Partial CSI-RS RE Mapping for High-Port MIMO Overhead
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Solution Overview
Problem
In wireless communication systems, particularly those advancing towards 6G, the overhead from full CSI-RS RE mapping becomes impractical due to high CSI-RS port counts, consuming significant resources and undermining large-scale MIMO operation.
Innovation Solution
Implementing partial CSI-RS RE mapping, where fewer REs than CSI-RS ports are allocated to each CDM group, reducing overhead while maintaining channel estimation performance through advanced estimation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full CSI-RS RE mapping is used, then channel estimation accuracy is maintained, but overhead becomes impractical due to high CSI-RS port counts
Solution Approach 1:
The patent applies partial RE mapping where only a subset of REs are mapped to CDM groups rather than mapping all REs. Specifically, when the number of REs exceeds the number of CDM groups, only enough REs are mapped to satisfy the channel estimation requirements, leaving some REs unmapped. This partial action reduces overhead while maintaining sufficient measurement precision for channel estimation.
Solution Approach 2:
The patent changes the mapping parameter from a one-to-one correspondence between REs and CDM groups to a many-to-one mapping where multiple REs can be associated with fewer CDM groups. By adjusting the mapping relationship parameter, the system reduces the total number of RE mappings required while maintaining the ability to accurately estimate channel characteristics through the remaining mapped REs.
2Measurement precision
If full CSI-RS RE mapping is used, then channel estimation is accurate, but time-frequency resources are consumed inefficiently
Solution Approach 1:
The patent implements partial RE mapping where only the necessary minimum number of REs are mapped to achieve accurate channel estimation. By avoiding the full mapping of all REs to CDM groups, the system reduces resource consumption in the time-frequency domain while maintaining sufficient measurement precision, thereby improving spectral efficiency.
Solution Approach 2:
The patent extracts and removes unnecessary RE mappings from the full CSI-RS configuration. By identifying and excluding redundant RE mappings that do not contribute to channel estimation accuracy, the system reduces overhead and frees up time-frequency resources for other communications, thus improving productivity and spectral efficiency.
Data Source
AI summary
Various aspects of the present disclosure relate to techniques for partial CSI-RS RE mapping. An NE is configured to configure a CSI-RS resource comprising a plurality of CSI-RS ports grouped into one or more CDM groups; generate, for the CSI-RS resource, a configuration message comprising one or more indicators defining a partial resource element (RE) mapping in a time domain or a frequency domain, wherein the partial RE mapping specifies a quantity of REs for the at least one CDM group, wherein the quantity of REs is less than a quantity of CSI-RS ports of the at least one CDM group; and transmit the configuration message to a UE to enable the UE to receive and measure the CSI-RS according to the partial RE mapping.