NR BWP Switching Verification for False DCI Detection
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Solution Overview
Problem
False positive detections of downlink control information (DCI) requests to switch bandwidth parts (BWPs) can cause synchronization issues between user equipment (UE) and base stations, leading to unnecessary procedures like random access channel (RACH) and radio resource control (RRC) reestablishment.
Innovation Solution
The UE verifies the DCI request to switch BWPs by checking for conflicts with time division duplex (TDD) patterns, DCI decoder metrics, and the number of error-corrected modulation symbols to confirm the detection is not false.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE detects DCI requests to switch BWPs without verification, then BWP switching speed is improved, but false positive detections cause synchronization issues and unnecessary procedures
Solution Approach 1:
The patent applies preliminary action by verifying DCI detection accuracy before executing BWP switching. The UE checks detection metrics and compares expected versus actual DCI content prior to switching, ensuring false positives are filtered out before they can cause synchronization issues. This pre-verification step maintains reliable synchronization while enabling fast switching when detections are accurate.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors detection metrics and uses this information to adjust its DCI verification process. By continuously evaluating detection reliability and comparing expected DCI parameters with received content, the system creates a feedback loop that improves detection accuracy over time and reduces false positive switching operations.
2Measurement precision
If the UE performs verification of DCI requests using multiple checks (TDD pattern conflicts, decoder metrics, error-corrected symbols), then detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the DCI verification process into distinct, manageable checks: TDD pattern conflict detection, decoder metric evaluation, and error-corrected symbol verification. Each check operates independently and can be executed in sequence, making the complex verification process more manageable and implementable while maintaining high detection accuracy through multiple independent validation stages.
3Loss of time
If the UE rejects false positive DCI requests, then unnecessary procedures (RACH, RRC reestablishment) are reduced, but legitimate DCI requests may be missed
Solution Approach 1:
The patent applies parameter changes by adjusting detection thresholds and verification criteria dynamically. The system modifies the stringency of verification based on detected signal conditions, allowing it to be more lenient when confidence is high and more strict when uncertainty exists. This adaptive approach reduces false rejections of legitimate DCI requests while still filtering out false positives effectively.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for false positive detections of DCI requests to switch BWPs. A UE may receive a DCI request to switch from a first BWP to a second BWP and may reject the DCI request for a switch from the first BWP to the second BWP based on at least one of a conflict with a TDD pattern associated with the DCI request, a DCI decoder metric, or a number of error-corrected modulation symbols that indicates a false positive detection of the DCI request.