CSI-RS RE Mapping Configuration for 5G NR MIMO Systems
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Solution Overview
Problem
Next-generation wireless communication systems, such as 5G New Radio (NR), face challenges in efficiently configuring and transmitting Channel State Information Reference Signals (CSI-RS) across multiple-input multiple-output (MIMO) systems with up to 32 antenna ports, requiring flexible resource element (RE) patterns without overwhelming complexity.
Innovation Solution
The configuration of CSI-RS resource element mapping for user equipment (UE) involves determining RE patterns at both frequency and time domains, using code division multiplexing (CDM) with specific group sizes and bitmaps for signaling, allowing for flexible aggregation of component patterns to support diverse antenna ports while maintaining manageable complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS RE mapping configuration is implemented for up to 32 antenna ports in NR systems, then channel state information measurement capability is improved, but system complexity increases
Solution Approach 1:
The patent segments the CSI-RS resource element mapping configuration into multiple components including CDM group identification, component RE pattern definitions, and aggregation rules. This segmentation allows the system to handle complex 32-antenna port configurations by breaking down the overall configuration into manageable sub-configurations that can be processed independently, thereby improving measurement capability while controlling system complexity.
2Adaptability or versatility
If flexible RE patterns are used for CSI-RS transmission, then adaptability to different MIMO configurations is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic RE pattern configuration where the resource element patterns can be flexibly adjusted based on the specific MIMO configuration requirements. The system allows different CDM group sizes and component RE patterns to be selected and aggregated dynamically, enabling adaptation to various antenna port configurations while maintaining manageable processing complexity through standardized aggregation rules.
3Productivity
If CDM with size 8 is implemented for CSI-RS multiplexing, then resource utilization efficiency is improved, but detection and measurement difficulty increases
Solution Approach 1:
The patent applies segmentation by dividing the CDM-8 multiplexed signal into distinct CDM groups with unique identifiers. Each CDM group contains specific antenna ports that are multiplexed using code division, but the group structure allows the receiving device to separately identify and process each group, reducing the difficulty of detection and measurement while maintaining the resource utilization efficiency of CDM-8 multiplexing.
Data Source
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AI summary
Technology for a Next Generation NodeB (gNB) operable to communicate a channel state information reference signal (CSI-RS) resource element (RE) mapping configuration to a user equipment (UE) is disclosed. The gNB can determine a CSI-RS RE mapping configuration that 5 identifies resource elements for a CSI-RS resource at a frequency domain location (k) and at a time domain location (l). The gNB can encode the CSI-RS RE mapping configuration for transmission to the UE via higher layer signaling.