Terminal Blind Detection Skipping for PDCCH Capacity Limits
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Solution Overview
Problem
In future wireless mobile communications systems, the limited time-domain blind detection capability of terminal devices leads to performance deterioration due to excessive blind detection tasks, necessitating a method to manage the number of Physical Downlink Control Channel (PDCCH) candidates within search spaces.
Innovation Solution
The terminal side device skips a portion of blind detection occasions within a specific time-domain range, such as PDCCH candidates or search spaces, to stay within its maximum blind detection capability, allowing channel blind detection to be performed in remaining occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a certain quantity of PDCCH candidates is configured within each search space to ensure transmission flexibility, then the transmission flexibility is improved, but the quantity of times of blind detection to be performed by the terminal exceeds the maximum blind detection capability, causing terminal performance to deteriorate
Solution Approach 1:
The patent divides the PDCCH candidates into different aggregation levels (AL0, AL1, AL2, AL3) and applies different skipping strategies to each level. The first skipping quantity is calculated based on AL0 candidates, the second based on AL1 candidates, and so on. This segmentation allows the terminal to selectively skip candidates from higher aggregation levels while maintaining detection capability at lower levels, thus resolving the contradiction between having enough candidates for flexibility and staying within blind detection capability limits.
Solution Approach 2:
The patent introduces dynamic calculation of skipping quantities based on the total number of PDCCH candidates and the maximum blind detection capability. The first skipping quantity is determined as the difference between the total number of candidates and the maximum capability, with adjustments made for each aggregation level. This parameter change approach allows the system to adapt the number of detected candidates to match the terminal's capability while preserving transmission flexibility through strategic configuration of remaining candidates.
2Reliability
If the quantity of PDCCH candidates is reduced to stay within maximum blind detection capability, then the terminal performance is improved, but the transmission flexibility deteriorates
Solution Approach 1:
The patent segments the PDCCH candidates by aggregation level and applies differential skipping strategies. Instead of uniformly reducing all candidates, it calculates specific skipping quantities for each aggregation level (AL0, AL1, AL2, AL3), allowing the terminal to maintain a diverse set of candidates across different levels. This segmentation preserves transmission flexibility by ensuring candidates from multiple aggregation levels remain available for scheduling decisions.
Solution Approach 2:
The patent applies partial skipping rather than complete reduction. The first skipping quantity is calculated to reduce the total number of candidates to match maximum capability, but the skipping is distributed partially across different aggregation levels. This partial action approach ensures that while the overall number of candidates is reduced to fit within capability limits, the distribution across aggregation levels maintains sufficient flexibility for transmission decisions.
Data Source
AI summary
The present disclosure provides a channel blind detection method, a signal transmission method and related devices. The channel blind detection method includes, when the quantity of times of blind detection to be performed by a terminal side device within a specific time-domain range exceeds a maximum blind detection capability, skipping, by the terminal side device, a part of blind detection occasions within the specific time-domain range, and performing channel blind detection in the remaining blind detection occasions. The maximum blind detection capability is the maximum quantity of times of blind detection performed by the terminal side device within the specific time-domain range, and the remaining quantity of times of blind detection to be performed by the terminal side device within the specific time-domain range does not exceed the maximum blind detection capability. According to the present disclosure, it is able to improve performance of the terminal side device.