PDCCH Threshold Determination for 5G Cell Aggregation
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Solution Overview
Problem
In the context of 4G and 5G mobile communication systems, there is a lack of efficient methods to determine the second threshold of each type of subcarrier spacing in each span, particularly in cell aggregation scenarios with enhanced PDCCH monitoring capability.
Innovation Solution
An information determination method is proposed that involves acquiring the number of cells meeting specific conditions, the total number of downlink cells, the number of supported cells reported by the terminal, and a first threshold. Based on these parameters, a second threshold for a target subcarrier spacing is determined, allowing for the effective allocation of PDCCH detection candidate sets and non-overlapping CCEs in each span.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the enhanced PDCCH monitoring capability is introduced in cell aggregation scenario, then the terminal can support more PDCCH detection candidates and non-overlapping CCEs, but there is no efficient way to determine the second threshold for each subcarrier spacing type in each span
Solution Approach 1:
The patent changes the parameter determination approach by introducing a second threshold specific to each subcarrier spacing type within each span, rather than using a single aggregate threshold. This allows the system to adapt threshold values based on specific subcarrier spacing configurations (e.g., 15kHz, 30kHz, 60kHz, 120kHz), thereby improving monitoring reliability for enhanced PDCCH capability while maintaining manageable complexity through standardized determination methods.
2Loss of time
If transmission is carried out with short transmission time interval and low bit rate to support ultra-reliable and low latency transmission, then the latency is reduced, but the number of PDCCH detection candidates and non-overlapping CCEs needs to be carefully managed
Solution Approach 1:
The patent segments the slot into multiple spans and further divides each span into multiple PDCCH monitoring occasions. This segmentation allows the terminal to distribute PDCCH detection candidates across multiple smaller time intervals rather than concentrating them in a single occasion, thereby reducing the burden on resource allocation complexity while supporting short transmission time intervals for low-latency transmission.
Solution Approach 2:
The patent introduces dynamic threshold determination for each subcarrier spacing type within each span, allowing the system to adaptively manage the number of PDCCH detection candidates and non-overlapping CCEs based on specific configuration requirements. This dynamic approach enables flexible resource allocation that can accommodate varying latency requirements without overwhelming the terminal's processing capability.
3Loss of time
If multiple PDCCH transmission opportunities are provided in a slot to reduce waiting time, then the latency is reduced, but the terminal's detection capability may be exceeded
Solution Approach 1:
The patent applies local quality by setting specific second threshold values for each subcarrier spacing type within each span, rather than using a uniform threshold across all configurations. This allows the system to optimize the number of PDCCH detection candidates locally for each span based on its specific subcarrier spacing requirements, ensuring that the terminal's detection capability is not exceeded while still providing multiple transmission opportunities to reduce waiting time.
Data Source
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AI summary
Provided are an information determination method and device, an information adjustment method, a threshold usage method, a terminal, and a storage medium. The information determination method includes: determining a second threshold of a target subcarrier spacing according to the number of cells that meet a first set condition, the total number of downlink cells, the number of supported cells reported by a terminal, and a first threshold.