PDSCH Mapping with DMRS Positioning in 5G CORESET
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation 5G networks, there is a challenge in efficiently managing resources for downlink control and data channels to optimize data transmission and reception, especially in scenarios requiring high spectrum efficiency, ultra-reliability, and massive connectivity, where existing methods face issues with resource allocation and interference.
Innovation Solution
A method for receiving a Physical Downlink Shared Channel (PDSCH) in user equipment (UE) from a base station (BS) involves receiving control resource sets, rate matching information, and Downlink Control Information (DCI) to map the PDSCH into control resource sets, with demodulation reference signals (DMRS) positioned to avoid overlap, allowing efficient resource sharing between control and data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control resource sets (CORESETs) and data channels (PDSCH) are allocated in overlapping frequency resources, then resource utilization is improved, but interference between control and data channels increases
Solution Approach 1:
The patent applies time-domain dimensioning to resolve the frequency-domain resource conflict. By determining DMRS positioning based on temporal relationships (whether DCI indicates first OFDM symbol index, and relative positioning after CORESET symbols), the system enables frequency resource overlap while avoiding interference through time-division multiplexing of reference signals and data.
2Object-affected harmful factors
If demodulation reference signals (DMRS) are positioned to avoid CORESET overlap, then interference is reduced, but resource flexibility and efficiency decrease
Solution Approach 1:
The patent implements dynamic DMRS positioning that adapts to the actual CORESET configuration and DCI content. The DMRS symbol position is determined by runtime conditions (whether DCI indicates first symbol index, number of CORESET symbols), allowing the system to maximize resource efficiency while maintaining interference avoidance through flexible, condition-based reference signal placement.
Solution Approach 2:
The system uses the DCI message itself to determine DMRS positioning. The DCI indicates whether the first OFDM symbol index is provided, and this self-referential information guides the UE to correctly position DMRS relative to CORESET, enabling autonomous interference avoidance without additional signaling overhead.
3Productivity
If rate matching is performed to map PDSCH into CORESET, then resource sharing is improved, but processing complexity increases
Solution Approach 1:
The patent applies rate matching selectively only to the specific frequency resources where PDSCH and CORESET overlap, rather than performing global rate matching across all resources. This localized approach maintains resource sharing efficiency while minimizing processing complexity by focusing computational effort only on the overlapping resource regions.
Data Source
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AI summary
A method for receiving data in a user equipment (UE) from an eNB in a wireless communication system is disclosed. The method comprises the steps of receiving one or more control resource set (CORESET) regions; receiving rate matching information from a higher layer; and receiving the data based on the one or more CORESET regions and the rate matching information, wherein the data are mapped into at least one CORESET indicated by the higher layer among the one or more CORESETs on the basis of the rate matching information.