PDCCH CCE Position Determination Using Group Identifiers
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Solution Overview
Problem
In 5G mobile communication systems, especially in frequency range 2, the rapid attenuation of high-frequency channels necessitates beam-based transmission and reception, but traditional methods result in overlapping positions for PDCCH candidate CCEs across different search space sets, which hampers the effectiveness of repeated transmission through multiple TRPs.
Innovation Solution
A method and apparatus that determine the positions of PDCCH candidate CCEs by using configuration information, specifically group identifier information, in conjunction with a hash function, ensuring distinct frequency domain positions for different search space sets, thereby supporting frequency-division multiplexing and improving transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to determine PDCCH candidate CCE positions, then the determination process is simple, but the positions overlap across different search space sets, reducing transmission reliability
Solution Approach 1:
The patent changes the parameters used in position determination from traditional parameters to include search space set group identifier information. By modifying the input parameters of the hash function to incorporate group identifier information, the patent ensures that PDCCH candidate CCE positions for different search space sets are distinguished, preventing overlap and improving transmission reliability through multiple TRPs.
Solution Approach 2:
The patent introduces an intermediary element - the search space set group identifier information - that mediates between different search space sets. This identifier acts as a distinguishing factor that feeds into the hash function, ensuring that positions for different search space sets are separated. The intermediary prevents direct conflict between overlapping positions while maintaining the overall system structure.
2Reliability
If group identifier information is used in hash function, then non-overlapping positions are achieved, but the configuration information requirements increase
Solution Approach 1:
The search space set group identifier information serves multiple functions simultaneously: it distinguishes different search space sets for position determination, enables frequency-division multiplexing support, and facilitates repeated transmission through multiple TRPs. By making this identifier multi-functional, the patent reduces the need for additional separate configuration elements, thereby limiting the increase in configuration information quantity while achieving non-overlapping positions.
3Reliability
If frequency-division multiplexing is supported, then transmission reliability improves, but the system complexity increases
Solution Approach 1:
The patent segments the search space sets into different groups identified by group identifiers. This segmentation allows frequency-division multiplexing to be applied systematically across different groups, where each group can be associated with different frequency resources. By dividing the search space sets into manageable segments with distinct identifiers, the patent enables FDM support while keeping the complexity of managing each segment relatively simple and organized.
Data Source
AI summary
A method for determining a position of a control channel element, includes: determining configuration information of at least one target search space set; and determining, according to the configuration information of the at least one target search space set and a hash function, a set of positions for PDCCH candidate CCE of the at least one target search space set, the configuration information comprises group identifier information of the at least one target search space set.