PDCCH False Alarm Reduction via Active RNTI Verification
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Solution Overview
Problem
PDCCH false alarms occur frequently in PDCCH sniffer devices due to the high number of valid RNTIs, leading to inaccurate scheduling information, especially when multiple DCI formats are considered, which complicates the search for intended messages and results in unreliable data for network monitoring and debugging.
Innovation Solution
A method and system that maintain a list of active RNTIs, extract PDCCH detections, and apply false alarm reduction strategies by determining if the valid RNTI is included in the list of active RNTIs, using techniques such as information sharing, acquisition monitoring, pattern detection, and network restrictions to eliminate invalid detections and determine accurate scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PDCCH sniffer device monitors all PDCCH transmissions and extracts detections for multiple DCI formats, then the coverage and monitoring capability are improved, but the number of false alarms increases significantly due to the high number of valid RNTIs
Solution Approach 1:
The system performs preliminary actions by maintaining an updated list of active RNTIs before processing PDCCH detections. This pre-established reference list enables the device to quickly verify whether detected RNTIs are valid, thereby reducing false alarms while maintaining comprehensive monitoring across multiple DCI formats
Solution Approach 2:
The patent introduces an intermediary verification mechanism using a list of active RNTIs as a mediator between the raw PDCCH detections and the final scheduling information. This intermediary list acts as a filter that validates detected RNTIs, allowing the system to maintain high monitoring capability while significantly reducing false alarm rates
2Loss of information
If the device considers multiple DCI formats with different packet lengths and structures, then the scheduling information coverage is improved, but the complexity of the search process increases
Solution Approach 1:
The patent applies segmentation by dividing the PDCCH search space into distinct regions corresponding to different DCI formats and their associated RNTI ranges. This segmentation allows the device to process each format separately using the active RNTI list, reducing overall search complexity while maintaining comprehensive scheduling information coverage
Solution Approach 2:
The system changes parameters by adapting the search strategy based on the specific DCI format being processed. By modifying search parameters such as RNTI ranges and packet length expectations for each format, the device efficiently handles multiple formats without requiring a single complex exhaustive search approach
Data Source
AI summary
Methods and systems for determining scheduling information of a base station in a network operating according to the Long Term Evolution (“LTE”) standard include monitoring transmissions on the PDCCH of the wireless base station, maintaining a list of active Radio Network Temporary Identifiers (“RNTI's”) assigned by the wireless base station to user equipment, extracting PDCCH detections from the monitored transmissions, applying at least one false alarm reduction strategy to eliminate invalid PDCCH detections from the extracted PDCCH detections, said false alarm reduction strategy including determining an RNTI that is valid for an extracted PDCCH detection and determining if the valid RNTI is included in the list of active RNTI's. Scheduling information of the wireless base station is determined from the extracted PDCCH detection.