Reference Signal Mapping in Wireless CORESET Overlap
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Solution Overview
Problem
In next-generation wireless communication systems, the overlap between a control resource set (CORESET) and a synchronization signal block (SSB) complicates the reception of reference signals, affecting channel estimation performance in user equipment (UE).
Innovation Solution
The method involves mapping the reference signal to a remaining resource region within the CORESET, excluding the overlap region with the SSB, and applying appropriate precoding to ensure effective channel estimation, using higher layer signaling to manage the mapping and precoding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference signal is mapped to the entire CORESET including the overlap region with SSB, then the channel estimation operation can be performed across the full control resource set, but the channel estimation performance deteriorates due to signal interference in the overlap region
Solution Approach 1:
The patent extracts the overlap region between CORESET and SSB from the reference signal mapping area. The network device determines a first resource region within the CORESET that overlaps with the SSB, and excludes this region from reference signal mapping. This extraction resolves the contradiction by removing the harmful overlap region while preserving the rest of the CORESET for reference signal mapping, thereby maintaining channel estimation performance without unnecessary signal interference.
Solution Approach 2:
The patent segments the CORESET into two distinct regions: a first resource region that overlaps with the SSB and is excluded from reference signal mapping, and a second resource region that does not overlap with the SSB and is used for reference signal mapping. This segmentation allows the system to selectively apply different mapping strategies to different regions, improving overall channel estimation performance by avoiding the interfering overlap region.
2Reliability
If the reference signal is mapped to exclude the overlap region with SSB, then the channel estimation performance is improved by avoiding signal interference, but the available resources for channel estimation are reduced
Solution Approach 1:
The patent converts the harmful effect of the CORESET-SSB overlap into a beneficial resource allocation strategy. By identifying the overlap region and excluding it from reference signal mapping, the system prevents signal interference that would degrade control channel decoding reliability. The excluded overlap region effectively becomes a protected area where SSB signals can transmit without causing harmful interference to reference signals, thereby improving overall system reliability despite the reduction in reference signal resources.
3Ease of operation
If the same precoding is applied across the entire CORESET, then the channel estimation operation is simplified, but the estimation accuracy deteriorates when the CORESET overlaps with SSB due to different channel characteristics in the overlap region
Solution Approach 1:
The patent applies different precoding strategies to different regions of the CORESET. Specifically, different precoding may be applied in the first resource region (overlap region) and the second resource region (non-overlap region). This local quality approach resolves the contradiction by allowing the system to optimize precoding for each region's specific channel characteristics, thereby maintaining high channel estimation accuracy in both regions while accounting for the different interference environments.
Data Source
AI summary
Proposed is a method for receiving a reference signal by a terminal in a wireless communication system. The method comprises: receiving a control resource set (CORESET) and information on a reference signal mapped to a resource included in the CORESET; and receiving the reference signal on the basis of the information, wherein, when the CORESET overlaps a synchronization signal/physical broadcast channel block (SSB), the reference signal is mapped to a remaining resource region except for an overlapping resource region in which the CORESET overlaps the SSB in the CORESET.