PDCCH Blind Detection via RRC Configured CCE Positions
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Solution Overview
Problem
In ultra-high frequency band or satellite communication, the blind detection of Physical Downlink Control Channel (PDCCH) by User Equipment (UE) is complex due to low efficiency of power amplifiers and the need to find its own PDCCH among multiple candidates.
Innovation Solution
The method involves receiving RRC signaling to determine the Aggregation Level (AL) and configuration information of Resource Blocks (RB) in the frequency domain, allowing the UE to determine specific positions of Control Channel Elements (CCE) and blindly detect the target PDCCH, starting from the first CCE to reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs blind detection from all PDCCH candidate positions in the CORESET, then the UE can find its own PDCCH, but the detection complexity is high
Solution Approach 1:
The patent applies preliminary action by pre-determining the starting position of the first CCE for the UE's PDCCH based on RRC configuration and hash function calculations. This allows the UE to start blind detection from a predetermined position rather than searching all possible positions, significantly reducing detection complexity while maintaining reliability
Solution Approach 2:
The patent applies local quality by providing UE-specific configuration information (RRC signaling) that defines the starting position of the first CCE. This creates a localized search region for each UE within the CORESET, rather than requiring all UEs to search the entire CORESET, thereby reducing overall detection complexity
2Productivity
If multiple PDCCHs are multiplexed together in the CORESET, then resource utilization is improved, but the blind detection process becomes more complicated
Solution Approach 1:
The patent applies segmentation by dividing the CORESET into multiple search spaces, one for each UE. Each search space is defined by UE-specific parameters including the starting position of the first CCE. This segmentation allows multiple UEs to simultaneously search different regions of the CORESET, maintaining high resource utilization while reducing individual UE detection complexity
Solution Approach 2:
The patent uses preliminary action by pre-calculating and configuring the starting positions of first CCEs for multiple UEs through RRC signaling. This preliminary configuration enables efficient multiplexing of multiple PDCCHs in the CORESET while keeping each UE's blind detection process simple and targeted
Data Source
AI summary
A physical downlink control channel blind detection method, a user equipment and a readable storage medium are provided. The method includes: receiving an issued first Radio Resource Control (RRC) signaling to determine an Aggregation Level (AL) of the PDCCH; receiving an issued second RRC signaling; determining a specific position of each CCE in the CORESET based on the configuration information in the second RRC signaling; determining positions of all PDCCH candidates, and obtaining a target PDCCH by blindly detecting the PDCCH; and obtaining a mapping position of a Downlink Control Information (DCI) corresponding to a UE at a time domain sampling point by blindly detecting the time domain sampling based on the target PDCCH.