PDCCH Reencoding Validation for Invalid Candidate Filtering
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Solution Overview
Problem
Current techniques for multi-UE testing of base stations consume significant computing and networking resources due to computationally intensive PDCCH blind detection, leading to unnecessary messaging and reduced efficiency in decoding physical downlink control channel signals.
Innovation Solution
A testing system performs channel reencoding to reduce invalid PDCCH signals by decoding and reencoding encoded bits, calculating error probabilities, and determining a bit mismatch ratio to filter out invalid candidates before further processing, thereby reducing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH blind detection is performed using conventional decoding methods, then downlink control information can be extracted, but computing and networking resources are consumed excessively and unnecessary messaging occurs
Solution Approach 1:
The patent applies preliminary action by performing channel reencoding on decoded coded bits before full PDCCH validation. The system reencodes the decoded bits and compares the reencoded bits with the originally received coded bits to calculate a bit mismatch ratio. This preliminary validation step filters out invalid PDCCH candidates early in the processing chain, preventing unnecessary consumption of computing and networking resources that would otherwise be spent on fully processing invalid signals.
2Reliability
If PDCCH blind detection is performed using conventional decoding methods, then downlink control information can be extracted, but unnecessary messaging occurs reducing system efficiency
Solution Approach 1:
The patent implements preliminary validation by calculating the bit mismatch ratio between reencoded and original coded bits before committing to full PDCCH processing. Invalid candidates are identified and discarded at this preliminary stage, preventing unnecessary messaging and processing. This approach maintains reliable detection of valid PDCCH signals while dramatically improving overall system processing efficiency by eliminating wasted operations on invalid candidates.
3Loss of energy
If channel reencoding and bit mismatch calculation are performed, then invalid PDCCH signals are filtered reducing resource consumption, but additional processing steps are added
Solution Approach 1:
The patent uses copying by creating a reencoded version of the decoded coded bits and comparing it with the original received coded bits. This copying approach allows validation of PDCCH candidates without requiring complete processing chains or additional hardware structures. The reencoding process generates a copy that can be directly compared to the original, providing an efficient validation mechanism that reduces resource consumption while adding minimal processing complexity.
Data Source
AI summary
A device may receive a PDCCH signal, may decode encoded bits of the PDCCH signal to generate coded bits, may reencode the coded bits, and may calculate a detection error probability of each coded bit at an output of soft demodulation. The device may calculate a channel decoding error probability that cyclic redundancy check bits are still attached to the coded bits, and may calculate an error probability of channel reencoding, of each coded bit, due to error propagation of polar decoding and reencoding. The device may calculate a probability density of a BMR associated with the coded bits, and may calculate a threshold based on the detection error probability, the channel decoding error probability, the error probability of channel reencoding, and the probability density of a BMR. The device may determine that the PDCCH signal is invalid based on the BMR being greater than the threshold.