive action

3Productivity

If false DCIs are not filtered, then decoding is faster, but PDSCH data becomes corrupted

Engineering Contradiction:
Improvedecoding speedVSAvoiddata accuracy
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent performs preliminary validation checks on decoded DCI values before they are used for PDSCH data decoding. These preliminary actions include checking parameter ranges, verifying format consistency, and confirming alignment with network configuration. By performing these checks in advance, the system ensures that only validated DCI values proceed to the data decoding stage, preventing data corruption while maintaining efficient processing speeds through the use of fast preliminary validation algorithms.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS9204325B2Methods, systems, and computer readable media for reducing the impact of false downlink control information (DCI) detection in long term evolution (LTE) physical downlink control channel (PDCCH) data
Publication Date: 2015.12.01 KEYSIGHT TECH SINGAPORE (SALES) PTE LTD
  • US9204325B2 patent drawing
  • US9204325B2 patent drawing
  • US9204325B2 patent drawing

AI summary

Methods, systems, and computer readable media for reducing the impact of false downlink control information (DCI) detection in long term evolution (LTE) physical downlink control channel (PDCCH) data are disclosed. According to one method, an LTE multi-UE simulator receives PDCCH data from an evolved node B (eNode B). The LTE multi-UE simulator applies blind DCI decoding to decode at least one DCI value from channel control elements that carry the PDCCH data. The LTE multi-UE simulator applies at least one false DCI detection countermeasure to identify as true or false DCIs from the DCIs detected using the blind decoding.