PDCCH Blind Decoding False Alarm Reduction
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Solution Overview
Problem
Wireless communication apparatuses experience decreased throughput and unnecessary power consumption due to false alarms caused by incorrect channel scheduling resulting from mistaken cyclic redundancy check (CRC) failures during decoding, which can lead to incorrect information being used for communication with base stations.
Innovation Solution
The method involves receiving and repeatedly transmitting physical downlink control channels (PDCCH) in a search space, performing blind decoding, and comparing control information passing a cyclic redundancy check (CRC) to identify and filter out control information that may cause false alarms, thereby preventing incorrect channel scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed on multiple candidate PDCCHs without verification, then decoding speed is maintained, but false alarm rate increases leading to incorrect channel scheduling
Solution Approach 1:
The patent applies preliminary action by performing CRC verification on decoded control information before using it for channel scheduling decisions. The wireless communication apparatus verifies the decoded PDCCH information through CRC check and comparison with previously decoded information to confirm validity before acting on it, preventing false alarms from causing incorrect scheduling while maintaining efficient decoding operations
Solution Approach 2:
The patent implements feedback by comparing the currently decoded control information with previously decoded control information from the same search space. This feedback mechanism allows the system to verify the consistency and validity of decoded information, identifying and eliminating false alarms through comparison results before proceeding with channel scheduling
2Reliability
If CRC verification and comparison are performed on decoded control information, then false alarm rate decreases, but processing time and complexity increase
Solution Approach 1:
The patent applies local quality by performing verification operations selectively - only on control information decoded from the same search space and only when comparing with previously stored decoded information. This targeted verification approach focuses computational resources on critical verification points rather than uniformly processing all decoded information, reducing overall processing complexity while maintaining high reliability
Solution Approach 2:
The patent uses copying by storing previously decoded control information in memory and using it as a reference for verifying current decoded information. This copying mechanism allows the system to compare current decoding results with historical valid results, providing a simple and efficient verification method that reduces complexity compared to more sophisticated verification algorithms
3Speed
If all decoded control information is used for channel scheduling, then scheduling responsiveness is improved, but throughput decreases due to mismatches from false alarms
Solution Approach 1:
The patent applies preliminary action by verifying control information through CRC check and comparison before using it for channel scheduling. This preliminary verification ensures that only valid control information is used for scheduling decisions, preventing false alarms from causing throughput degradation while maintaining responsive scheduling for verified information
Solution Approach 2:
The patent implements feedback by using comparison results of decoded control information to determine whether to proceed with channel scheduling. The feedback mechanism allows the system to respond appropriately to verification outcomes - proceeding with scheduling when information is valid and avoiding scheduling when false alarms are detected, thus maintaining both responsiveness and throughput
Data Source
AI summary
A method of operating a wireless communication apparatus is described. The method includes receiving, a repeated physical downlink control channel (PDCCH) from a base station, performing blind decoding on a plurality of candidate PDCCHs, performing a cyclic redundancy check (CRC), comparing the at least two pieces of control information with each other, and determining whether to terminate the blind decoding based on the comparison.