CRC False Alarm Mitigation Using Payload-Based SINR Verification
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Solution Overview
Problem
In broadband cellular networks, cyclic redundancy checks (CRC) can result in false alarms due to inaccurate signal-to-interference-plus-noise ratio (SINR) estimation when there are insufficient demodulation reference signal resources, leading to increased false alarm and misdetection rates, particularly in scenarios with a small number of resource blocks.
Innovation Solution
The proposed method involves reconstructing the transmitted signal after a successful CRC pass, estimating SINR based on the decoded payload, and comparing it to a threshold to determine if the CRC pass is reliable, thereby reducing false alarms and misdetections by utilizing a more robust channel estimation with additional data points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic redundancy check is performed with insufficient demodulation reference signal resources, then data validation can be performed, but false alarm rate increases due to inaccurate SINR estimation
Solution Approach 1:
The system performs preliminary actions by reconstructing the transmitted signal from decoded payload before final validation. This preliminary reconstruction enables a second verification step where the reconstructed signal is compared against the original received signal to verify SINR estimation accuracy, thereby reducing false alarms caused by insufficient reference signal resources
Solution Approach 2:
The system implements feedback by using the decoded payload to reconstruct the transmitted signal and then verifying this reconstruction against the original signal. This feedback loop provides a mechanism to detect and correct false alarm conditions, improving the reliability of data validation when reference signal resources are limited
2Measurement precision
If more demodulation reference signal resources are allocated, then SINR estimation accuracy improves, but resource consumption increases
Solution Approach 1:
The system applies self-service by using the decoded payload itself to reconstruct the transmitted signal for verification purposes. Instead of requiring additional reference signal resources, the system leverages the decoded data to create its own verification signal, thereby achieving accurate SINR estimation without increasing resource consumption
Solution Approach 2:
The system changes the parameter being used for verification from dedicated reference signals to reconstructed signal components. By transforming the verification approach to use payload-derived signals instead of separate reference signals, the system maintains measurement precision while reducing the quantity of reference signal resources required
3Productivity
If CRC validation is performed without additional verification, then processing speed is maintained, but false alarm and misdetection rates increase
Solution Approach 1:
The system applies partial action by performing verification only on cases where CRC validation passes. Instead of verifying all received data, the system selectively applies the additional verification step only to potentially valid transmissions, thereby maintaining processing speed for failed cases while improving reliability for successful validations
Solution Approach 2:
The validation process is segmented into two independent stages: first CRC validation, then signal reconstruction verification. This segmentation allows the system to quickly filter out invalid data through CRC checking while applying the more computationally intensive verification only to candidates that pass the initial check, preserving overall processing speed while enhancing reliability
Data Source
AI summary
A system can receive data from a device on a channel for broadband cellular communications. The system can, based on determining that a cyclic redundancy check passes for the data, decode a payload of the data to produce a transmitted signal. The system can determine a metric of signal quality for the channel based on at least a portion of the transmitted signal that is separate from a pilot resource. The system can compare the metric of signal quality to a value specified by a signal quality criterion, to produce a signal quality result, wherein, based on the signal quality result indicating that the metric of signal quality is less than the value specified by the signal quality criterion, determine that the cyclic redundancy check passing for the data comprises a false alarm, and classify the data as a discontinuous transmission; and otherwise, determine that the data is valid.